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Artykuły w czasopismach na temat „Hydrodynamic studies”

Autor: Grafiati

Data publikacji: 6 września 2023

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1

Florescu, Iulian, Daniela Florescu i Dragos Nedelcu. "Hydrodynamic Studies on Spherical Valve". Applied Mechanics and Materials 332 (lipiec 2013): 27–32. http://dx.doi.org/10.4028/www.scientific.net/amm.332.27.

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The paper emphasizes the theoretical aspects of spherical valve operation, the calculation of hydrodynamic parameters specific to this type of valve and a method of analysis of the influence of the main physical-mechanical parameters of flow simulations using specialized software. It may reveal such power distribution lines for different opening angles of the valve and pressure distribution along the flow speed and hence can express losses coefficients and flow coefficients. Areas with whirlpools and a large cluster of vortex lines characterize significant losses of hydraulic energy along the flow and can lead to structural characteristics that provide optimal design of these valves.

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2

Hameed, MS, i DS Al-Mousilly. "Hydrodynamic studies in crossflow filtration". Filtration & Separation 38, nr 2 (marzec 2001): 34–39. http://dx.doi.org/10.1016/s0015-1882(01)80193-2.

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3

Blomquist, H. K., S. Sundin i J. Ekstedt. "Cerebrospinal fluid hydrodynamic studies in children." Journal of Neurology, Neurosurgery & Psychiatry 49, nr 5 (1.05.1986): 536–48. http://dx.doi.org/10.1136/jnnp.49.5.536.

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4

Wilhelm, A. M., J. P. Riba, G. Muratet, A. Peyrouset i R. Prechner. "Hydrodynamic studies in large-diameter columns". Journal of Chromatography A 363, nr 2 (styczeń 1986): 113–23. http://dx.doi.org/10.1016/s0021-9673(01)83731-6.

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5

Brereton, R. J. "Cerebrospinal fluid hydrodynamic studies in children". Journal of Pediatric Surgery 22, nr 5 (maj 1987): 469. http://dx.doi.org/10.1016/s0022-3468(87)80306-8.

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6

Schartmann, M., K. Meisenheimer, H. Klahr, M. Camenzind, S. Wolf, Th Henning, A. Burkert i M. Krause. "Hydrodynamic Studies of Turbulent AGN Tori". EAS Publications Series 44 (2010): 69–72. http://dx.doi.org/10.1051/eas/1044012.

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7

Suryawanshi, Pravin G., Vinay M. Bhandari, Laxmi Gayatri Sorokhaibam, Jayesh P. Ruparelia i Vivek V. Ranade. "Solvent degradation studies using hydrodynamic cavitation". Environmental Progress & Sustainable Energy 37, nr 1 (16.06.2017): 295–304. http://dx.doi.org/10.1002/ep.12674.

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8

Xue, Gang, Fagang Bai, Zhitong Li i Yanjun Liu. "Experiment for Effect of Attack Angle and Environmental Condition on Hydrodynamics of Near-Surface Swimming Fish-Like Robot". Applied Bionics and Biomechanics 2023 (1.04.2023): 1–16. http://dx.doi.org/10.1155/2023/4377779.

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Fish-like robot is a special autonomous underwater vehicle with broad application prospects. Some previous studies concentrated on the hydrodynamics of free-swimming fish-like robots. But the hydrodynamic performance of fish-like robot swimming with a tilt angle in constrained space has not been well studied, and the influence of environmental wave and current on its is also still unclear. In this paper, the experiment devices, including a physical fish-like robot, a hydrodynamics measurement platform, and a six-axis force sensor, are used to study the effect of attack angle and environmental condition on the hydrodynamics of near-surface swimming fish-like robot. Nine attack angles, five oscillating amplitudes, and three environmental conditions are analyzed in the experiments. It shows that thrust force decreases when caudal fin passes above water surface, but the increased difference between gravity force and buoyancy force will compensate the decreased force generated by caudal fin when fish-like robot swims with certain dive angle. The extra reaction force generated by solid bottom boundary will promote the thrust force and vertical force. The surface water wave condition or surface water current condition also has obvious effects on hydrodynamic performance. This paper provides a new perspective to the research on the hydrodynamic performance of fish-like robot and will do favor in the development of fish-like robot.

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9

Chrzanowska, Agnieszka, i Pawel T. Jochym. "Microscopic Stress Tensor of Nematic Liquid Crystal Binary Mixtures". Zeitschrift für Naturforschung A 51, nr 3 (1.03.1996): 147–50. http://dx.doi.org/10.1515/zna-1996-0302.

