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Articoli di riviste sul tema "Multiphase flow Computational fluid dynamics"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 11 febbraio 2022

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1

Malik, M. Rizwan, Tie Lin Shi, Zi Rong Tang, and Shi Yuan Liu. "Computational Fluid Dynamics (CFD) Based Simulated Study of Multi-Phase Fluid Flow." Defect and Diffusion Forum 307 (December 2010): 1–11. http://dx.doi.org/10.4028/www.scientific.net/ddf.307.1.

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It is critical to understand multiphase flow applications with regard to dynamic behavior. In this paper, a systematic approach to the study of these applications is pursued, leading to separated flows comprising the effects of free surface flows and wetting. For the first time, wetting phenomena (three wetting regimes such as no wetting, 90 º wetting angle and absolute wetting) are added in the separated flow model. Special attention is paid to computational fluid dynamics (CFD) in order to envisage the relationship between complex metallurgical practices such as mass and momentum exchange, t

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2

Olabode, Oluwasanmi, Gerald Egeonu, Richard Afolabi, Charles Onuh, and Chude Okonji. "Computational Fluid Dynamics (CFD) for Modelling Multiphase Flow in Hilly-Terrain Pipelines." Diffusion Foundations 28 (December 2020): 33–55. http://dx.doi.org/10.4028/www.scientific.net/df.28.33.

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The design and operation of subsea pipelines over the life-cycle of an asset is vital for continuous oil and gas production. Qualitative design and effective production operation of pipelines depend on fluid type(s) involved in the flow; and in the case of multiphase flow, the need to understand the behaviour of the fluids becomes more imperative. This work presented in this report is borne out of the need for more accurate ways of predicting multiphase flow parameters in subsea pipelines with hilly-terrain profiles by better understanding their flow behaviors. To this end, Computational Fluid

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3

Gel, A., R. Garg, C. Tong, M. Shahnam, and C. Guenther. "Applying uncertainty quantification to multiphase flow computational fluid dynamics." Powder Technology 242 (July 2013): 27–39. http://dx.doi.org/10.1016/j.powtec.2013.01.045.

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4

Shojaee, Saeed, Seyyed Hossein Hosseini, and Behzad Saeedi Razavi. "Computational Fluid Dynamics Simulation of Multiphase Flow in Structured Packings." Journal of Applied Mathematics 2012 (2012): 1–17. http://dx.doi.org/10.1155/2012/917650.

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A volume of fluid multiphase flow model was used to investigate the effective area and the created liquid film in the structured packings. The computational results revealed that the gas and liquid flow rates play significant roles in the effective interfacial area of the packing. In particular, the effective area increases as the flow rates of both phases increase. Numerical results were compared with the Brunazzi and SRP models, and a good agreement between them was found. Attention was given to the process of liquid film formation in both two-dimensional (2D) and three-dimensional (3D) mode

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5

Drikakis, Dimitris, Michael Frank, and Gavin Tabor. "Multiscale Computational Fluid Dynamics." Energies 12, no. 17 (2019): 3272. http://dx.doi.org/10.3390/en12173272.

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Computational Fluid Dynamics (CFD) has numerous applications in the field of energy research, in modelling the basic physics of combustion, multiphase flow and heat transfer; and in the simulation of mechanical devices such as turbines, wind wave and tidal devices, and other devices for energy generation. With the constant increase in available computing power, the fidelity and accuracy of CFD simulations have constantly improved, and the technique is now an integral part of research and development. In the past few years, the development of multiscale methods has emerged as a topic of intensi

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6

Hua, Tianyi, and Ryan L. Hartman. "Computational fluid dynamics of DNA origami folding in microfluidics." Reaction Chemistry & Engineering 4, no. 5 (2019): 818–27. http://dx.doi.org/10.1039/c8re00168e.

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7

Higdon, J. J. L. "Multiphase flow in porous media." Journal of Fluid Mechanics 730 (July 30, 2013): 1–4. http://dx.doi.org/10.1017/jfm.2013.296.

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AbstractMultiphase flows in porous media represent fluid dynamics problems of great complexity involving a wide range of physical phenomena. These flows have attracted the attention of an impressive group of renowned researchers and have spawned a number of classic problems in fluid dynamics. These multiphase flows are perhaps best known for their importance in oil recovery from petroleum reservoirs, but they also find application in novel areas such as hydrofracturing for natural gas recovery. In a recent article, Zinchenko & Davis (J. Fluid Mech. 2013, vol. 725, pp. 611–663) present comp

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8

Wong, Chong Yau, Joan Boulanger, and Gregory Short. "Modelling the Effect of Particle Size Distribution in Multiphase Flows with Computational Fluid Dynamics and Physical Erosion Experiments." Advanced Materials Research 891-892 (March 2014): 1615–20. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.1615.

