Zeitschriftenartikel: „Clogging behavior“

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Zhou, Bo, Di Wang, Tianzhi Wang und Yunkai Li. „Chemical Clogging Behavior in Drip Irrigation Systems Using Reclaimed Water“. Transactions of the ASABE 61, Nr. 5 (2018): 1667–75. http://dx.doi.org/10.13031/trans.12902.

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Abstract. Reusing reclaimed water in agricultural irrigation has become an effective way to alleviate water shortages in agriculture. However, the multiple substances in reclaimed water and their coupling effects easily lead to emitter clogging when using drip irrigation technology. The microorganisms present in reclaimed effluents secrete extracellular substances and absorb large amounts of solid particles, ions, nutrients, and organic matter and thus become the main part of the clogging substance. Meanwhile, traditional drip irrigation systems converted from irrigation to both irrigation and fertilization and the water-fertilizer coupling effects result in more chemical precipitation. Determining whether the chemical process has a significant impact on clogging and understanding the mechanism of this process was considered a difficult and important research question. For this reason, an indoor experiment, under a controllable environment, for drip irrigation emitter clogging using both reclaimed water with three Ca2++Mg2+ concentrations and groundwater was carried out. Several precise testing methods, such as x-ray diffraction, were applied to identify the mineral components in the clogging substances, and their characteristics and impacts on clogging were systematically explored. The results indicated that the emitter clogging characteristics were coincident under different treatments when using reclaimed water, and chemical precipitates were found in all treatments. Higher Ca2++Mg2+ concentrations led to more serious emitter clogging. The discharge ratio variation and Christiansen coefficient of uniformity for the reclaimed water treatments were lower than those for the groundwater treatment. Meanwhile, the total weights of the clogging substances were 5.6% to 58.8% higher. There were sufficient mineral components in the clogging substances, and they were identified as quartz, silicate, carbonate, and salt. Their contents all showed significant linear correlations with the degree of emitter clogging (R2 > 0.64, p < 0.05), which indicated that mineral components increased as the system continued operation. Among them, salt and silicate were linearly correlated to quartz contents, as they mainly originated from the water used for drip irrigation. However, carbonate contents increased in an exponential pattern with quartz contents (R2 > 0.67, p < 0.01), which demonstrated that carbonate was the main mineral component formed during the clogging process and the key component that increased clogging. The results obtained in this study provided insights into the chemical clogging process and the targeted chemical precipitates to be dealt with when using reclaimed water for drip irrigation. Keywords: Chemical precipitation, Emitter, Microirrigation clogging, Reclaimed water application.

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Jung, Jongwon, Hongsig Kang, Shuang Cindy Cao, Riyadh I. Al-Raoush, Khalid Alshibli und Joo Yong Lee. „Effects of Fine-Grained Particles’ Migration and Clogging in Porous Media on Gas Production from Hydrate-Bearing Sediments“. Geofluids 2019 (23.05.2019): 1–11. http://dx.doi.org/10.1155/2019/5061216.

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The migration of fine particles in porous media has been studied for different applications, including gas production from hydrate-bearing sediments. The clogging behavior of fine particles is affected by fine particle-pore throat size ratio, fine particle concentration, ionic concentration of fluids, and single/multiphase fluid flow. While previous studies presented valuable results, the data are not enough to cover a broad range of particle types and sizes and pore throat size in natural hydrate-bearing sediments. This paper presents a novel micromodel to investigate the effects of fine particle-pore throat size ratio, fine concentration, ionic concentration of fluid, and single/multiphase fluid flow on clogging or bridging in porous media. The results show that (1) the concentration of fine particles required to form clogging and/or bridging in pores decreased with the decrease in fine particle-pore throat size ratio, (2) the effects of ionic concentration of fluid on clogging behaviors depend on the types of fine particles, and (3) fine particles prefer to accumulate along the deionized water- (DW-) CO2 interface and migrate together, which in turn easily causes clogging in pores. As a result, multiphase fluid flow during gas production from hydrate-bearing sediments could easily develop clogging in pore throats, where the relative permeability of DW-CO2 in porous media decreases. Accordingly, the relatively permeability of porous media should be evaluated by considering the clogging behavior of fines.

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Liu, Yingchao, Jingbin Wang, Yanjun Liu, Lihong Li, Heng Zhou und Xuefeng She. „CFD-DEM simulation of powders clogging in a packed bed with lateral inlet“. International Journal of Chemical Reactor Engineering 19, Nr. 3 (08.02.2021): 251–59. http://dx.doi.org/10.1515/ijcre-2020-0215.

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Abstract Clogging behavior of powder particles in packed bed is a longstanding engineering challenge in many industrial processes, of particular interests to ironmaking reactors. In this work, a CFD-DEM model was developed to investigate the powders clogging in a packed bed with lateral inlet. The flow and clogging of powders of varying gas velocities flowing through the packed bed were studied. The results showed that two kinds of clogging powders inside the porous can be observed. One is mainly due to mechanical interactions between powder particles, which can create arches on packed bed and stop the flow. When the powders form a bridge across the pore throat of the orifice, the bottleneck of void space becomes the starting point for blockage formation. The other represents a part of clogging powders which is due to drag force and friction between one small particle rolling very slowly on the surface of large particles whose spacing is close to the diameter of powders. The powders distribution, mechanical behavior and pressure drop were also discussed. The findings of this work provides a fundamental understanding on clogging behavior of powders in a packed bed with lateral inlet, and is useful for industry processes’ understanding and optimization.

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Guo, Wei, Xuedong Guo, Xing Chen, Yingsong Li, Zhun Li, Yin An und Wenting Dai. „Laboratory Evaluation of the Permeability Durability of Utilization of Oil Shale Waste as Fine Aggregate in Open Grade Friction Course in Seasonal Frozen Regions“. Applied Sciences 10, Nr. 1 (06.01.2020): 419. http://dx.doi.org/10.3390/app10010419.

