Artykuły w czasopismach: „Hydrodynamics- Liquid flow”

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Tojimatovich, Karimov Ikromali, i Rakhmanov Abdukhalim Toshpulat Ugli. "HYDRODYNAMICS OF HEAVY LIQUIDS IN A BUBBLING EXTRACTOR". International Journal of Advance Scientific Research 03, nr 06 (1.06.2022): 91–99. http://dx.doi.org/10.37547/ijasr-02-06-13.

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The article proposes a formula for calculating the flow rate of a heavy liquid supplied to the mixing zones of the apparatus. The experimental setup presents the results and analysis of experimental studies carried out to determine the flow rate of heavy liquid in the mixing zone of the bubbling extractor. The analysis confirmed the accuracy of the theoretical equation proposed for calculating the heavy liquid flow rate. According to the results of the study, it was possible to determine the flow rate of heavy liquid depending on the size and coefficient of resistance of the holes.

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Gupta, Raghvendra, Sharon S. Y. Leung, Rogerio Manica, David F. Fletcher i Brian S. Haynes. "Hydrodynamics of liquid–liquid Taylor flow in microchannels". Chemical Engineering Science 92 (kwiecień 2013): 180–89. http://dx.doi.org/10.1016/j.ces.2013.01.013.

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Jovanović, Jovan, Wenya Zhou, Evgeny V. Rebrov, T. A. Nijhuis, Volker Hessel i Jaap C. Schouten. "Liquid–liquid slug flow: Hydrodynamics and pressure drop". Chemical Engineering Science 66, nr 1 (styczeń 2011): 42–54. http://dx.doi.org/10.1016/j.ces.2010.09.040.

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Lin, Fanghua, i Changyou Wang. "Recent developments of analysis for hydrodynamic flow of nematic liquid crystals". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 372, nr 2029 (28.11.2014): 20130361. http://dx.doi.org/10.1098/rsta.2013.0361.

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The study of hydrodynamics of liquid crystals leads to many fascinating mathematical problems, which has prompted various interesting works recently. This article reviews the static Oseen–Frank theory and surveys some recent progress on the existence, regularity, uniqueness and large time asymptotic of the hydrodynamic flow of nematic liquid crystals. We will also propose a few interesting questions for future investigations.

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Wang, Yi. "CFD Simulation on Hydrodynamics of Liquid-Liquid Slug Flow in Microchannel". Advanced Materials Research 936 (czerwiec 2014): 1662–65. http://dx.doi.org/10.4028/www.scientific.net/amr.936.1662.

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Hydrodynamics in a liquid-liquid slug flow in a T-junction microchannel of 600μm diameter, operated under a squeezing regime, was simulated with the computational fluid dynamics method. The slug flow generation simulated shows very good agreement with experimental snapshots where the clear slug formation takes place in the vicinity of the T-junction. The internal circulation within each slug was also obtained, which could make us better understand the hydrodynamics of liquid-liquid slug flow in microchannel.

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Nieves-Remacha, María José, Amol A. Kulkarni i Klavs F. Jensen. "Hydrodynamics of Liquid–Liquid Dispersion in an Advanced-Flow Reactor". Industrial & Engineering Chemistry Research 51, nr 50 (4.12.2012): 16251–62. http://dx.doi.org/10.1021/ie301821k.

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Kashid, M. N., D. Fernández Rivas, D. W. Agar i S. Turek. "On the hydrodynamics of liquid-liquid slug flow capillary microreactors". Asia-Pacific Journal of Chemical Engineering 3, nr 2 (marzec 2008): 151–60. http://dx.doi.org/10.1002/apj.127.

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Conan, C., O. Masbernat, S. Décarre i A. Liné. "Local hydrodynamics in a dispersed-stratified liquid–liquid pipe flow". AIChE Journal 53, nr 11 (2007): 2754–68. http://dx.doi.org/10.1002/aic.11309.

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Zhuang, Tieshuan, Jun Wu, Tao Zhang i Xiangwei Dong. "A weakly compressible smoothed particle hydrodynamics framework for melting multiphase flow". AIP Advances 12, nr 2 (1.02.2022): 025329. http://dx.doi.org/10.1063/5.0057583.

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In this study, the transient process of solid–liquid phase change is modeled and simulated by the multiphase smoothed particle hydrodynamics (SPH) method. First, to simulate the interfacial behaviors of melt liquids, the multiphase SPH model is established for immiscible viscous fluids with a large density ratio, where the environmental liquid surrounding the solid phase is considered, and the surface tension of the melt liquid can be accurately modeled by the continuum surface force method. Based on the multiphase model, the thermal dynamics model is incorporated to describe the heat conduction process. The solid–liquid phase change is realized by directly switching the state of the concerned SPH particle, where the absorbed latent heat is computed by the phase change model. Second, the model is validated by several simulation cases, including the Stefan problem, hydrostatic pressure of the evolving fluid interface, rising of two bubbles, and square droplet deformation, and the effects of numerical parameters on simulation accuracy and stability are also discussed. Third, the integrated SPH model is applied to simulate molten droplet formation and dropping processes. The results show that an initial solid–liquid interface disappears during the melting process, and new liquid–liquid interfaces gradually form and evolve under the action of surface tension, gravity, and viscosity. Phenomena such as thin-layer fluid dynamics and capillary instabilities are also reproduced, showing the effectiveness of the model for handling multiphase flow with heat conduction and phase change.

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Dijk, P. E., A. M. C. Janse, J. A. M. Kuipers i W. P. M. van Swaaij. "Hydrodynamics of liquid flow in a rotating cone". International Journal of Numerical Methods for Heat & Fluid Flow 11, nr 5 (sierpień 2001): 386–412. http://dx.doi.org/10.1108/09615530110397334.