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A microscopic stress tensor for the binary nematic mixture of anisotropic molecules is presented. Its simple additive character is beneficial for hydrodynamics studies. We pay attention to mixtures of disc and rodlike molecules which may exhibit interesting hydrodynamic properties.

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10

YAMAZAKI, Dai. "Constraints and funs of global hydrodynamic studies". JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES 34, nr 4 (5.07.2021): 256. http://dx.doi.org/10.3178/jjshwr.34.256.

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11

Rajar, Rudi, Matjaz Cetina i Andrej Sirca. "Hydrodynamic and water quality modelling: case studies". Ecological Modelling 101, nr 2-3 (sierpień 1997): 209–28. http://dx.doi.org/10.1016/s0304-3800(97)00052-5.

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12

Cölfen, H. "Hydrodynamic studies on chitosans in aqueous solution". Carbohydrate Polymers 45, nr 4 (sierpień 2001): 373–83. http://dx.doi.org/10.1016/s0144-8617(00)00269-1.

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13

Scheerhagen, M. A., H. van Amerongen, R. van Grondelle i Joh Blok. "Hydrodynamic studies of a DNA-protein complex". FEBS Letters 179, nr 2 (7.01.1985): 221–24. http://dx.doi.org/10.1016/0014-5793(85)80522-6.

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14

Scheerhagen, M. A., M. E. Kuil, R. van Grondelle i Joh Blok. "Hydrodynamic studies of a DNA-protein complex". FEBS Letters 184, nr 2 (20.05.1985): 221–25. http://dx.doi.org/10.1016/0014-5793(85)80610-4.

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15

Chi, Guoxiang, i Chunji Xue. "An overview of hydrodynamic studies of mineralization". Geoscience Frontiers 2, nr 3 (lipiec 2011): 423–38. http://dx.doi.org/10.1016/j.gsf.2011.05.001.

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16

Litvinov, Rustem I., Bulat Z. Idiyatullin, Dilyafruz R. Bakirova, Dzhigangir A. Faizullin, Rauf H. Kurbanov, John W. Weisel i Yuriy F. Zuev. "Fibrinogen Hydrodynamic Properties from NMR-Diffusion Studies". Biophysical Journal 108, nr 2 (styczeń 2015): 48a. http://dx.doi.org/10.1016/j.bpj.2014.11.295.

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17

Zhu, Feng, Ai Wu Cao i Geng Ying. "Characteristics Research of Aqueduct under FSI Dynamic Response". Advanced Materials Research 864-867 (grudzień 2013): 2367–70. http://dx.doi.org/10.4028/www.scientific.net/amr.864-867.2367.

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Maximum distribution of hydrodynamic pressure on the flume sidewall were studied in this paper based on the finite element method. It contains the difference comparison of theoretical and numerical formulas, rules of maximum hydrodynamic pressure distribution under regular and irregular incentives, and hydrodynamic pressure changes with different height of bracket below the aqueduct. Studies show that: In the 30m height range, with the rise of bracket, the hydrodynamic pressure grows linearly.

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18

Bellafiore, D., E. Bucchignani, S. Gualdi, S. Carniel, V. Djurdjeviæ i G. Umgiesser. "Evaluating meteorological climate model inputs to improve coastal hydrodynamic studies". Advances in Science and Research 6, nr 1 (22.08.2011): 227–31. http://dx.doi.org/10.5194/asr-6-227-2011.