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Open graded friction course (OGFC), as a highly permeable mixture, has the characteristics of good friction and splash-and-spray reduction during rainstorms. The limitations of the use of such mixtures include the fact that they are affected by poor durability, including strength and permeability durability issues. In a previous study, oil shale waste, as a fine aggregate in the mixture (with a particle size less than 4.75 mm), could effectively improve the overall properties of OGFC, but the permeability durability was not clear. Thus, a comprehensive investigation of the permeability durability of oil shale waste as a fine aggregate is essential to achieving a better understanding in order to promote its engineering application. In this paper, the long-term permeability when using oil shale waste as a fine aggregate in OGFC was systematically investigated based on a self-developed laboratory physical clogging procedure. The test results illustrated the effectiveness of the utilization of oil shale waste as a fine aggregate in terms of permeability durability. A comprehensive index of the clogging coefficient containing mass, porosity and permeability coefficient was proposed based on gray relation entropy theory, the physical clogging model of COF-OGFC (OGFC containing oil shale waste filler) was established and the clogging speed of COF-OGFC was quantified based on the Mistcherlich growth model. The analysis showed that there is an essential difference in the clogging behavior of permeable pavement in the spring and summer. The maximum clogging degree of the permeable pavement in summer is about 40% higher than that in spring, while the clogging rate is much lower than in the spring, at only about 14%, which indicates that the clogging behavior of permeable asphalt pavement in spring is mostly in the rapid clogging mode, and that in summer is mostly in a slow deposition clogging mode. Moreover, the test results showed that the most important influences on the spring clogging behavior of COF-OGFC were the sandy clogging materials and particle sizes ranging from 150 μm to 1180 μm, which can be used to provide a reference for the design of anti-slip sand.

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Lu, Guoyang, Zijian He, Pengfei Liu, Zhihao He, Gaoyang Li, Hao Jiang und Markus Oeser. „Estimation of Hydraulic Properties in Permeable Pavement Subjected to Clogging Simulation“. Advances in Civil Engineering 2022 (21.01.2022): 1–13. http://dx.doi.org/10.1155/2022/5091895.

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Permeable pavements are often affected by pore clogging, which leads to their functional failure and reduced service life. However, the clogging mechanism and its impact on the permeability and complex pore microstructures in pervious pavement remain unclear. The aim of current study is to quantify the clogging behavior in pervious pavement materials and carry out investigations on the development of pore characteristics and permeability. Novel polyurethane-bound pervious mixture (PUPM) was adopted for comparative study in present research with conventional Porous Asphalt (PA). The Aachen Polishing Machine (APM) was selected to perfectly serve as a simulator for clogging process of pavement in the actual service condition. The permeability and pore microstructure of the pervious pavement material were then characterized by using the self-developed permeameter and X-ray Computed Tomography (CT) scanning, respectively. The development of pore characteristics in terms of clogging was experimentally illustrated. Based on the pore characteristics, the flow behavior of PUPM subjected to different clogging periods was predicted based on the developed non-Darcy flow model. The developed experiments and analysis can further strengthen the understanding of the clogging mechanism within the porous pavement material. The results can also serve for the optimization of the pervious pavement design in the engineering application.

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Muehlbauer, Jeffrey D., Theodore A. Kennedy, Adam J. Copp und Thomas A. Sabol. „Deleterious effects of net clogging on the quantification of stream drift“. Canadian Journal of Fisheries and Aquatic Sciences 74, Nr. 7 (Juli 2017): 1041–48. http://dx.doi.org/10.1139/cjfas-2016-0365.

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Drift studies are central to stream and river ecological research. However, a fundamental aspect of quantifying drift — how net clogging affects the accuracy of results — has been widely ignored. Utilizing approaches from plankton and suspended sediment studies in oceanography and hydrology, we examined the rate and dynamics of net clogging across a range of conditions. We found that nets clog nonlinearly over time and that suspended solid concentrations and net mesh size exerted a strong effect on clogging rates. Critically, net clogging introduced unpredictable biases in resultant data due to the inaccuracies in water volume estimates introduced by progressive clogging. This renders the widespread approach to linearly “correct” for clogging inadequate. Using a meta-analysis of 77 drift studies spanning 25 years, we demonstrate that the detrimental effects of net clogging are routinely unappreciated, even though the results of most of these studies were likely affected by clogging. We close by describing an approach for avoiding net clogging, which will increase the accuracy and reproducibility of results in future freshwater, lotic drift studies.

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Alimohammadi, Hossein, Kristina Vassiljeva, Eduard Petlenkov, Martin Thalfeldt, Alo Mikola, Tuule Mall Kull und Ahmet Köse. „Gray Box Time Variant Clogging behaviour and Pressure Drop Prediction of the Air Filter in the HVAC System“. E3S Web of Conferences 246 (2021): 10002. http://dx.doi.org/10.1051/e3sconf/202124610002.

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Identification and prediction of clogging behavior in heating, ventilation, and air conditioning (HVAC) filters is crucial to avoid issues such as system overheating, energy waste, lower indoor air quality, etc. Researchers are focusing more on the particle loading characteristics of a filter medium in a laboratory environment under steady-state conditions, fixed particle concentrations, area of porosity, dust feed and volumetric flow rate. However, recent research still shows uncertainties in modeling as well as the implementation problems of constructing the HVAC laboratory test bench and equipment. In addition, subjects such as non-uniform particle deposition depreciation of the condition and various type of mechanical filters such as fibrous, fabric, granular, and membrane filter or electrostatic filters which typically used in HVAC systems perform under some assumptions and still need more research. The studies become even more difficult acquiring a large number of time-varying and noisy signals. Another approach among studies is data-driven knowing that Building Automation System (BAS) is not equipped with appropriate sensor measuring the clogging, it is needed to drive the clogging mathematical model from the pressure drop signal. This paper bridges the gap between particle-size study and black box modeling of HVAC filter which has not received much attention from authors. The proposed method assumes that the pressure drop is the result of two time-varying functions; f(t), which represents the dynamics of clogging and, g(t), which refers to dynamics of remained terms. The exponential and polynomial of second order functions are proposed to express the clogging behavior. The software package based on Particle Swarm Optimization Artificial Bee Colony (PSOABC) algorithm, is developed and implemented to estimate the coefficients of the clogging functions based on smallest RMSE, high coefficient of correlation and acceptable tracking. Five Air Handling Unit (AHUs) are selected for practical verification of the model and the results show that the applied method can successfully predict clogging and pressure drop behaviour of HVAC filters.

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Licciardello, Feliciana, Alessandro Sacco, Salvatore Barbagallo, Delia Ventura und Giuseppe Luigi Cirelli. „Evaluation of Different Methods to Assess the Hydraulic Behavior in Horizontal Treatment Wetlands“. Water 12, Nr. 8 (14.08.2020): 2286. http://dx.doi.org/10.3390/w12082286.