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Nakoryakov, V. E., i O. N. Kashinsky. "Hydrodynamics of vertical two-phase gas-liquid flow". Experimental Thermal and Fluid Science 7, nr 2 (sierpień 1993): 129. http://dx.doi.org/10.1016/0894-1777(93)90111-u.

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Liu, Huishu, Jimiao Duan, Kecheng Gu, Jiang Li, Hao Yan, Jian Wang i Changjun Li. "Slug Flow Hydrodynamics Modeling for Gas–Liquid Two-Phase Flow in a Pipe". Energies 15, nr 2 (12.01.2022): 533. http://dx.doi.org/10.3390/en15020533.

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Gas–liquid flow in a pipeline is a very common. Slug two-phase flow is dominated in the case of slightly upward flow (+0.25°) and considered to be the comprehensive flow configuration, and can be in close contact with all the other flow patterns. The models of different flow patterns can be unified. Precise prediction of the slug flow is crucial for proper design and operation. In this paper, we develop hydrodynamics unified modeling for gas–liquid two-phase slug flow, and the bubble and droplet entrainment is optimized. For the important parameters (wall and interfacial friction factors, slug translational velocity and average slug length), the correlations of these parameters are optimized. Furthermore, the related parameters for liquid droplet and gas bubble entrainment are given. Accounting for the gas–liquid interface shape, hydrodynamics models, i.e., the flat interface model (FIM) and the double interface model (DIM), of liquid film in the slug body are applied and compared with the experimental data. The calculated results show that the predictions for the liquid holdup and pressure gradient of the DIM agree with experimental data better than those of the FIM. A comparison between the available experimental results and Zhang’s model calculations shows that the DIM model correctly describes the slug dynamics in gas–liquid pipe flow.

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Deshpande, Jaydeep B., Abha Gosavi i Amol A. Kulkarni. "Two-phase flow in metal monoliths: Hydrodynamics and liquid-liquid extraction". Canadian Journal of Chemical Engineering 92, nr 12 (29.10.2014): 2166–75. http://dx.doi.org/10.1002/cjce.22081.

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Kojic, Predrag, Jovana Kojic, Milada Pezo, Jelena Krulj, Lato Pezo i Nikola Mirkov. "Numerical study of the hydrodynamics and mass transfer in the external loop airlift reactor". Chemical Industry and Chemical Engineering Quarterly, nr 00 (2021): 34. http://dx.doi.org/10.2298/ciceq210522034k.

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The objective of this study was to investigate the hydrodynamics and the gas-liquid mass transfer coefficient of an external-loop airlift reactor (ELAR). The ELAR was operated in three cases: different inlet velocities of fluids, different alcohols solutions (water, 0.5% methanol, 0.5% ethanol, 0.5% propanol and 0.5% butanol) and different concentration of methanol in solutions (0%, 0.5%, 1%, 2% and 5%). The influence of superficial gas velocity and various diluted alcohol solutions on hydrodynamics and gas-liquid mass transfer coefficient of the ELAR was studied. Experimentally, the gas hold-up, liquid velocities and volumetric mass transfer coefficient values in the riser and the downcomer were obtained from the literature source. A computational fluid dynamics (CFD) model was developed, based on two-phase flow, investigating different liquids regarding surface tension, assuming the ideal gas flow, applying the finite volume method and Eulerian-Eulerian model. The volumetric mass transfer coefficient was determined using CFD model, as well as artificial neural network model. The effects of liquid parameters and gas velocity on the characteristics of the gas-liquid mass transfer were simulated. These models were compared with appropriate experimental results. CFD model successfully succeed to simulate the influence of different alcohols regarding the number of C-atoms on hydrodynamics and mass transfer.

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Hughes, Matthew T., Thomas R. Boziuk, Ari Glezer i Srinivas Garimella. "Flow regimes and hydrodynamics of acoustically actuated saturated liquid–vapor flow". Experimental Thermal and Fluid Science 148 (październik 2023): 110975. http://dx.doi.org/10.1016/j.expthermflusci.2023.110975.

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Sovilj, Milan. "Hydrodynamics of gas-agitated liquid-liquid extraction columns". Acta Periodica Technologica, nr 43 (2012): 199–216. http://dx.doi.org/10.2298/apt1243199s.

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Although the non-agitated extraction columns (spray column, packed column, perforated plate column, sieve plate column, etc) can handle high flow rates and are simple and cheap, there have been relatively few applications of these columns because they suffer from serious backmixing of the continuous phase. It was shown that the backmixing is reduced when the spray column is operated with dense packing of drops. Another way of increasing the efficiency of a non-agitated extraction column is to introduce an inert gas (air, nitrogen, oxygen) as a mixing agent in the two-phase liquid-liquid (L-L) system. This method of energy introduction increases the turbulence within the new three-phase gas-liquid-liquid (G-L-L) system, which causes an improved dispersion of droplets, and, consequently, a higher dispersed phase holdup and therefore a great mass transfer area. The present study reports the hydrodynamics in the non-agitated extraction columns, as well as the axial dispersion for the two- and three-phase systems.

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Cwudzinski, A. "Numerical Prediction of Hydrodynamic Conditions in one Strand Tundish. Influence of Thermal Conditions and Casting Speed/ Numeryczna Prognoza Warunków Hydrodynamicznych W Jednozyłowej Kadzi Posredniej. Wpływ Warunków Cieplnych I Predkosci Odlewania". Archives of Metallurgy and Materials 59, nr 4 (1.12.2014): 1249–56. http://dx.doi.org/10.2478/amm-2014-0214.