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Abstract. This work compares meteorological results from different regional climate model (RCM) implementations in the Mediterranean area, with a focus on the northern Adriatic Sea. The need to use these datasets as atmospheric forcings (wind and atmospheric pressure fields) for coastal hydrodynamic models to assess future changes in the coastal hydrodynamics, is the basis of the presented analysis. It would allow the assessment of uncertainties due to atmospheric forcings in providing coastal current, surge and wave climate changes from future implementations of hydrodynamic models. Two regional climate models, with different spatial resolutions, downscaled from two different global climate models (whose atmospheric components are, respectively, ECHAM4 and ECHAM5), were considered. In particular, the RCM delivered wind and atmospheric pressure fields were compared with measurements at four stations along the Italian Adriatic coast. The analyses were conducted using a past control period, 1960–1990, and the A1B IPCC future scenario (2070–2100). The chosen scenario corresponds to a world of very rapid economic and demographic growth that peaks in mid-century, with a rapid introduction of new efficient technologies, which balance fossil and non-fossil resources (IPCC, 2007). Consideration is given to the accuracy of each model at reproducing the basic statistics and the trends. The role of models' spatial resolution in reproducing global and local scale meteorological processes is also discussed. The Adriatic Sea climate is affected by the orography that produces a strengthening of north-eastern katabatic winds like bora. Therefore, spatial model resolution, both for orography and for a better resolution of coastline (Cavaleri et al., 2010), is one of the important factors in providing more realistic wind forcings for future hydrodynamic models implementations. However, also the characteristics in RCM setup and parameterization can explain differences between the datasets. The analysis from an ensemble of model implementation would provide more robust indications on climatic wind and atmospheric pressure variations. The scenario-control comparison shows a general increase in the mean atmospheric pressure values while a decrease in mean wind speed and in extreme wind events is seen, particularly for the datasets with higher spatial resolution.

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19

Hirani, H., i P. Samanta. "Hybrid (hydrodynamic + permanent magnetic) journal bearings". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 221, nr 8 (1.08.2007): 881–91. http://dx.doi.org/10.1243/13506501jet282.

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Survey of patents on bearings indicates the maturity of hydrodynamic and rapid development of magnetic bearings. Active magnetic bearings are costlier compared with permanent magnetic bearings. To understand the performance characteristics of permanent magnetic bearings, an experimental setup has been developed. Experimental studies on radial permanent magnetic bearings demonstrated the drawbacks, such as high axial thrust and low load capacity. This has led the authors to hybridize the permanent magnet with hydrodynamic technology and to explore the possibility of achieving the low starting torque of a permanent magnetic bearing and the medium to high load carrying capacity of a hydrodynamic bearing in a single bearing arrangement. Simulation is carried out in order to reduce axial force-effect and enhance the radial force supported by the permanent magnetic bearing. Results of simulation on permanent magnetic bearing have been compared with that of published research papers. Finally an algorithm has been developed to investigate the coupling of forces generated by permanent magnets and hydrodynamic actions. Results of load sharing have been reported. The experimentally measured displacements of the shaft running at 500, 2000, and 3000 r/min have been plotted. The effect of hydrodynamics on shaft orbit has been illustrated.

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20

Lin, I. Chen, i C. C. Tung. "STUDIES OF TSUNAMI HAZARD". Coastal Engineering Proceedings 1, nr 20 (29.01.1986): 192. http://dx.doi.org/10.9753/icce.v20.192.

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Tsunami hazard is investigated using the indirect approach with simple seismological and hydrodynamic models. It is assumed that earthquakes of random magnitude may originate anywhere with equal likelihood from a single straight fault and the site is located on the perpendicular plane bisecting the fault. The ground displacement is instantaneous and consists of a block uplift type of movement which may be circular or elongated in the plan view. The hydrodynamic model is based on linear long wave theory wherein the ocean is of constant depth and infinite in the horizontal extent, and the earth is flat. Tsunami hazard is computed for various values of the parameters and a sensitivity study is carried out to examine the effect of certain parameters on hazard.

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21

M. de Abreu, Carlos, Maria Barros, Daímio Brito, Marcelo Teixeira i Alan Cunha. "Hydrodynamic Modeling and Simulation of Water Residence Time in the Estuary of the Lower Amazon River". Water 12, nr 3 (29.02.2020): 660. http://dx.doi.org/10.3390/w12030660.

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Studies about the hydrodynamic behavior in the lower Amazon River remain scarce, despite their relevance and complexity, and the Water Residence Time (Rt) of this Amazonian estuary remains poorly unknown. Therefore, the present study aims to numerically simulate three seasonal Rt scenarios based on a calibrated hydrodynamic numerical model (SisbaHiA) applied to a representative stretch of the lower Amazon River. The following methodological steps were performed: (a) establishing experimental water flow in natural channels; (b) statistically test numerical predictions (tidal range cycles for different hydrologic periods); and (c) simulating velocity fields and water discharge associated with Rt numerical outputs of the hydrodynamic model varied from 14 ≤ Rt ≤ 22 days among different seasonal periods. This change has shown the significant influence of hydrologic period and geomorphological features on Rt. Rt, in its turn, has shown significant spatial heterogeneity, depending on location and stretch of the channels. Comparative analyses between simulated and experimental parameters evidenced statistical correlations higher than 0.9. We conclude that the generated Rt scenarios were consistent with other similar studies in the literature. Therefore, they depicted the applicability of the hydrodynamics to the conservation of the Amazonian aquatic ecosystem, as well as its relevance for biochemical and pollutant dispersion studies, which still remain scarce in the literature.