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While there have been numerous studies on the rate and development of clogging in horizontal subsurface treatment wetlands (HSTWs) and, consequently, the effects on its hydraulic characteristics, research has not shown a clear understanding of the processes. The existing methods for measuring the impact of clogging provide limited information on the extension and degree of the phenomenon. This study aimed to evaluate the capacity of various measurement techniques to assess the degree and variation in space and time of clogging in HSTWs. Hydraulic conductivity at saturation (Ks) measurements were conducted using a newly implemented scheme, the drainage equation method, and traditional tracer tests, which were carried out in a full-scale HSTW system, located in Sicily, Italy, during 2019. After five years of operation, the results highlighted a severe decrease in Ks (<1000 m day−1) in the inlet zone (despite the fact that the filter gravel was replaced in 2017), a very high reduction of Ks along the central path inside the bed, a nonuniform flow through the HSTW, the presence of stagnant zones, and a reduction of the porosity of the bed gravel. Nonetheless, the mean values of the physical–chemical and bacteriological parameters at the hybrid treatment wetland (hybrid TW) outlet indicated that the partial clogging had no significant effect on the quality of the discharged water. Moreover, the results obtained using the different measurement techniques (in terms of both the Ks values and the flow distribution inside the bed) were consistent with each other and with results obtained previously for the same system. Finally, the most efficient combination of methods to assess clogging in HSTWs was identified.

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Zhu, Fei, Xiangping Wu, Yijun Lu und Jiandong Huang. „Understanding Penetration Attenuation of Permeable Concrete: A Hybrid Artificial Intelligence Technique Based on Particle Swarm Optimization“. Buildings 14, Nr. 4 (21.04.2024): 1173. http://dx.doi.org/10.3390/buildings14041173.

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Permeable concrete is a type of porous concrete with the special function of water permeability, but the permeability of permeable concrete will decrease gradually due to the clogging behavior arising from the surrounding environment. To reliably characterize the clogging behavior of permeable concrete, particle swarm optimization (PSO) and random forest (RF) hybrid artificial intelligence techniques were developed in this study to predict the permeability coefficient of permeable concrete and optimize the aggregate mix ratio of permeable concrete. Firstly, a reliable database was collected and established to characterize the input and output variables for the machine learning. Then, PSO and 10-fold cross-validation were used to optimize the hyperparameters of the RF model using the training and testing datasets. Finally, the accuracy of the developed model was verified by comparing the predicted value with the actual value of the permeability coefficients (R = 0.978 and RMSE = 1.3638 for the training dataset; R = 0.9734 and RMSE = 2.3246 for the testing dataset). The proposed model can provide reliable predictions of the clogging behavior that permeable concrete may face and the trend of its development.

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Li, Weifu, Yi Wang, Weijian Wang, Ying Ren und Lifeng Zhang. „Dependence of the Clogging Possibility of the Submerged Entry Nozzle during Steel Continuous Casting Process on the Liquid Fraction of Non-Metallic Inclusions in the Molten Al-Killed Ca-Treated Steel“. Metals 10, Nr. 9 (08.09.2020): 1205. http://dx.doi.org/10.3390/met10091205.

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In the current study, the nozzle clogging behavior and inclusion composition in Al-killed Ca-treated steels were observed to investigate the relationship between the liquid fraction of non-metallic inclusions and the clogging possibility of the submerged entry nozzle. Clogging materials were mainly MgO-Al2O3 with less than 20% liquid phases, while most of the inclusions were full liquid CaO-Al2O3-MgO in tundish at the casting temperature. Thus, it was proposed that the nozzle clogging can be effectively avoided by modification of solid inclusions to partial liquid ones rather than full liquid ones. There was a critical value of liquid fraction of inclusions causing the nozzle clogging. A critical condition of the inclusion attachment on the nozzle wall was a function of cosθN−S+cosθI−S<0. With the increase of T.Ca content in steel, the evolution route of inclusions was solid MgO-Al2O3→liquid CaO-Al2O3-MgO→solid CaS and CaO. To avoid the clogging of the submerged entry nozzle (SEN) under the current casting condition, the appropriate T.Ca concentration range in Al-killed Ca-treated steels can be enlarged from the 100% liquid inclusion zone of 10–14 ppm to the 20% liquid inclusion zone of 4–38 ppm.

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KOSHIBA, Takashi, und Takehiro YAMAMOTO. „Clogging Behavior in Abrupt Contraction Flow of Particle Suspension“. Proceedings of the Fluids engineering conference 2019 (2019): OS7–11. http://dx.doi.org/10.1299/jsmefed.2019.os7-11.

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Maheshwari, Bal Krishna, und Deepak A. Gunjagi. „Filtration and Clogging Behavior of Geotextiles with Roorkee Soils“. Geotechnical and Geological Engineering 26, Nr. 1 (21.09.2007): 101–7. http://dx.doi.org/10.1007/s10706-007-9150-7.

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Sandoval, Gersson F. B., Isaac Galobardes, Andre Campos De Moura und Berenice M. Toralles. „Hydraulic behavior variation of pervious concrete due to clogging“. Case Studies in Construction Materials 13 (Dezember 2020): e00354. http://dx.doi.org/10.1016/j.cscm.2020.e00354.

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Liu, Jinhua, Yayun Zhang, Dujie Zhang, Fan Li, Hexiang Zhou, Chengyuan Xu und Weiji Wang. „Multi-Sized Granular Suspension Transport Modeling for the Control of Lost Circulation and Formation Damage in Fractured Oil and Gas Reservoirs“. Processes 11, Nr. 9 (25.08.2023): 2545. http://dx.doi.org/10.3390/pr11092545.

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Transport and retention of multi-sized suspended granules are common phenomena in fracture media of oil, gas and geothermal reservoirs. It can lead to severe permeability damage and productivity decline, which has a significant impact on the efficient development of underground resources. However, the granule transport and retention behaviors remain not well understood and quantified. The novel stochastic model is proposed for the multi-sized suspended granule transport in naturally fractured reservoirs accounting for granule retention and fracture clogging kinetics. A percolation fracture network is proposed considering fracture connectivity evolution during suspended granule transport. Granule retention and fracture clogging dynamics equations are proposed to account for incomplete fracture clogging by retained granules. The microscale stochastic model is allowed for upscaling to predict the multi-sized granule transport behavior in naturally fractured reservoirs. The model solution exhibits preferential plugging of fractures with sizes equal to or below the granule size. Multi-sized suspended granule shows great advantages over mono-sized suspended granule in the control of permeability damage induced by granule retention and fracture clogging. The retained granule concentration and permeability damage rate decrease with fracture network connectivity improvement. The experimental investigation on size-exclusion suspended granule flow has been performed. The model-based prediction of the retained granule concentration and permeability variation history shows good agreement with the experimental data, which verifies the developed model.