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Abstract This paper reports the results of computer simulations of the flow of liquid steel in a single-nozzle tundish, which describe the flow hydrodynamics, depending on the thermal conditions and casting speed. In this paper, five casting speeds, namely 0.3, 0.6, 0.9, 1.2 and 1.5 m/min., have been examined. In view of the fact that tundishes are being equipped with various flow control devices and the process of creating specific hydrodynamic conditions is influenced also by the temperature gradient, computer simulations of liquid steel flow under isothermal and non-isothermal conditions were performed. Computer simulations of liquid steel flow were performed using the commercial program Ansys-Fluent ®. In order to explain the phenomena occurring in the tundish working space, the buoyancy number (Bu) has been calculated. The next research step in the analysis of the flow pattern forming in different casting conditions was to record the E and F-type RTD characteristics and to describe the pattern of flow.

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Mohamad Amirur Rahman Azahar, Nofrizalidris Darlis, Norhafizzah Hassan, Zuliazura Mohd Salleh, Syafiqah Ruqaiyah Saiful Azam, Ishkrizat Taib, Mohd Zamani Ngali, Khairul Nizam Mustaffa i Muhamad Mohshein Hashim. "CFD Analysis on Different Filling Volume Capacity and Fluid Density for Flexitank Application". CFD Letters 15, nr 1 (11.01.2023): 115–26. http://dx.doi.org/10.37934/cfdl.15.1.115126.

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When it comes to the structural design of flexitanks used for freight transportation, liquid sloshing is a crucial subject of concern. However, with consideration of the flexitank shape, there is no specific capacity value that can be used as a guide for filling the liquid inside it. This phenomenon may cause a high-pressure impact on the flexitank, resulting in a leakage on the LLDPE package. One of the solutions to reduce the frequency of leaks occurred is to fill up the acceptable volume based on hydrodynamics performance. Therefore, the purpose of this paper is to investigate, using commercial computational fluid dynamics (CFD) software, the hydrodynamic performance of various flexitank filling volume capacities based on different liquid densities. This is evaluated by comparing the hydrodynamics study for filling capacities that are 1%, 2%, and 3% higher than the rated capacity for flexitanks that has been suggested by the Container Owner Association (COA). Due to the flexitanks thin walls, it is important to consider the impacts of fluid-structure interaction (FSI). To do this, a partitioned FSI approach is used by coupling the CFD and FEA solvers for this multi-physics issue. The main standpoint of FSI is that fluid forces are applied to structures, causing deformation. Hydrodynamic parameters such as structural deformation on flexitank, von-mises stress and von-mises strain were used to identify the suitable filling capacity for three different: water, latex, and crude palm oil, as these liquids are commonly used for flexitank. The results indicate that varying the liquid filling capacity affected the hydrodynamic performance of the flexitank. Following that, increasing the flexitank filled with water by 3% and increasing the flexitank filled with latex and CPO by 1% can lead to structural damage as it gives highest maximum value of total deformation for these capacities. Since the situation of the flexitank are in the braking condition, the highest elastic equivalent strain is occurred at the front-top of the flexitank structure.

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Muhammad Haidir Hamdan, Nofrizalidris Darlis, Yong Tze Mi, Izuan Amin Ishak, Syabillah Sulaiman, Md Norrizam Mohmad Ja’at, Abd Fathul Hakim Zulkifli, Khairul Nizam Mustafa i Muhamad Mohshein Hashim. "Hydrodynamics Analysis on Liquid Bulk Transportation with Different Driving Cycle Conditions". Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 100, nr 1 (6.12.2022): 137–51. http://dx.doi.org/10.37934/arfmts.100.1.137151.

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Liquid bulk transport is one of the most important modes of fluid package transport, whether by sea or land. Flexitank has recently attracted the attention of shipment companies as an alternative method of fluid transportation due to the benefits of cost effectiveness, large shipping capacity, environmental friendliness, and quick loading/unloading time. However, the industry reports some cases regarding the leakage of the flexitank during transportation. While the hydrodynamic behaviour of the flexitank during transportation may influence the tank surface leakage issue. Thus, this study aims to determine the suitable filling volume capacity on flexitank by using Computational Fluid Dynamics (CFD). Hydrodynamics performance such as wall shear stress, volume fraction, dynamic pressure, and slosh force will be analyzed on different filling volume capacities and driving cycles. The filling volume capacity analyzed in this study are 5%, 10%, 15% more, or less than the reference capacity, 24000 L, based on different driving cycles: city-suburban and freeway. The results indicate that varying the fill level capacity of the tank affected the liquid sloshing behaviour and hydrodynamic performance of the tank. The highest wall shear stress (WSS) occurs at a filling volume capacity of -15 % because it is increasing the wall shear stress by 80% (city-suburban) and 35% (freeway) than the reference value. Following that, both speed profiles with a +10 % filling volume have the dynamic pressure, reducing it by 60% (city-suburban) and 47% (freeway) compared to the reference value. Thus, the filling volume of +10% is recommended to be suitable for the flexitank. Hence, this study benefits liquid bulk transportation by increasing fill level capacity and optimizing hydrodynamic performance.

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Kashid, Madhvanand N., i David W. Agar. "Hydrodynamics of liquid–liquid slug flow capillary microreactor: Flow regimes, slug size and pressure drop". Chemical Engineering Journal 131, nr 1-3 (lipiec 2007): 1–13. http://dx.doi.org/10.1016/j.cej.2006.11.020.

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Abadie, Thomas, Joëlle Aubin, Dominique Legendre i Catherine Xuereb. "Hydrodynamics of gas–liquid Taylor flow in rectangular microchannels". Microfluidics and Nanofluidics 12, nr 1-4 (22.09.2011): 355–69. http://dx.doi.org/10.1007/s10404-011-0880-8.