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22

Tutro, Magdalena, Paweł S. Hachaj, Monika Szlapa, Piotr Gierszewski, Michał Habel, Włodzimierz Juśkiewicz i Natalia Mączka. "Implementation of the AdH hydrodynamic model on the Włocławek Reservoir". Geographia Polonica 95, nr 4 (2022): 371–86. http://dx.doi.org/10.7163/gpol.0241.

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The variation of water velocity in an artificial dam reservoir is influenced not only by the inflow discharge, but also by the bathymetry of the reservoir and the water level at the dam. The depiction of spatially complex variations in flow velocity through a reservoir would not be possible without the use of hydrodynamic models. A reliable hydrodynamic model of the reservoir is an effective tool for predicting and analyzing changes in the reservoir geoecosystem in an age of changing climate and risk of water stress. A depth-averaged two-dimensional AdH model was used to visualize the hydrodynamics of the Włocławek Reservoir. Running the model for eight different hydrological conditions delivered consistent results and allowed to calibrate the model parameters. Additionally, it provided a way to verify the data regarding the rating curve of the Vistula River upstream the reservoir.

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23

Man’ko, Olga M., i Alexander E. Smoleyevsky. "Risks of the Vision System Lesion during a Long Space Flight". AEROSPACE SPHERE JOURNAL, nr 2 (26.06.2021): 34–41. http://dx.doi.org/10.30981/2587-7992-2020-107-2-34-41.

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The article describes the factors of a long-term space flight associated with the risk of ocular pathology, including the established risk of space neuroocular syndrome (SANS). The mechanisms of intraocular hydrodynamic disturbance and their potential role in the development of SANS are considered. The results of the studies concerning the hydrodynamics of the eye in the conditions of simulated microgravity are presented.

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24

Majtan, Eda, Lee S. Cunningham i Benedict D. Rogers. "Experimental and Numerical Investigation of Floating Large Woody Debris Impact on a Masonry Arch Bridge". Journal of Marine Science and Engineering 10, nr 7 (1.07.2022): 911. http://dx.doi.org/10.3390/jmse10070911.

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Masonry arch bridges form an essential part of existing transport infrastructure around the world, including mainland Europe and the northeastern US. Recent extreme flood events highlight that masonry arch bridges spanning watercourses are vulnerable to flood-induced hydrodynamic and debris impact loads. When the flow interacts with the bridge superstructure, with or without discrete floating debris, a complex interaction is observed. This paper presents both experimental and numerical studies to investigate this complex phenomenon, including fluid–structure and structure–structure interactions. A typical single-span masonry arch bridge and large woody debris representing a tree log are investigated. Experimental observations from a scaled hydraulic model, with and without debris in the flow, are first presented for the case where the abutment of the bridge is fully submerged. Next, the capability of the numerical method smoothed particle hydrodynamics (SPH) in simulating the hydrodynamic behaviour and debris impact observed in the experiment is discussed. Following this, both hydrodynamic and debris-induced pressure–time histories on the bridge are obtained using the SPH model. Results reveal that the debris impact leads to a significantly more localised load on the bridge compared to the situation with hydrodynamic load only.

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25

Shuli, Wang. "Hydrodynamic Studies on Heat Exchangers with Helical Baffles". Heat Transfer Engineering 23, nr 3 (maj 2002): 43–49. http://dx.doi.org/10.1080/014576302753605367.

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26

Krishnaiah, K., S. Guru i V. Sekar. "Hydrodynamic studies on inverse gas—liquid—solid fluidization". Chemical Engineering Journal 51, nr 2 (kwiecień 1993): 109–12. http://dx.doi.org/10.1016/0300-9467(93)80017-i.

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27

SOUISSI, K., F. ODEH, H. H. K. TANG i A. GNUDI. "COMPARATIVE STUDIES OF HYDRODYNAMIC AND ENERGY TRANSPORT MODELS". COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 13, nr 2 (luty 1994): 439–53. http://dx.doi.org/10.1108/eb010127.

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28

Sinitsyna, N. N. "Numerical studies on alluvia settlement, considering hydrodynamic interaction". Physical Oceanography 9, nr 5 (wrzesień 1998): 373–82. http://dx.doi.org/10.1007/bf02522733.