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Zhang, Tong, Tong Li, Jinlin Lu, Qi Guo und Jian Xu. „Microstructural Characterization of the Corrosion Product Deposit in the Flow-Accelerated Region in High-Temperature Water“. Crystals 12, Nr. 5 (23.05.2022): 749. http://dx.doi.org/10.3390/cryst12050749.

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The clogging behavior of the micro-orifice under a flow accelerated condition was investigated after 500 h of immersion in high-temperature water. The results indicated the residual area of the micro-orifice was reduced to one-third of its original size after 500 h of immersion due to the deposition of corrosion products. In this process, the clogging behavior of micro-orifice can be divided into three stages: the stable deposition stage, the quick recovery stage, and the dynamic equilibrium stage. The corrosion products were porous and consisted of many deposited particles. The process of particle deposition and removal was carried out simultaneously.

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Nassiri, Sina, Claudia Zapata und Nariman Mahabadi. „Evolution of Water Retention Characteristics in Bio-Geochemically Altered Unsaturated Soils: A Pore-Scale Study“. E3S Web of Conferences 382 (2023): 18004. http://dx.doi.org/10.1051/e3sconf/202338218004.

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Biogeochemical processes in subsurface can dramatically alter the behavior of multiphase fluid flow and the hydrodynamics of porous media by bio-clogging. There exist analytical solutions such as soilsuction – saturation equations which can be used to predict the water retention curve relations in unsaturated soils. However, due to the complexity of various biogeochemical products, their pore-scale behavior and their interplay with pore structure, such analytical solutions would not provide accurate predictions. In this study, a large database of pore-networks were generated by adjusting the statistical and spatial pore and tube size distribution of the networks resembling various levels of bio-clogging. Numerical simulations including the evolution of pore structure, water retention relationship, and air invasion dynamics during desaturationwere explored. The numerical simulations verified that local pore-clogging leads to the development of isolated pore clusters and impermeable zones. The evolution of impermeable zones results in the formation of preferential flow paths towards the mobile zones for the multiphase flow problems. Using parallel computation, the critical predictors of water retention curves in bio-clogged porous media are found.

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Rashiddel, Alireza, Fatemeh Amiri Ramsheh, Asma Ramesh, Daniel Dias und Mohsen Hajihassani. „Clogging Potential of Earth-Pressure Balance Shield Driven Tunnels“. Open Construction and Building Technology Journal 14, Nr. 1 (24.08.2020): 185–95. http://dx.doi.org/10.2174/1874836802014010185.

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Background: Nowadays, the construction of urban tunnels for rapid transportation in metropolises is necessary. Since these tunnels are excavated at low depths, they are often associated with different problems and hazards. Some of them can reduce the efficiency of the tunnel boring machines and sometimes will stop the project. Among these problems the clogging can cause problems at the cutter head, in the chamber, and in other sections where the material transference occurs. Objective: The main purpose of this paper is to evaluate and determine the risk of clogging in the tunneling boring machine in Line 6 of the Tehran Metro. It includes stations: Amirkabir, Shohada Square, Emam Hossein Square and Sayyadeh Shirazi. This phenomenon induces an adhesion of the shield with the soil, increasing the necessary shear forces and it can eventually leads to the project interruption. Methods: Due to the fact that the criterion for the behavior of fine soils against moisture is Atterberg Limits, therefore, Atterberg Limits and the water content were utilized. For this purpose, the new method proposed by Hollman and Thewes (2013) was used. In this study, in addition to the Atterberg limits, the amount of free water resulting from the machine and from the underground water inflow was included in the calculations. Results: It was found that the water content should be increased carefully as the soil is very sensitive to this parameter. An increase of 15% of the water content permits to reduce the risk of clogging. If the added free water amount 15%, the probability of clogging becomes high. Whereas, in case where the added free water amount reaches 20%, the risk of clogging decreases significantly. Conclusion: According to the performed assessments, it was found that critical areas for the clogging aspect are both the cutter head and the chamber. The sensitivity of the soil is very important to the free water amount. Therefore, due to the behavior of sticky and plastic of clay soils against increasing water, it is necessary to determine the percentage of allowable water used in mechanized excavation projects.

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Adachi, Vitor Yudi Góes, Joan Steven Flores Rodríguez, Mariana Ferreira Benessiuti Motta, Gabriel Orquizas Mattielo Pedroso, Luis Rogerio de Oliveira Hein und Emerson Felipe Félix. „Sediment Barriers’ Performance in the Laboratory: Evaluation of Clogging and Filtration Characteristics in Geotextiles Subjected to Discharge Cycles“. Water 16, Nr. 1 (27.12.2023): 107. http://dx.doi.org/10.3390/w16010107.

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This research aims to assess the clogging process of geotextiles within silt fences. For that purpose, the filtering efficiency, flow rate, and clogging of three geotextiles (GTX-1, GTX-2, and GTX-3) employing two distinct soils and under three sediment discharge cycles were investigated. The analysis adhered to the American standard D5141-11 and, as further analyses, qualitative and quantitative inspections were conducted through microscopic images of the materials. The results showed greater clogging of the nonwoven geotextile, GTX-1, with higher retention efficiency (approximately 100%) and better turbidity removal for both soils, equal to a reduction of around 94%. For GTX-2, a woven geotextile with a larger pore opening, less intense clogging and lower retention efficiency were observed after the third discharge; the average was 96% for both soils. GTX-3, a woven geotextile with a smaller apparent opening, exhibited a behavior similar to GTX-1: as the number of cycles increased, the material experienced more clogging and higher retention efficiency for soil 1 (approximately 98.5%). Based on these findings, it can be inferred that the discharge cycles impact the tested geotextiles in diverse ways and, therefore, the selection of the material should be contingent on project requirements.

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Tong, Zhao Xia, Lun Chen und Shao Peng Zhou. „Effects of Normal Pressure on the Clogging Behavior of Geotextile and Gap-Graded Soil Filtration Systems“. Advanced Materials Research 538-541 (Juni 2012): 2184–89. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.2184.

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The applied loads have a significant role on the filtration property of soil and geotextile systems. This paper investigates the effects of normal pressure on the clogging behavior of geotextile and gap-graded soil filtration systems. The experimental results show that the clogging potential increases as the normal pressure increases. And a critical value for the normal pressure may exist. When the applied normal pressure is less than the critical value, the normal pressure has significant effects on the filtration systems. However, when the applied normal pressure exceeds the critical value, effects of the normal pressure on the soil-geotextile filtration systems are minor.

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Li, Yang, Changgui Cheng, Minglei Yang, Zhixuan Dong und Zhengliang Xue. „Behavior Characteristics of Argon Bubbles on Inner Surface of Upper Tundish Nozzle during Argon Blowing Process“. Metals 8, Nr. 8 (30.07.2018): 590. http://dx.doi.org/10.3390/met8080590.