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Angeli, P., i A. Gavriilidis. "Hydrodynamics of Taylor flow in small channels: A Review". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, nr 5 (1.05.2008): 737–51. http://dx.doi.org/10.1243/09544062jmes776.

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The improved mass transfer characteristics of Taylor flow, make it an attractive flow pattern for carrying out gas—liquid operations in microchannels. Mass transfer characteristics are affected by the hydrodynamic properties of the flow such as thickness of the liquid film that surrounds the bubbles, bubble velocity, bubble and slug lengths, mixing, and flow circulation in the liquid slugs, and pressure drop. Experimental, theoretical, and modelling attempts to predict these properties are reviewed and relevant correlations are given. Most of these refer to capillaries but there are number of studies on square channels. In general, flow properties are well understood and predicted for fully formed Taylor bubbles in a developed flow and in clean systems, particularly in circular channels. However, the presence of impurities and their effect on interfacial tension cannot be fully accounted for. In addition, there is still uncertainty on the size of bubbles and slugs that form under certain operating and inlet conditions, while there is little information for channels with non-circular cross-sections.

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Mukherjee, Dibyendu, Manindra N. Biswas i Arun K. Mitra. "Hydrodynamics of liquid-liquid dispersion in ejectors and vertical two phase flow". Canadian Journal of Chemical Engineering 66, nr 6 (grudzień 1988): 896–907. http://dx.doi.org/10.1002/cjce.5450660602.

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Takae, Kyohei, i Hajime Tanaka. "Role of hydrodynamics in liquid–liquid transition of a single-component substance". Proceedings of the National Academy of Sciences 117, nr 9 (12.02.2020): 4471–79. http://dx.doi.org/10.1073/pnas.1911544117.

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Liquid–liquid transition (LLT) is an unconventional transition between two liquid states in a single-component system. This phenomenon has recently attracted considerable attention not only because of its counterintuitive nature but also since it is crucial for our fundamental understanding of the liquid state. However, its physical understanding has remained elusive, particularly of the critical dynamics and phase-ordering kinetics. So far, the hydrodynamic degree of freedom, which is the most intrinsic kinetic feature of liquids, has been neglected in its theoretical description. Here we develop a Ginzburg–Landau-type kinetic theory of LLT taking it into account, based on a two-order parameter model. We examine slow critical fluctuations of the nonconserved order parameter coupled to the hydrodynamic degree of freedom in equilibrium. We also study the nonequilibrium process of LLT. We show both analytically and numerically that domain growth becomes faster (slower), depending upon the density decrease (increase) upon the transition, as a consequence of hydrodynamic flow induced by the density change. The coupling between nonconserved order parameter and hydrodynamic interaction results in anomalous domain growth in both nucleation-growth–type and spinodal-decomposition–type LLT. Our study highlights the characteristic features of hydrodynamic fluctuations and phase ordering during LLT under complex interplay among conserved and nonconserved order parameters and the hydrodynamic transport intrinsic to the liquid state.

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Dressaire, Emilie, Laurent Courbin, Adrian Delancy, Marcus Roper i Howard A. Stone. "Study of polygonal water bells: inertia-dominated thin-film flows over microtextured surfaces". Journal of Fluid Mechanics 721 (13.03.2013): 46–57. http://dx.doi.org/10.1017/jfm.2013.60.

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AbstractMicrotextured surfaces are commonly used to study complex hydrodynamic phenomena such as spreading and splashing of liquid droplets. However, although surface topography is known to modify near-surface flow, there is no theory able to quantitatively predict the dramatic changes in dynamics of liquid spreading and splashing. Here, we investigate experimentally water bells formed on micropatterned surfaces in order to characterize the hydrodynamics of inertia-dominated flows through regular porous layers. Water bells are self-suspended catenary-shaped liquid films created when a jet impinges on a horizontal disc called an impactor. We show that the presence of micrometre-sized posts regularly arranged on the impactor results in a decrease of the water bell radius and the loss of axisymmetry as open water bells adopt polygonal shapes. We introduce a simple model that captures the main features of the inertia-dominated flow and reveals the role of the hydrodynamic interactions between neighbouring posts. In addition to their applications for tunable jet atomization, these polygonal sheets provide a paradigmatic system for understanding inertia-dominated flow in porous media.

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Abiev, Rufat, Stanislav Svetlov i Stefan Haase. "Hydrodynamics and Mass Transfer of Gas-Liquid and Liquid-Liquid Taylor Flow in Microchannels". Chemical Engineering & Technology 40, nr 11 (7.06.2017): 1985–98. http://dx.doi.org/10.1002/ceat.201700041.

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Wengel, Monika, Barbara Miłaszewicz i Roman Ulbrich. "Some problems of hydrodynamics of two-phase flow mixtures in minichannels". Archives of Thermodynamics 35, nr 2 (1.06.2014): 93–101. http://dx.doi.org/10.2478/aoter-2014-0015.

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Abstract Gas-liquid two-phase flow in minichannels has been the subject of increased research interest in the past few years. Evaluation, however, of today’s state of the art regarding hydrodynamics of flow in minichannels shows significant differences between existing test results. In the literature there is no clear information regarding: defining the boundary between minichannels and conventional channels, labelling of flow patterns. The review of literature on the hydrodynamics of gas-liquid flow in minichannels shows that, despite the fact that many research works have been published, the problem of determining the effect of diameter of the minichannel on the hydrodynamics of the flow is still at an early stage. Therefore, the paperpresents the results of research concerning determination of flow regime map for the vertical upward flow in minichannels. The research is based on a comprehensive analysis of the literature data and on the research that has been carried out. Such approach to the mentioned above problems concerning key issues of the two-phase flow in minichannels allowed to determine ranges of occurrence of flow structures with a relatively high accuracy.