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29

TAZAKI, Michiko, Iwao MARUYAMA, Satoru TAKASE i Terutaka HOMMA. "Studies of hydrodynamic chromatography of polymers. IV. Capillary hydrodynamic chromatography of polysaccharides, schizophyllan, and xanthan." KOBUNSHI RONBUNSHU 45, nr 1 (1988): 19–23. http://dx.doi.org/10.1295/koron.45.19.

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30

Ulyukina, Elena A. "Experimental effi ciency studies of the hydrodynamic fi ltration of diesel fuel". Agricultural Engineering, nr 2 (2023): 34–40. http://dx.doi.org/10.26897/2687-1149-2023-2-34-40.

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The existing designs of standard fuel treatment filters containing replaceable filter elements have a short service life and do not always fully meet the requirements of highly effi cient fuel filtering. Based of new technical solutions, the authors designed a hydrodynamic filter with hydrophobic screen partition. The filter element with a hydrophobic screen partition was tested at 20°C with diesel fuel DT-5 EURO, class 4, type III according to GOST Р 52368-2005 (ЕН 590:2004) under the standard test procedure of filters and fi lter-separators for ground fuel filtering facilities. The content of mechanical impurities in diesel fuel was determined according to GOST EH 12662-2016. To statistically process research results, the authors used Statgraphics software package. It has been established that in the hydrodynamic filter the separating screen partition No. 004 has optimal cell size and acceptable hydraulic characteristics. The authors conducted a full factorial experiment to estimate the partition’s infl uence on the filtering properties. According to its results, the greatest infl uence on the removal of mechanical impurities at hydrodynamic filtration belongs to the speed of fuel fl ow, the smallest - the partition inclination angle and the concentration of mechanical impurities. The presented regression model of hydrodynamic filtering is useful for forecasting the effi ciency of diesel fuel cleaning. The conducted research is helpful for determining physical operating conditions of the hydrodynamic filter with a hydrophobic screen partition at the designing stage and setting design parameters of filtering partitions to ensure the optimum functioning of the device.

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31

DUFTY, JAMES W. "KINETIC THEORY AND HYDRODYNAMICS FOR A LOW DENSITY GRANULAR GAS". Advances in Complex Systems 04, nr 04 (grudzień 2001): 397–406. http://dx.doi.org/10.1142/s0219525901000395.

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Many features of real granular fluids under rapid flow are exhibited as well by a system of smooth hard spheres with inelastic collisions. For such a system, it is tempting to apply standard methods of kinetic theory and hydrodynamics to calculate properties of interest. The domain of validity for such methods is a priori uncertain due to the inelasticity, but recent systematic studies continue to support the utility of kinetic theory and hydrodynamics as both qualitative and quantitative descriptions for many physical states. The basis for kinetic theory and hydrodynamic descriptions is discussed briefly for the special case of a low density gas.

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32

Martin, J. K., i D. W. Parkins. "Theoretical Studies of a Continuously Adjustable Hydrodynamic Fluid Film Bearing". Journal of Tribology 124, nr 1 (28.02.2001): 203–11. http://dx.doi.org/10.1115/1.1396343.

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Principles of a continuously adjustable hydrodynamic bearing are described together with an analysis model for studying its theoretical performance. The model included an expanded form of the governing Reynolds equation which took account of non-uniform variations in the fluid film thickness. A solution procedure was devised whereby for a given set of adjustment conditions, simultaneously converged fields of fluid film thickness, temperature, viscosity and pressure would result, together with oil film forces. A wide range of operating characteristics were studied with results predicting advantages and benefits over conventional hydrodynamic bearings.

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33

Javanmardi, M., E. Jahanbakhsh, M. Seif i H. Sayyaadi. "Hydrodynamic Analysis of Trimaran Vessels". Polish Maritime Research 15, nr 1 (1.01.2008): 11–18. http://dx.doi.org/10.2478/v10012-007-0046-5.

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Hydrodynamic Analysis of Trimaran Vessels Trimaran vessels are developed for different applications and hydrodynamic behavior of such vessels is different than usual mono-hulls. In this paper hydrodynamic resistance and maneuvering of a trimaran with Wigley body form are investigated. The effects of outriggers position in four different longitudinal and two transverse locations are studied. For hydrodynamic simulations a CFD code has been developed and used. This code is capable for simulating three dimensional, time dependent, two phases, viscous flow coupled with rigid body motion. Formulation and solution algorithm are described in detail. Different case studies have been performance and numerical results have shown good agreement with experimental data. Based on resistance and maneuvering simulation of the trimaran vessels different conclusion are made. The results show that positions of outriggers have great effect on resistance and maneuverability of trimaran. The present method can be further employed to investigate other hydrodynamic qualities of trimaran vessels.