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During continuous casting of aluminum-killed steel, clogging of tundish nozzle frequently occurs, which seriously disrupts the normal casting sequences and deteriorates strand quality. Generally, argon blowing technology in the form of a stable and continuous argon film on the inner surface of the upper nozzle is employed to prevent the upper nozzle from clogging in the production. To explore the formation mechanism and influence factors of this argon film, a water model of the upper nozzle with blowing argon with a similarity ratio of 1:1 was built. The results show that the number of bubble chains increases gradually with increasing argon flow rate and casting speed, and the argon gas curtain appears at the bottom half of the upper nozzle. For a given argon flow rate, the velocity of argon gas bubbles increased gradually with increasing casting speed, and decreased gradually with increasing distance from the upper nozzle top. For a given casting speed, the average velocity of argon gas bubbles was largest at a distance from the upper nozzle top of 6 mm with argon flow rate of 150 L/h. The results could provide theoretical and technical basis for the optimization of blowing argon parameters in order to prevent the clogging of upper nozzle and improve strand quality.

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Khalid, Muhammad Hammad, und Yixian Zhou. „Study of Clogging Phenomenon for a Conical Hopper: The Influence of Particle Bed Height and Hopper Angle“. Science and Technology of Nuclear Installations 2021 (24.04.2021): 1–10. http://dx.doi.org/10.1155/2021/9993614.

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The granular flow is one of the principal issues for the design of pebble bed reactors. Particularly, the clogging phenomenon raises an important issue for pebble bed reactors. In this paper, we conduct experiments and discrete particle simulation of two-dimensional discharge granular flow from a conical hopper, to study the effect of the particle bed height h and hopper angle α on the clogging phenomenon. In general, the clogging probability J increases with height h and starts to saturate when h is larger than a critical value. The experimental result trends are supported by discrete simulations. To understand the underlying physical mechanism, we conduct discrete particle simulations for various h values, focusing on the following parameters: the statistical averaging of the volume fraction, velocity, and contact pressure of particles near the aperture during the discharge. We found that, among all relevant variables, the contact pressure of particles is the main cause of the increasement of J when h increases. An exponential law between the pebble bed h and clogging probability J has been established based on these observations and Janssen model. As for hopper angle α , J shows an almost constant behavior for any rise in α followed by a sudden regression at α = 75 ° . Surprisingly, the effect of α is most obvious for intermediate values of h , where we observe a sharp increasement of clogging probability. The same trend is observed in the two-dimensional discrete simulation results.

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Djaafri, Djamel Eddine, und Mohamed Salah Nouaouria. „An Experimental Study of the Frictional Behavior at the Interface Soil-Structure with Regards to Wall Friction Effect and Clogging Related to Surface Roughness Form“. Civil and Environmental Engineering 20, Nr. 1 (01.06.2024): 255–73. http://dx.doi.org/10.2478/cee-2024-0020.

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Abstract The interactions between soil-structure are largely governed by the shear strength at the soil-structure interface, particularly in situations involving large displacements, known as shear residual strength. This latter can be influenced by a range of factors, including normal stress, physical properties, surface roughness, wall friction. The main objective of this study is to investigate clogging related to surface roughness form, in addition to wall friction arises from consolidation. In order to investigate the impact of wall friction, experiments involving ring shear tests were carried out on kaolin. Four different consolidation durations were employed to induce varying settlements of the upper platen, while three distinct testing procedures, including single stage, multistage, and preshearing, were utilized. Additionally, different levels of surface roughness were incorporated to investigate the effect of clogging. The test results obtained from various testing procedures indicate that employing a single stage procedure with zero consolidation time is the most suitable approach for mitigating the influence of wall friction. For clogging effect, is dependent on the materials used, namely, the kaolin and the mixture, as well as, the interfaces involved.

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Prajapati, Yogesh K., Manabendra Pathak und Mohd Kaleem Khan. „Clogging behavior of an elongated bubble in uniform and diverging microchannel“. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, Nr. 11 (05.05.2015): 1861–75. http://dx.doi.org/10.1177/0954406215585365.

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A numerical investigation has been performed to make a comparative study of clogging and detachment behavior of an elongated bubble during adiabatic flow through a uniform and diverging cross-sectional microchannel. The adiabatic gas–liquid two-phase flow has been numerically solved using volume of fluid approach in a finite volume code. Simulations have been made to investigate the effects of wall wettability, surface tension, and flow velocity on the bubble dynamics for both the configurations of microchannel. The net pressure drop across the bubble in the diverging channel has been calculated analytically and the results have been compared with numerical results. In both types of channels, the bubble shape goes through a transient stage followed by a steady and stable shape. The change in bubble shape during transient phase depends on the surface wettability, flow velocity, and the confinement of the channels. The bubble attains the symmetrical shape earlier in diverging channel. The formation of liquid film between the bubble and the wall plays an important role in the clogging behavior and movement of the bubble. Wall wettability has less impact on the pressure drop characteristics in the diverging channel.

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Seybold, H. J., Izael A. Lima und Ascânio D. Araújo. „The critical behavior of the clogging process in a porous medium“. Physics of Fluids 33, Nr. 9 (September 2021): 093609. http://dx.doi.org/10.1063/5.0064967.

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25

Cui, Heng, Yan-ping Bao, Min Wang und Wei-shuang Wu. „Clogging behavior of submerged entry nozzles for Ti-bearing IF steel“. International Journal of Minerals, Metallurgy, and Materials 17, Nr. 2 (April 2010): 154–58. http://dx.doi.org/10.1007/s12613-010-0206-y.

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26

Nguyen, Thanh Trung, und Buddhima Indraratna. „Micro-CT Scanning to Examine Soil Clogging Behavior of Natural Fiber Drains“. Journal of Geotechnical and Geoenvironmental Engineering 145, Nr. 9 (September 2019): 04019037. http://dx.doi.org/10.1061/(asce)gt.1943-5606.0002065.

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27

Kondo, Y., K. Miura, K. Miyagawa, M. Nohmi und T. Tsuneda. „Difference of clogging performance between radial and swept back impeller of axial pump“. Journal of Physics: Conference Series 2217, Nr. 1 (01.04.2022): 012025. http://dx.doi.org/10.1088/1742-6596/2217/1/012025.