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Liu, Shu Chang, You Bin Wu, Zheng Jiang Wang, Jin Lei Wang, Bin Zheng, Jia Wei Li, Da Long Hu i in. "Numerical Investigations of Hydrodynamics in a Liquid-Solid Fluidized Bed". Materials Science Forum 1078 (22.12.2022): 191–200. http://dx.doi.org/10.4028/p-j9tv6p.

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The liquid-solid fluidization bed is an effective method for removing hard ions from water. However, it is widely believed that the flow in the liquid-solid fluidization bed is homogeneous, which limits the transfer rates of heat, mass, momentum, and mixing. In this study, the results of the computational fluid dynamics (CFD) method showed significant heterogeneous particle–fluid patterns in the liquid-solid fluidization bed. On the other hand, simulations of the hydrodynamics behavior in the liquid-solid fluidized bed were first performed using different solid particle sizes, then particle classification, velocity distribution, and the vortical structures in the liquid-solid fluidized bed were assessed. In addition, a new model was proposed in this study to predict the flow behavior of the fluid-particle system used. The obtained results demonstrated the presence of the heterogeneous flow regime in the liquid-solid fluidized bed. The developed model for the onset of heterogeneous fluidization behavior revealed reasonable prediction results. Therefore, this model can be applied in future related studies on the hydrodynamics of the liquid-solid fluidized bed.

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Tong, Qiu Fang, Zhong Hua Wu i Arun S. Mujumdar. "Optimization of Liquid Steel Flow in an Industrial Tundish". Advanced Materials Research 634-638 (styczeń 2013): 1752–55. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.1752.

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A computational fluid dynamic (CFD) model was developed to study the fluid flow phenomena taking place in an industrial tundish. Numerical results showed spatial distributions of the velocity vectors, the residence time and fields of turbulence kinetic energy. Selected computer simulation results were validated with experimental data. The effect of the impact pad and interior dams on the hydrodynamics of liquid steel flow were studied numerically and optimized to reduce the fraction of dead volume zones and augment nonmetallic inclusions to float into the slag. A novel design of a turbo-stopper was proposed and its function to decelerate the ladle shroud jet and direct the flow back to reduce slag entrapment was discussed. Such numerical results improved our understanding of the hydrodynamics of liquid steel flow in the tundish and contribute to an optimized operation.

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Yang, Lu, Yanxiang Shi, Milad Abolhasani i Klavs F. Jensen. "Characterization and modeling of multiphase flow in structured microreactors: a post microreactor case study". Lab on a Chip 15, nr 15 (2015): 3232–41. http://dx.doi.org/10.1039/c5lc00431d.

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We investigate the hydrodynamics of gas/liquid and liquid/liquid flows in the post microreactor with flow visualization and CFD simulation, and reveal the mechanism of mass transfer enhancement compared to open channels through transport analysis.

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Subramanian, Kumar, i Günter Wozny. "Analysis of Hydrodynamics of Fluid Flow on Corrugated Sheets of Packing". International Journal of Chemical Engineering 2012 (2012): 1–13. http://dx.doi.org/10.1155/2012/838965.

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Modelling of the hydrodynamics behaviour of the liquid on the corrugated sheets of packing is studied using three-dimensional, volume-of-fluid (VOF) model that is incorporated in Ansys Fluent 12.0. The flow of three different liquids with different physical properties is modelled. A domain of corrugated sheets of packing resembling the real structured packing with little modifications in the elementary geometry is constructed using ICEM CFD 12.0. The quantitative comparisons of the wetting behavior from the simulations are in good agreement with experiments. Further, the study has been extended to understand the influence of the second corrugated sheet on the flow behavior. The contours from the simulations indicate the liquid hold-up in the crimp of two corrugated sheets, and these results are in good agreement with the earlier experimental studies performed using X-ray tomography in the literature. The result from the simulation shows that even for the high flow rate of around 811 mL/min for silicon-oil (DC5), only 60% of the corrugated sheet has been wetted. Hence, the efficiency of the existing packing can be further increased by increasing the wetted area in the corrugated sheet of packing.

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Jana, Arun Kumar, Gargi Das i Prasanta Kumar Das. "The hydrodynamics of liquid–liquid upflow through a venturimeter". International Journal of Multiphase Flow 34, nr 12 (grudzień 2008): 1119–29. http://dx.doi.org/10.1016/j.ijmultiphaseflow.2008.06.008.

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DE JESUS, E. B., L. R. P. DE ANDRADE LIMA, L. A. BERNARDEZ i P. F. ALMEIDA. "HYDRODYNAMICS IN A TWO-COMPARTMENT BIOREACTOR". Latin American Applied Research - An international journal 47, nr 1 (31.01.2017): 23–28. http://dx.doi.org/10.52292/j.laar.2017.292.

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Upflow two-compartment packingfree/packed-bed bioreactors have been used in petroleum microbiology due to their similarity with the oil field close to the injection or production wells. This two-compartment configuration gives a particular hydrodynamics to the liquid phase. In this study the hydrodynamics of a pilot reactor filled with glass beads was studied using tracer experiments. The residence time distribution was calculated and interpreted. The results for interstitial Reynolds number (ReLi <0.3) show curves with a peak at the beginning and a long tail that is distorted by the solution flow rate. A model composed of a continuous stirred tank, plug flow and cross-flow reactors was used to describe the flow patterns.

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Alizada, Gunel. "Gas-hydrodynamics of gas-liquid flow in the reservoir-well system". All Sciences Abstracts 1, nr 2 (25.07.2023): 13–15. http://dx.doi.org/10.59287/as-abstracts.1205.