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Gavrilescu, Maria, Florina Ungureanu i Radu Z. Tudose. "TRIPHASIC EXTERNAL-LOOP AIRLIFT REACTORS. HYDRODYNAMIC AND DISPERSION STUDIES". Environmental Engineering and Management Journal 7, nr 3 (2008): 217–25. http://dx.doi.org/10.30638/eemj.2008.036.

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Florescu, Daniela, i Iulian Florescu. "Studies on the Hydrodynamic Flow through the Cylinder Valve". Advanced Materials Research 837 (listopad 2013): 84–87. http://dx.doi.org/10.4028/www.scientific.net/amr.837.84.

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The paper aims to highlight the pressure and velocity variations on power lines created by water flowing through a cylindrical valve. Drain valve is typical cylindrical bottom of the dam or hydroelectric penstocks. Varieties of dimensions of these valves allow different analyses of the dynamics within them. The valves are able to access water from both sides and different ways of filling and closing action items. This paper presents a method to analyse the influence of parameters on physical-mechanical construction or operation and hence derive dynamic optimal design of these types of valves. Refer to the more intermediate positions of the piston sealing and visualization power lines and areas of turbulence for each position.

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36

Webber, Richard M., John L. Anderson i Myung S. Jhon. "Hydrodynamic studies of adsorbed diblock copolymers in porous membranes". Macromolecules 23, nr 4 (lipiec 1990): 1026–34. http://dx.doi.org/10.1021/ma00206a020.

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Kato, Susumu, Osamu Tatebe, Ryuichi Ishizaki, Isao Matsushima, Eiichi Takahashi i Yoshiro Owadano. "Simulation Studies on Hydrodynamic Instabilities in Inertial Confinement Fusion". Progress of Theoretical Physics Supplement 138 (2000): 730–31. http://dx.doi.org/10.1143/ptps.138.730.

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GARNIER, ALAIN, CLAUDE CHAVARIE, GERALD ANDRE i DANILO KLVANA. "THE INVERSE FLUIDIZATION AIRLIFT BIOREACTOR, PART I: HYDRODYNAMIC STUDIES". Chemical Engineering Communications 98, nr 1 (grudzień 1990): 31–45. http://dx.doi.org/10.1080/00986449008911559.

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39

Baléo, Jean-Noël, Philippe Humeau i Pierre Le Cloirec. "Numerical and experimental hydrodynamic studies of a lagoon pilot". Water Research 35, nr 9 (czerwiec 2001): 2268–76. http://dx.doi.org/10.1016/s0043-1354(00)00502-9.

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40

Saxena, S. C., i R. Vadivel. "Heat transfer and hydrodynamic studies in gas-fluidized beds". Energy 14, nr 6 (czerwiec 1989): 353–62. http://dx.doi.org/10.1016/0360-5442(89)90018-2.

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41

Sahoo, Pranati, i Abanti Sahoo. "Hydrodynamic studies on fluidization of Red mud: CFD simulation". Advanced Powder Technology 25, nr 6 (listopad 2014): 1699–708. http://dx.doi.org/10.1016/j.apt.2014.06.017.

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42

Chi, Guoxiang, i Chunji Xue. "Introduction to thematic section on hydrodynamic studies of mineralization". Geoscience Frontiers 2, nr 3 (lipiec 2011): 421–22. http://dx.doi.org/10.1016/j.gsf.2011.07.001.

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43

Kryk, H., M. Schubert, G. Hessel, H. V. Hristov i H. J. Friedrich. "LIF Based Hydrodynamic Studies in Pilot-scale Electrolytic Cells". Chemie Ingenieur Technik 80, nr 9 (wrzesień 2008): 1314. http://dx.doi.org/10.1002/cite.200750580.

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Lechowska, Joanna, Marian Kordas, Maciej Konopacki, Karol Fijałkowski, Radosław Drozd i Rafał Rakoczy. "Hydrodynamic studies in magnetically assisted external-loop airlift reactor". Chemical Engineering Journal 362 (kwiecień 2019): 298–309. http://dx.doi.org/10.1016/j.cej.2019.01.037.