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Abstract An axial pump which is used to pump water out of a river often sucks in solid bodies such as leaves and branches. These foreign substances may clog the passage and lead to dangerous conditions such as a decline in the performance of the pump. In this investigation, we conducted the clogging experiments by putting polyester strings in an axial drain pump which has two types of impellers, a radial blade impeller and a swept back blade impeller. By visualizing behavior of the strings in the pump using a high-speed video camera, we compared the anti-clogging performance between the two impellers and investigated the mechanism of clogging. The results of these experiments showed that the pass rate of the strings that flowed into the swept back blade impeller was higher than that in the radial blade impeller. It is because strings that are caught in the leading edge of the swept back blade tend to move to the tip side and be pulled towards the suction surface. In addition to the experiments, we carried out the simulations of these experiments using a CFD-DEM (Discrete Element Method) coupling analysis. The results were in good agreement with the experiments qualitatively.

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Hua, Chengjian, Min Wang, Dieter Senk, Hao Wang, Qi Zhang, Jianguo Zhi und Yanping Bao. „Cone Clogging of Submerged Entry Nozzle in Rare Earth Treated Ultra-Low Carbon Al-Killed Steel and Its Effect on the Flow Field and Vortex in the Mold“. Metals 11, Nr. 4 (19.04.2021): 662. http://dx.doi.org/10.3390/met11040662.

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Two submerged entry nozzles (SENs) used for casting 1300 tons and 260 tons of Al-killed steel were dissected. Several parameters including block rate, nozzle clog angle, port width, and port height of the clogged nozzle were introduced to describe the geometry of clogs in the SENs based on the dissection; furthermore, a geometry model was established to describe the characteristics of the nozzle clogging of the SENs. A large-eddy simulation (LES) coupled with the volume of fraction (VOF) method was adopted to simulate the steel–slag interface’s interaction behavior. The vortex visualization and rotation magnitude were characterized by the Liutex method. Quantitatively, the influence of nozzle clogging resulted in block rates of 0% to 45.9% on the flow and vortex distribution in the mold, and the characteristics of the steel–slag interface fluctuation were well verified in the industrial experiment.

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Huang, Jiandong, Jia Zhang und Yuan Gao. „Evaluating the Clogging Behavior of Pervious Concrete (PC) Using the Machine Learning Techniques“. Computer Modeling in Engineering & Sciences 130, Nr. 2 (2022): 805–21. http://dx.doi.org/10.32604/cmes.2022.017792.

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Karlsen, Haakon, und Tao Dong. „A Pressure Driven Nanoconcentrator with Anti-Clogging Behavior for Recovery of Bio-Nanoparticles“. Chemical Engineering Communications 202, Nr. 6 (22.01.2015): 718–27. http://dx.doi.org/10.1080/00986445.2013.867262.

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31

Hwang, Euichul, Gyuyong Kim, Gyeongcheol Choe, Minho Yoon, Minjae Son, Dongkyun Suh, Hamin Eu und Jeongsoo Nam. „Explosive Spalling Behavior of Single-Sided Heated Concrete According to Compressive Strength and Heating Rate“. Materials 14, Nr. 20 (13.10.2021): 6023. http://dx.doi.org/10.3390/ma14206023.

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In this study, the effects of heating rate and compressive strength on the spalling behavior of single-sided heated ring-restrained concrete with compressive strengths of 60 and 100 MPa were investigated. The vapor pressure and restrained stress inside the concrete were evaluated under fast- and slow-heating conditions. Regardless of the heating rate, the concrete vapor pressure and restrained stress increased as the temperature increased, and it was confirmed that spalling occurred in the 100-MPa concrete. Specifically, it was found that moisture migration and restrained stress inside the concrete varied depending on the heating rate. Under fast heating, moisture clogging and restrained stress occurred across the concrete surface, causing continuous surface spalling for the 100-MPa concrete. Under slow heating, moisture clogging occurred, and restrained stress continuously increased in the deep area of the concrete cross-section owing to the small internal temperature difference, resulting in explosive spalling for the 100-MPa concrete with a dense internal structure. Additionally, while the tensile strength of concrete is reduced by heating, stress in the heated surface direction is generated by restrained stress. The combination of stress in the heated concrete surface and the internal vapor pressure generates spalling. The experimental results confirm that heating rate has a significant influence on moisture migration and restrained stress occurrence inside concrete, which are important factors that determine the type of spalling.

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Lee, Dal-Won, und Jae-Jin Noh. „Clogging behavior of recycled aggregates and crushed stone as horizontal drains in soft ground“. Korean Journal of Agricultural Science 40, Nr. 3 (30.09.2013): 253–60. http://dx.doi.org/10.7744/cnujas.2013.40.3.253.

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Bringedal, Carina, und Kundan Kumar. „Effective Behavior Near Clogging in Upscaled Equations for Non-isothermal Reactive Porous Media Flow“. Transport in Porous Media 120, Nr. 3 (09.10.2017): 553–77. http://dx.doi.org/10.1007/s11242-017-0940-y.

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Yang, Jingyu, Yinchuan Guo, Vivian W. Y. Tam, Jingjing Tan, Aiqin Shen, Jianfeng Zhang, Chong Zhang und Zhenghua Lyu. „Research on pore-clogging behavior and mechanism in pervious concrete prepared with recycled aggregate“. Construction and Building Materials 384 (Juni 2023): 131420. http://dx.doi.org/10.1016/j.conbuildmat.2023.131420.

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35

Shuaib, Mohammed, und Zarita Zainuddin. „Incorporating Intelligence for Overtaking Moving Threatening Obstacles“. International Arab Journal of Information Technology 17, Nr. 4A (30.07.2020): 598–606. http://dx.doi.org/10.34028/iajit/17/4a/3.

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Crowd management and fire safety studies indicate that the correct prediction of the threat caused by fire is crucial behavior which could lead to survival. Incorporating intelligence into exit choice models for accomplishing evacuation simulations involving such behavior is essential. Escaping from moving source of panic such as fire is of tremendous frightening event while evacuation situation. Predicting the dynamic of fire spreading and the exit clogging are intelligent aspects which help the individuals follow the correct behaviors for their evacuation. This article proposes an intelligent approach to accomplishing typical evacuations. The agents are provided with the ability to find optimal routes that enable them overcome spreading fire. Fire and safe floor fields are proposed to provide the agents with the capability of determining intermediate points to compose optimal routes toward the effective chosen exit. The instinct human behavior of being far from the fire to protect himself from sudden unexpected attack is introduced as essential factor risen in emergency situation. Simulations are conducted in order to examine the simulated evacuees’ behavior regarding overtaking the fire and to test the efficiency of making smart and effective decisions during emergency evacuation scenarios

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Lim, J. „Hagfish slime ecomechanics: testing the gill-clogging hypothesis“. Journal of Experimental Biology 209, Nr. 4 (15.02.2006): 702–10. http://dx.doi.org/10.1242/jeb.02067.