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A hydrodynamic model of gas-liquid flow in the reservoir-well system is developed and the boundary problem is solved.As the volume of liquid in the mixture is very small (5-10%), its effect on the gas-liquid mixture flow was considered only in terms of density change effect. It is assumed that liquid and gas particles move in the pipe at the same speed and there is no mass transfer.The gas is assumed to be ideal and an isothermal process is considered. The solution of some equations in initial and boundary conditions is found and the continuity condition at the well bottom is written, Pc(t) - bottom hole pressure is found. The borehole productivity is then determined by setting Pq.a (t) (taken from experiment).

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Zahn, Andreas, Lothar Ebner, Kurt Winkler, Jan Kratochvíl i Jindřich Zahradník. "The effect of two-phase flow regime on hydrodynamics and mass transfer in a horizontal-tube gas-liquid reactor". Collection of Czechoslovak Chemical Communications 50, nr 3 (1985): 745–57. http://dx.doi.org/10.1135/cccc19850745.

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The effect of two-phase flow regime on decisive hydrodynamic and mass transfer characteristics of horizontal-tube gas-liquid reactors (pressure drop, liquid holdup, kLaL) was determined in a cocurrent-flow experimental unit of the length 4.15 m and diameter 0.05 m with air-water system. An adjustable-height weir was installed in the separation chamber at the reactor outlet to simulate the effect of internal baffles on reactor hydrodynamics. Flow regime maps were developed in the whole range of experimental gas and liquid flow rates both for the weirless arrangement and for the weir height 0.05 m, the former being in good agreement with flow-pattern boundaries presented by Mandhane. In the whole range of experi-mental conditions pressure drop data could be well correlated as a function of gas and liquid flow rates by an empirical exponential-type relation with specific sets of coefficients obtained for individual flow regimes from experimental data. Good agreement was observed between values of pressure drop obtained for weirless arrangement and data calculated from the Lockhart-Martinelli correlation while the contribution of weir to the overall pressure drop was well described by a relation proposed for the pressure loss in closed-end tubes. In the region of negligible weir influence values of liquid holdup were again succesfully correlated by the Lockhart-Martinelli relation while the dependence of liquid holdup data on gas and liquid flow rates obtained under conditions of significant weir effect (i.e. at low flow rates of both phases) could be well described by an empirical exponential-type relation. Results of preliminary kLaL measurements confirmed the decisive effect of the rate of energy dissipation on the intensity of interfacial mass transfer in gas-liquid dispersions.

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36

Chinnov, E. A., i F. V. Ronshin. "Investigation of the gas-liquid flow hydrodynamics in minichannels of solar collectors under isothermal conditions". Journal of Physics: Conference Series 2211, nr 1 (1.03.2022): 012014. http://dx.doi.org/10.1088/1742-6596/2211/1/012014.

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Abstract In the paper the new experimental data are presented to study the gas-liquid flow in minichannels with a thickness of 1 mm and 1.2 mm in isothermal conditions. The design (fluid input conditions) and the width of the channels were changed. The boundaries between the patterns of the gas-liquid flow were determined. Gas-liquid flow regimes maps were created. The patterns of a gas-liquid flow and transition between flow patterns were analyzed in detail. It made possible to find out the features of the gas-liquid flow in the solar collectors minichannels.

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37

Czernek, Krystian, i Stanisław Witczak. "Non-Invasive Evaluation of Wavy Liquid Film". Chemical and Process Engineering 34, nr 2 (1.06.2013): 241–52. http://dx.doi.org/10.2478/cpe-2013-0020.

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The study presents the possible use of optoelectronic system for the measurement of values specific for hydrodynamics of two-phase gas very-high-viscosity liquid flow in vertical pipes. An experimental method was provided, and the findings were presented and analysed for selected values which characterise the two-phase flow.

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38

Tekic, Miodrag, Ivana Sijacki, Milenko Tokic, Predrag Kojic, Dragan Petrovic, Natasa Lukic i Svetlana Popovic. "Hydrodynamics of a self-agitated draft tube airlift reactor". Chemical Industry and Chemical Engineering Quarterly 20, nr 1 (2014): 59–69. http://dx.doi.org/10.2298/ciceq120627102t.

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The main hydrodynamic characteristics of a novel-constructed, self-agitated draft tube airlift reactor (DT-ALR) were investigated. Ten impellers, driven only by the means of gas throughput and induced liquid circulation, were inserted in the draft tube. The insertion of impellers caused bubble breakup and reduction of both mean bubble size and coalescence, even under the conditions of high gas throughputs. Although the impellers induced energy losses, the resistance to the flow was relatively lower due to their rotation, unlike the internals used in other research reported in the literature. In comparison to the conventional configuration of a DT-ALR, it was found that the presence of impellers led to significant changes in hydrodynamics: riser gas holdup and mixing time increased, while overall gas holdup and liquid velocity in the downcomer decreased.

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Araújo, J. D. P., J. M. Miranda i J. B. L. M. Campos. "CFD Study of the Hydrodynamics of Slug Flow Systems: Interaction between Consecutive Taylor Bubbles". International Journal of Chemical Reactor Engineering 13, nr 4 (1.12.2015): 541–49. http://dx.doi.org/10.1515/ijcre-2014-0161.

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Abstract Slug flow is one of the most frequently occurring multiphase flow patterns in industrial processes. A deep knowledge of its fundamentals is necessary to accurately model not only the fluid flow but also reaction and heat and mass transfer in several operation units. A numerical study is reported on the dynamics of slug flow, under laminar regime, in vertical columns of stagnant and co-current Newtonian and non-Newtonian liquids (shear-thickening and shear-thinning). A CFD package (Ansys FLUENT) with the VOF methodology was applied to simulate the flow of individual and pairs of consecutive Taylor bubbles. The behaviour of the most relevant hydrodynamic features with the approach of the trailing bubble towards the leading one is addressed, with particular emphasis to the role of the liquid rheology and flow configuration. The main results presented are the velocity ratio curves between consecutive bubbles, the variation of the bubbles shape, and the axial velocity and viscosity fields in the surrounding liquid. This bubble-bubble interaction data can be a keystone to improve and complement continuous slug flow simulators used for very long columns.