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Attia Hili, Molka, Slim Bouaziz, Mohamed Maatar, Tahar Fakhfakh i Mohamed Haddar. "Hydrodynamic and Elastohydrodynamic Studies of a Cylindrical Journal Bearing". Journal of Hydrodynamics 22, nr 2 (kwiecień 2010): 155–63. http://dx.doi.org/10.1016/s1001-6058(09)60041-x.

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Stayton, C. Tristan. "Performance Surface Analysis Identifies Consistent Functional Patterns across 10 Morphologically Divergent Terrestrial Turtle Lineages". Integrative and Comparative Biology 59, nr 2 (11.06.2019): 346–57. http://dx.doi.org/10.1093/icb/icz072.

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Abstract Newly-developed methods for utilizing performance surfaces—multivariate representations of the relationship between phenotype and functional performance—allow researchers to test hypotheses about adaptive landscapes and evolutionary diversification with explicit attention to functional factors. Here, information from performance surfaces of three turtle shell functions—shell strength, hydrodynamics, and self-righting—is used to test the hypothesis that turtle lineages transitioning from aquatic to terrestrial habitats show patterns of shell shape evolution consistent with decreased importance of hydrodynamic performance. Turtle shells are excellent model systems for evolutionary functional analysis. The evolution of terrestriality is an interesting test case for the efficacy of these methods because terrestrial turtles do not show a straightforward pattern of morphological convergence in shell shape: many terrestrial lineages show increased shell height, typically assumed to decrease hydrodynamic performance, but there are also several lineages where the evolution of terrestriality was accompanied by shell flattening. Performance surface analyses allow exploration of these complex patterns and explicit quantitative analysis of the functional implications of changes in shell shape. Ten lineages were examined. Nearly all terrestrial lineages, including those which experienced decreased shell height, are associated with morphological changes consistent with a decrease in the importance of shell hydrodynamics. This implies a common selective pattern across lineages showing divergent morphological patterns. Performance studies such as these hold great potential for integrating adaptive and performance data in macroevolutionary studies.

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Mardani, Neda, Kabir Suara, Helen Fairweather, Richard Brown, Adrian McCallum i Roy C. Sidle. "Improving the Accuracy of Hydrodynamic Model Predictions Using Lagrangian Calibration". Water 12, nr 2 (20.02.2020): 575. http://dx.doi.org/10.3390/w12020575.

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While significant studies have been conducted in Intermittently Closed and Open Lakes and Lagoons (ICOLLs), very few have employed Lagrangian drifters. With recent attention on the use of GPS-tracked Lagrangian drifters to study the hydrodynamics of estuaries, there is a need to assess the potential for calibrating models using Lagrangian drifter data. Here, we calibrated and validated a hydrodynamic model in Currimundi Lake, Australia using both Eulerian and Lagrangian velocity field measurements in an open entrance condition. The results showed that there was a higher level of correlation (R2 = 0.94) between model output and observed velocity data for the Eulerian calibration compared to that of Lagrangian calibration (R2 = 0.56). This lack of correlation between model and Lagrangian data is a result of apparent difficulties in the use of Lagrangian data in Eulerian (fixed-mesh) hydrodynamic models. Furthermore, Eulerian and Lagrangian devices systematically observe different spatio-temporal scales in the flow with larger variability in the Lagrangian data. Despite these, the results show that Lagrangian calibration resulted in optimum Manning coefficients (n = 0.023) equivalent to those observed through Eulerian calibration. Therefore, Lagrangian data has the potential to be used in hydrodynamic model calibration in such aquatic systems.

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Moiseev, Viktor, Evgeniya Manoilo, Yurij Manoilo, Kalif Repko, Oleg Zhuha i Denis Davydov. "HYDRAULIC RESISTANCE AND SPRAY REMOVAL IN STABILIZED THREE-PHASE FOAM LAYER". Bulletin of the National Technical University "KhPI". Series: Chemistry, Chemical Technology and Ecology, nr 1 (30.05.2023): 3–9. http://dx.doi.org/10.20998/2079-0821.2023.01.01.