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37

Goto, Y. „Behavior of nuisance mussel, Limnoperna fortunei, in water supply facilities“. Water Science and Technology 46, Nr. 11-12 (01.12.2002): 45–50. http://dx.doi.org/10.2166/wst.2002.0715.

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Limnoperna fortunei, a species of bivalve of foreign origin, was confirmed to exist in Japan for the first time in 1992. It was found in some facilities of Hanshin Water Supply Authority in 1994. Later, it was found to cause various problems such as clogging of sampling pipes. Following this finding, research was initiated to investigate the possibility of its causing major incidents of bio-fouling such as total blockage of water passage by adhering to the raw water transmission pipe wall in massive numbers. As a result, it was found that Limnoperna fortunei was spawned in summer and grew up to 20 mm in size by the end of a one-year period when it began to die out and became detached immediately. Therefore, it was concluded that no deliberate efforts to remove them are required to avoid major problems

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Wu, Mingzhuang, Fei Chen, Aimin Li und Guanzhong Sun. „Study on flow behavior of fresh concrete in elbow using the dense discrete phase approach“. Journal of Physics: Conference Series 2756, Nr. 1 (01.05.2024): 012029. http://dx.doi.org/10.1088/1742-6596/2756/1/012029.

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Abstract The presence of an elbow in the pipe during pumping can cause serious problems such as separation and clogging of the concrete. It is difficult to accurately and intuitively observe the internal information of the pump tube. This work used the Dense Discrete Phase Model (DDPM) to investigate the flow behavior of fresh concrete in the elbow. Firstly, the accuracy of the simulation model is verified. Then, the DDPM is used to research the flow behavior of fresh concrete in the elbow at different inlet velocities, and the changing rules of flow velocity, pressure loss, and particle migration are revealed. This work provides a solution to ensure the normal pumping process and effectively predict the pump pressure loss.

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Barba, J., M. Lapuerta, F. Cardeño und JJ Hernández. „Are Cold Filter Plugging Point and Cloud Point reliable enough to prevent cold-start operability problems in vehicles using biodiesel blends?“ Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 234, Nr. 9 (02.05.2020): 2305–11. http://dx.doi.org/10.1177/0954407020915101.

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Despite being subjected to tight sustainability restrictions in the last decade (Directives 2009-28-CE, 2015-1513-CE, and EU-2018-2001), the use of biodiesel in compression ignition engines is still increasing in the European Union. As known, one of the main drawbacks of biodiesel is cold flow behavior, along with oxidation stability problems. According to European standards, the Cold Filter Plugging Point and Cloud Point methods are the ones used to ensure diesel vehicle operability in temperate and arctic climates, respectively, within the EU. Despite the existing standards, several issues related to startability have occurred in the northern European countries due to filter clogging. In this frame, this study checks the reliability of the conventional Cold Filter Plugging Point and Cloud Point tests by comparing their results with those coming from an experimental rig that simulates the low-pressure fuel circuit of a diesel vehicle. Baseline diesel was blended with two biodiesel fuels (7% and 10% by volume) produced from palm oil. Regardless of the fuel used and the blend (B7 or B10), Cold Filter Plugging Point and Cloud Point methods underestimate the temperature at which the filter clogging occurs compared to real conditions, these differences being as significant as 4°C when compared to Cold Filter Plugging Point and Cloud Point, respectively. Results obtained encourage either searching for more reliable standards to quantify the cold flow behavior of biodiesel fuels or limiting the maximum content of the main compounds causing cold-start problems.

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Hoffmeister, Hans Werner, und Ronald Wittmer. „Development and Test of CVD-Diamond Microgrinding Wheels“. Key Engineering Materials 447-448 (September 2010): 131–35. http://dx.doi.org/10.4028/www.scientific.net/kem.447-448.131.

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CVD-diamond microgrinding wheels can be used in the microsystems technology, e.g. to produce microarrays consisting of glass. These novel tools have the same advantages as CVD-diamond microgrinding pins, but they can even be used with higher cutting velocities and higher material removal rates. Furthermore, micro cracks and chipping could be minimized and better surface qualities could be achieved. The tool body consists of cemented carbide. After designing a suitable geometry for these novel micro grinding tools, they had to be produced with cup wheels. The design, which has already been tested, is a grinding wheel of the type “1A1”. The CVD-diamond microgrinding wheels were analyzed with a scanning electron microscope (SEM) due to their topography and crystallite size. The microgrinding wheels were tested with regard to their grinding behavior. During the investigations, cutting forces were measured and afterwards analyzed. In addition, surface roughnesses were measured, so that the materials could be compared with regard to their grindability. The tool wear was evaluated by means of SEM-pictures. They showed the wear resisting behavior of the CVD-diamond microgrinding wheels. Even after grinding a high material removal rate in the hard ceramic aluminum nitride, only a small clogging of the microgrinding wheel was monitored. The slight increase of the cutting force is another indicator for the clogging. It can be summarized that novel grinding tools could be successfully developed and tested with hard and brittle materials. During these tests, the cutting forces and surface roughnesses as well as wear behavior and end of tool life were determined and will be shown in this publication.

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Lian, Liping, Xu Mai, Weiguo Song, Jun Zhang, Kwok Kit Richard Yuen und Eric Wai Ming Lee. „Characteristics of merging behavior in large crowds“. Journal of Statistical Mechanics: Theory and Experiment 2022, Nr. 1 (01.01.2022): 013403. http://dx.doi.org/10.1088/1742-5468/ac42cb.

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Abstract Merging pedestrian flow can be observed often at public intersections and locations where two or more channels merge. Because of restrictions on the flow, pedestrian congestion, or even crowd disasters (e.g. Hajj crush 2015) happen easily at these junctions. However, studies on merging behaviors in large crowds remain rare. This paper investigates the merging characteristics of the pedestrian flow with controlled experiments under laboratory conditions. The formation of lanes is observed, and the lane separation width can vary for different density levels. Shannon entropy is used to analyze the utilization of the passage. The space usage in the merging area is most efficient when the width of the two branches is half that of the main corridor. Furthermore, the branch and main channel can mutually bottleneck each other in the large crowds and the flowrates for the upstream, downstream and branches are investigated. This study uses spatiotemporal diagrams to explore the clogging propagation of the merging flow as well as the relationship of the velocity and position. The results can be used as references for the design of public infrastructure and human safety management.