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40

Etminan, Amin, Yuri S. Muzychka i Kevin Pope. "A Review on the Hydrodynamics of Taylor Flow in Microchannels: Experimental and Computational Studies". Processes 9, nr 5 (15.05.2021): 870. http://dx.doi.org/10.3390/pr9050870.

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Taylor flow is a strategy-aimed flow to transfer conventional single-phase into a more efficient two-phase flow resulting in an enhanced momentum/heat/mass transfer rate, as well as a multitude of other advantages. To date, Taylor flow has focused on the processes involving gas–liquid and liquid–liquid two-phase systems in microchannels over a wide range of applications in biomedical, pharmaceutical, industrial, and commercial sectors. Appropriately micro-structured design is, therefore, a key consideration for equipment dealing with transport phenomena. This review paper highlights the hydrodynamic aspects of gas–liquid and liquid–liquid two-phase flows in microchannels. It covers state-of-the-art experimental and numerical methods in the literature for analyzing and simulating slug flows in circular and non-circular microchannels. The review’s main objective is to identify the considerable opportunity for further development of microflows and provide suggestions for researchers in the field. Available correlations proposed for the transition of flow patterns are presented. A review of the literature of flow regime, slug length, and pressure drop is also carried out.

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41

Barjaktarovic, Branislava, Milan Sovilj i Svetlana Popovic. "Hydrodynamics and axial mixing in a packed gas-liquid column". Acta Periodica Technologica, nr 34 (2003): 33–48. http://dx.doi.org/10.2298/apt0334033b.

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The objective of this study was to investigate the pilot-plant gas absorption packed column hydrodynamics, as well as axial mixing in the system air-water. The pressure drop and the gas phase holdup data were determined in dependence on the flow rates of gas and liquid phases. The influence of superficial velocities of liquid and gas phases on the liquid axial dispersion in a gas-liquid packed bed column (ID 15 cm) consisting of Raschig rings (15x15x2 mm) were investigated. The pressure drop was measured with a U-type manometer, connected to the bottom and the top of the working part of the column. The gas phase holdup data in the air-water two-phase system was calculated as a ratio of the gas phase volume to the total volume of the two-phase system. Axial dispersion in the water phase has been determined by examining of the distribution of residence times of a salt tracer (NaCl) in the packed bed. The tracer was injected in the liquid flow above the packed bed; samples of liquid were simultaneously taken from two sites at 1 m distance along the bed. Salt concentrations in the samples were determined by conductivity measurements. The mean residence time and the axial dispersion number were calculated by the moment method. The axial dispersion increases with an increase of liquid flow velocities and decrease of superficial air velocities.

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42

Cwudzinśki, A. "Mathematical Modeling and Industrial Experiment of Liquid Steel Flow in the Three Outlets Continuous Casting Bloom Tundish". Archives of Metallurgy and Materials 58, nr 4 (1.12.2013): 1077–83. http://dx.doi.org/10.2478/amm-2013-0129.

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Abstract The dynamic development of the continuous steel casting (CSC) process has resulted in the application of this technology to the casting of steel semi-finished products on a mass scale. In the CSC process, before the cooling and solidification of liquid steel commences, the liquid metal dynamically flows through the steelmaking ladle, the tundish and the mould. Therefore, the control of steel flow is the key to the correct process. One of the metallurgical device in which the control of steel flow hydrodynamics is of crucial importance is the tundish. The subject of investigation within the present study was a three-nozzle tundish designed for casting of blooms. The software program Ansys-Fluent R was employed for the analysis of tundish operation. For the verification of the correctness of obtained results, an industrial experiment was carried out. For modification of the hydrodynamic conditions within the working volume of the tundish, two flow control devices were proposed, namely: a dam and a dam with an overflow window. The outcome of performed computer simulations were liquid steel flow fields and residence time distribution curves.

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43

Yu, Sicen, Jiyizhe Zhang, Shaowei Li, Zhuo Chen i Yundong Wang. "Mass Transfer and Droplet Behaviors in Liquid-Liquid Extraction Process Based on Multi-Scale Perspective: A Review". Separations 10, nr 4 (18.04.2023): 264. http://dx.doi.org/10.3390/separations10040264.

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Liquid-liquid extraction is an important separation technology in the chemical industry, and its separation efficiency depends on thermodynamics (two-phase equilibrium), hydrodynamics (two-phase mixing and contact), and mass transfer (molecular diffusion). For hydrodynamics, the dispersion size of droplets reflects the mixing of two phases and determines the mass transfer contact area of the two phases. Therefore, a deep understanding of the droplet dispersion mechanism can help guide process intensification. The mass transfer and droplet behaviors in the liquid-liquid extraction process are reviewed based on three scales: equipment, droplets, and the interface between two liquids. Studies on the interaction between mass transfer and other performance parameters in extraction equipment as well as liquid-liquid two-phase flow models are reviewed at the equipment scale. The behaviors of droplet breakage and coalescence and the kernel function of the population balance equation are reviewed at the droplet scale. Studies on dynamic interfacial tension and interaction between interfaces are reviewed at the interface scale. Finally, the connection among each scale is summarized, the existing problems are analyzed, and some future research directions are proposed in the last section.