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Industrial implementation of the stabilization method of the gas-liquid layer can significantly expand the field of use of foaming apparatus and opens up new opportunities for intensifying technological processes with the simultaneous creation of low-waste technologies. The article establishes the basic parameters influencing the hydrodynamics of foam apparatus, considers the basic constructions and operating modes of foam apparatus. The connection of hydrodynamic parameters is revealed. The hydrodynamic laws of the foam layer are considered. The indicated factors affecting the process of mass transfer, both in the gas and in the liquid phases. The conducted analysis of a number of studies showed that the perspective direction of intensification of the mass transfer process is the development of apparatuses with a three-phase fluidized bed of an irrigated nozzle of complex forms with mesh materials. A new design of the stabilizer with a large free volume and a spherical movable nozzle was developed. The advantage of the proposed design is the transition to a structured foam mode of operation at relatively low gas speeds, as well as a developed phase contact surface. After experimental studies of the hydrodynamic characteristics of the combined contact element, experimental data on hydrodynamic resistance and experimental indicators of spray attribution for a contact stage with combined contact elements were obtained. As a result of research, it was found that when using foam layer stabilizers, the spray ratio at the contact stage is reduced, which leads to more stable operation of the device. Empirical equation for determining the value of the spray attribution is given. It is indicated that the mechanism of transition of the nozzle to the mode of advanced fluidization will be significantly different from conventional ballistic nozzles. The study of mass transfer in an absorber with a fluidized bed of an irrigated nozzle is complicated by the fact that the contact surface between phases can vary considerably depending on the hydrodynamic conditions, in particular, on the speed of gas and irrigation density.

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Malang, Jameson, Perumal Kumar i Agus Saptoro. "Computational Fluid Dynamics-Based Hydrodynamics Studies in Packed Bed Columns: Current Status and Future Directions". International Journal of Chemical Reactor Engineering 13, nr 3 (1.09.2015): 289–303. http://dx.doi.org/10.1515/ijcre-2014-0121.

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Abstract A careful review of the literature reveals that extensive research has been done on the hydrodynamics in packed bed columns using turbulence models. It can be noted that the choice of turbulence model is influenced by the number of phases, type of fluid, Reynolds number range and the type of packing. Thus, comparison of turbulence models for the selection of a suitable model assumes great importance for the better prediction of flow pattern. This is due to the fact that poor prediction of the flow pattern can lead to a limited heat and mass transfer model as the rate of transfer processes in packed bed is governed by the hydrodynamics of the packed bed. The aim of this paper is to give a review of the computational fluid dynamics (CFD)-based hydrodynamics studies of packed bed columns with the primary interest of studying pressure drop and drag coefficient in packed beds. From the literature survey in Science Direct database, more than 48,000 papers related to packed bed columns have been published with more than 3,000 papers focused on the hydrodynamic studies of the bed to date. Unfortunately, there are only a few studies reported on the hydrodynamics of packed columns under supercritical fluid condition. Therefore, it is imperative that the future work has to focus on the hydrodynamics of supercritical packed column and particularly on the selection of suitable turbulence model.

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Zieliński, Marcin, Paulina Rusanowska, Aleksandra Krzywik, Magda Dudek, Anna Nowicka i Marcin Dębowski. "Application of Hydrodynamic Cavitation for Improving Methane Fermentation of Sida hermaphrodita Silage". Energies 12, nr 3 (7.02.2019): 526. http://dx.doi.org/10.3390/en12030526.

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Hydrodynamic cavitation was recently applied as a biomass pretreatment method. Most of the studies which used hydrodynamic cavitation were applied to pretreated sugarcane bagasse or reed. High biomass yield of Sida hermaphrodita points out the necessity of studies on its effective pretreatment before methane fermentation, especially because its “wood-like” characteristics could present different disintegration properties than other lignocellulose biomass. Thus, the aim of the study was to investigate the influence of duration of hydrodynamic cavitation on lignocellulose composition in Sida hermaphrodita silage, and the assessment of disintegrated biomass as a substrate for methane fermentation. The study showed a slight decrease in lignin, cellulose, and hemicellulose content in biomass after hydrodynamic cavitation, which resulted in a higher content of carbohydrates in the liquid fraction of disintegrated substrates. Methane production was 439.1 ± 45.0 L CH4/kg total solids (TS) from the substrate disintegrated for 20 min. However, the most effective time for methane production was hydrodynamic cavitation of the substrate for 5 min. At this pretreatment duration, the highest values for chemical oxygen demand (COD), total organic carbon (TOC), and carbohydrate reduction were also noted. The study proved that hydrodynamic cavitation applied for 5 min allowed obtaining an energy profit of 0.17 Wh/g TS. The studies on a laboratory scale indicated that the technology of hydrodynamic cavitation of Sida hermaphrodita could be economically applied for methane fermentation on a large scale.

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