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Sampedro, Gabriel Avelino R., Danielle Jaye S. Agron, Gabriel Chukwunonso Amaizu, Dong-Seong Kim und Jae-Min Lee. „Design of an In-Process Quality Monitoring Strategy for FDM-Type 3D Printer Using Deep Learning“. Applied Sciences 12, Nr. 17 (31.08.2022): 8753. http://dx.doi.org/10.3390/app12178753.

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Additive manufacturing is one of the rising manufacturing technologies in the future; however, due to its operational mechanism, printing failures are still prominent, leading to waste of both time and resources. The development of a real-time process monitoring system with the ability to properly forecast anomalous behaviors within fused deposition modeling (FDM) additive manufacturing is proposed as a solution to the particular problem of nozzle clogging. A set of collaborative sensors is used to accumulate time-series data and its processing into the proposed machine learning algorithm. The multi-head encoder–decoder temporal convolutional network (MH-ED-TCN) extracts features from data, interprets its effect on the different processes which occur during an operational printing cycle, and classifies the normal manufacturing operation from the malfunctioning operation. The tests performed yielded a 97.2% accuracy in anticipating the future behavior of a 3D printer.

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Yang, Mengyao, Mingzhi Lu, Hongfeng Bian, Lianxi Sheng und Chunguang He. „Effects of clogging on hydraulic behavior in a vertical-flow constructed wetland system: A modelling approach“. Ecological Engineering 109 (Dezember 2017): 41–47. http://dx.doi.org/10.1016/j.ecoleng.2017.09.010.

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Wang, Xudong, Bo Zhang, Jinsheng Lv und Shuo Yin. „Investigation on the Clogging Behavior and Additional Wall Cooling for the Axial-Injection Cold Spray Nozzle“. Journal of Thermal Spray Technology 24, Nr. 4 (25.02.2015): 696–701. http://dx.doi.org/10.1007/s11666-015-0227-1.

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45

Wullenweber, Maike S., Jonathan Kottmeier, Ingo Kampen, Andreas Dietzel und Arno Kwade. „Simulative Investigation of Different DLD Microsystem Designs with Increased Reynolds Numbers Using a Two-Way Coupled IBM-CFD/6-DOF Approach“. Processes 10, Nr. 2 (18.02.2022): 403. http://dx.doi.org/10.3390/pr10020403.

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Deterministic lateral displacement (DLD) microsystems are suitable for the size fractionation of particle suspensions in the size range of 0.1 to 10 µm. To be able to fractionate real particles beyond a laboratory scale, these systems have to be designed for higher throughputs. High flow resistances and increasing the clogging of the systems impose substantial challenges for industrial operation. Simulative parameter studies are suitable for improving the design of the systems; for example, the position and shape of the posts. A high-resolution, two-way coupled 6-DOF CFD-DEM approach was used to study the flow and particle behavior of different post shapes (circular and triangular) and post sizes at different Reynolds numbers. The results were compared with the classical first streamline width theory. It was shown that the streamline theory does not account for all effects responsible for the separation. Furthermore, a shift in the critical particle diameter to smaller values could be obtained when increasing the Reynolds number and also when using triangular posts with reduced post sizes compared to the post spacing. These findings can help to improve the efficiency of the systems as the post spacing could be extended, thus reducing the flow resistance and the probability of clogging.

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Childers, Carl C., Stephen H. Futch und Lionel A. Stange. „Insect (Neuroptera: Lepidoptera) Clogging of a Microsprinkler Irrigation System in Florida Citrus“. Florida Entomologist 75, Nr. 4 (Dezember 1992): 601. http://dx.doi.org/10.2307/3496143.

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Zhan, Yijian, Jian Gong, Yulin Huang, Chong Shi, Zibo Zuo und Yiqun Chen. „Numerical Study on Concrete Pumping Behavior via Local Flow Simulation with Discrete Element Method“. Materials 12, Nr. 9 (30.04.2019): 1415. http://dx.doi.org/10.3390/ma12091415.

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The use of self-consolidating concrete and advanced pumping system enables efficient construction of super high-rise buildings; however, risks such as clogging or even bursting of pipeline still exist. To better understand the fresh concrete pumping mechanisms in detail, the discrete element method is employed in this paper for the numerical simulation of local pumping problems. By modeling the coarse aggregates as rigid clumps and appropriately defining the contact models, the concrete flow in representative pipeline units is well revealed. Important factors related to the pipe geometry, aggregate geometry and pumping condition were considered during a series of parametric studies. Based on the simulation results, their impact on the local pumping performance is summarized. The present work demonstrates that the discrete element simulation offers a useful way to evaluate the influence of various parameters on the pumpability of fresh concrete.

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Wang, Qian, Feng Liu und Qiyong Xu. „Insight into the effect of calcium on bio-clogging behavior via quartz crystal microbalance with dissipation monitoring“. Chemosphere 292 (April 2022): 133547. http://dx.doi.org/10.1016/j.chemosphere.2022.133547.

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49

Yazdandoust, Majid, und Amin Bastami. „Pre-and post-cyclic behavior of soft ground improved by geogrid-encased granular columns considering clogging effect“. Construction and Building Materials 426 (Mai 2024): 134149. http://dx.doi.org/10.1016/j.conbuildmat.2023.134149.

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50

Zhang, Jie, Qingsong Zhuo, Qian Zheng, Bin Wang, Mingang Zhang, Xiaoyu Zhao, Jigang Geng, Xiaoshi Li und Ruoyu Bao. „Study on the corrosion behavior and mechanical response of weakly cemented sandstone in alkaline solutions“. PLOS ONE 19, Nr. 9 (04.09.2024): e0309544. http://dx.doi.org/10.1371/journal.pone.0309544.

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This study examines the corrosion characteristics of weakly cemented sandstone under alkaline conditions, evaluating the effects of varying pH levels on its macroscopic degradation, micro-porosity, and mechanical properties, notably uniaxial compressive strength. Findings reveal that heightened alkalinity exacerbates rock damage, although a temporary alleviation in mass loss occurs between pH 9 and 11 due to pore clogging by complexes formed from cations like Ca2+ and Mg2+.Increased alkalinity induces marked changes in pore features, with an observed rise in pore numbers, transformation of pore shapes from elongated to more spherical, and adjustments in porosity, pore size, and roundness. Furthermore, the study confirms a decline in both the rock’s compressive strength and elastic modulus as pH rises. These revelations shed light on the role of pH in the corrosion behavior of weakly cemented sandstone under alkaline conditions, providing a fresh perspective for understanding its corrosion mechanisms in such environments.

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