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44

Gheni, Saba A., i Muthanna H. Al-Dahhan. "Assessing the Feasibility of Optical Probe in Phase Holdup Measurements and Flow Regime Identification". International Journal of Chemical Reactor Engineering 13, nr 3 (1.09.2015): 369–79. http://dx.doi.org/10.1515/ijcre-2014-0147.

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Abstract Despite the hydrodynamics of trickle beds experiencing pilot size, on the contrary, the possibility of measuring hydrodynamic parameters locally and for large scale and finding an indicator to pinpoint the flow regime from trickling to pulsing remains obscure, to assess the feasibility of getting such information the reactor bed was randomly packed with equal-sized spherical beads of 3 mm diameter. Gas and liquid holdup measurements and flow regime identification were achieved at various flow conditions from trickling to the pulsing regime by an optical probe method using time series processing method. This method is shown to be simple and efficient provides quantitative information about the gas and liquid holdup variation in different flow regime. The various experimental results were compared to available literature models and correlations for confrontation and recommendations. The trickle-to-pulse flow transition boundary shifted towards higher gas and liquid superficial velocities, aligning with the findings on a variation of holdup along the axial direction confirmed to broaden the trickle flow domain. [Correction added after online publication June 26, 2015: To unify the adjective everywhere in this manuscript, optic fiber probe was changed to optical probe.]

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45

Lekhlif, B., D. Toye, P. Marchot i M. Crine. "Interactions between the biofilm growth and the hydrodynamics in an aerobic trickling filter". Water Science and Technology 29, nr 10-11 (1.10.1994): 423–30. http://dx.doi.org/10.2166/wst.1994.0788.

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We analyse the interactions between the biofilm growth and the liquid flow distribution in a trickling filter. Experiments are carried out on 0.5 m3 pilot scale reactor. We determine both the liquid flowrate distribution by local measurements and the filter performance by measuring the conversion. The liquid superficial flowrate ranges between 0 and 0.9 m/h. The synthetic effluent consists of a water solution of beet molasses and potassium dihydrogenophosphate. The hydrodynamic modelling allows us to relate the characteristics of the liquid flow distribution and the reactor performance to a single set of packing parameters. The packing irrigation rate plays a key role. Our results confirm the definite effect that the biofilm activity may have on the quality of the liquid flow distribution.

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46

Ge, Shixiong, Taoxian Zhang, Chun Tao, Weixing Huang i Dawei Pan. "Hydrodynamics of liquid-liquid two-phase flow accounting for the coupling of dean vortices and Poiseuille flow". Chemical Engineering Journal 458 (luty 2023): 141421. http://dx.doi.org/10.1016/j.cej.2023.141421.

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Ganguli, Arijit A., i Aniruddha B. Pandit. "Hydrodynamics of Liquid-Liquid Flows in Micro Channels and Its Influence on Transport Properties: A Review". Energies 14, nr 19 (23.09.2021): 6066. http://dx.doi.org/10.3390/en14196066.

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Hydrodynamics plays a major role in transport of heat and mass transfer in microchannels. This includes flow patterns and flow regimes in which the micro-channels are operated. The flow patterns have a major impact the transport properties. Another important aspect is the pressure drop in micro-channels. In the present review, the experimental and Computational Fluid Dynamics (CFD) studies covering all the above aspects have been covered. The effect of geometrical parameters like shape of channel, channel size, material of construction of channels; operating parameters like flow velocity, flow ratio and fluid properties have been presented and analyzed. Experimental and analytical work of different pressure drop models has also been presented. All the literature related to influence of flow patterns on transport properties like volumetric mass transfer coefficients (VMTC) and heat transfer coefficients (HTC) have been presented and analyzed. It is found that most works in Liquid-Liquid Extraction (LLE) systems have been carried out in slug flow and T-junctions. Models for coupled systems of flow and mass transfer have been presented and works carried out for different coupled systems have been listed. CFD simulations match experimental results within 20% deviations in quantitative and qualitative predictions of flow phenomena for most research articles referred in this review. There is a disparity in prediction of a generalized regime map and a generalized regime map for prediction of flow patterns for various systems would need the help of Artificial Intelligence.

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Zhang, Jingwei, Yiwei Zhou, Zhuo Chen i Jianhong Xu. "Hydrodynamics and liquid–liquid mass transfer in gas–liquid–liquid three-phase flow in a cross microchannel". Chemical Engineering Science 273 (czerwiec 2023): 118657. http://dx.doi.org/10.1016/j.ces.2023.118657.

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Chen, Pao Chi, Ming-Wei Yang i Yan-Lin Lai. "Hydrodynamic and Mass Transfer in the Desorption Process of CO2 Gas in a Packed-Bed Stripper". Processes 9, nr 1 (28.12.2020): 46. http://dx.doi.org/10.3390/pr9010046.

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A lab-scale packed-bed stripper containing Dixon rings was used to explore the effects of the process variables on the hydrodynamics and mass-transfer in a stripper using a mixed solvent loaded CO2. The variables are the liquid flow rate, reboiler temperature, and amine concentration, and the hydrodynamic and mass-transfer data can be determined using different models. In the case of hydrodynamics, the dimensionless pressure drop at the flooding point and the total pressure drop were explored first. In the case of mass-transfer, the correlation of the mass-transfer coefficient and the parameter importance were also observed. In addition, the number of plates per meter can be compared with the Dixon rings manufacturer. Finally, the performances of a mixed solvent and monoethanolamine (MEA) solvent were also discussed.

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Bardakov, R. N., Yu D. Chashechkin i V. V. Shabalin. "Hydrodynamics of a drying multicomponent liquid droplet". Fluid Dynamics 45, nr 5 (październik 2010): 803–16. http://dx.doi.org/10.1134/s0015462810050133.

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