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It is known that particle size has an influence in determining the erosion rate, and hence equipment life, on a target material in single phase flows (i.e. flow of solid particles in liquid only or gas only flows). In reality single phase flow is rarely the case for field applications in the oil and gas industry. Field cases are typically multiphase in nature, with volumetric combinations of gas, liquid and sand. Erosion predictions of multiphase flows extrapolated from single phase flow results may be overly conservative. Current understanding of particle size distribution on material erosion

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9

Romaní Fernández, Xiana, and Hermann Nirschl. "A Numerical Study of the Impact of Radial Baffles in Solid Bowl Centrifuges Using Computational Fluid Dynamics." Physical Separation in Science and Engineering 2010 (August 23, 2010): 1–10. http://dx.doi.org/10.1155/2010/510570.

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Centrifugal separation equipment, such as solid bowl centrifuges, is used to carry out an effective separation of fine particles from industrial fluids. Knowledge of the streams and sedimentation behavior inside solid bowl centrifuges is necessary to determine the geometry and the process parameters that lead to an optimal performance. Regarding a given industrial centrifuge geometry, a grid was built to calculate numerically the multiphase flow of water, air, and particles with a computational fluid dynamics (CFD) software. The effect of internal radial baffles on the multiphase flow was inve

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10

Faltsi, O., S. D. Vlaev, D. Sofialidis, and J. Kirpitsas. "Novel areas and future trends of computational fluid dynamics software applications in chemical engineering." Chemical Industry and Chemical Engineering Quarterly 12, no. 4 (2006): 213–19. http://dx.doi.org/10.2298/ciceq0604213f.

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The paper presents a brief overview of advanced novel applications and future trends of Computational Fluid Dynamics software in Chemical Engineering. Among the cases of major importance, single phase turbulent flow, as well as multiphase flow models are reviewed. Referring to single phase flows, the LES and RANS approaches are described and illustrated. The RANS approach is revealed as the most popular and inexpensive method for the analysis and solving of technical tasks. The paper reports on two recent modeling applications, namely, the CFD facilitated design of a new mixing impeller and th

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11

Lu, Yaojun, and Madhusuden Agrawal. "A Computational-Fluid-Dynamics-Based Eulerian-Granular Approach for Characterization of Sand Erosion in Multiphase-Flow Systems." SPE Journal 19, no. 04 (2013): 586–97. http://dx.doi.org/10.2118/159921-pa.

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Summary This paper presents a computational-fluid-dynamics (CFD)-based Eulerian-Granular approach for characterizing erosion wear in multiphase-flow systems. In contrast to the conventional CFD-based Eulerian-Lagrangian approach, the Eulerian-Granular approach takes account of multiphase dynamics on the basis of the multifluid concept and the kinetic theory; therefore, a more realistic erosion prediction can be achieved. Both the benchmark study and typical applications have demonstrated the effectiveness of the CFD-based Eulerian-Granular approach from dilute to condensed flow systems. Unlike

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12

Kone, Jean-Paul, Xinyu Zhang, Yuying Yan, Guilin Hu, and Goodarz Ahmadi. "Three-dimensional multiphase flow computational fluid dynamics models for proton exchange membrane fuel cell: A theoretical development." Journal of Computational Multiphase Flows 9, no. 1 (2017): 3–25. http://dx.doi.org/10.1177/1757482x17692341.

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A review of published three-dimensional, computational fluid dynamics models for proton exchange membrane fuel cells that accounts for multiphase flow is presented. The models can be categorized as models for transport phenomena, geometry or operating condition effects, and thermal effects. The influences of heat and water management on the fuel cell performance have been repeatedly addressed, and these still remain two central issues in proton exchange membrane fuel cell technology. The strengths and weaknesses of the models, the modelling assumptions, and the model validation are discussed.

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13

Pang, Chong, Wei Tan, Endian Sha, Yuanqing Tao, and Liyan Liu. "Simulating multiphase flow in a two-stage pusher centrifuge using computational fluid dynamics." Frontiers of Chemical Science and Engineering 6, no. 3 (2012): 329–38. http://dx.doi.org/10.1007/s11705-012-1205-5.

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14

Maru, Wessenu, Daniel Holland, Susithra Lakshmanan, Andy Sederman, and Andrew Thomas. "Multiphase flow and mixing quantification using computational fluid dynamics and magnetic resonance imaging." Flow Measurement and Instrumentation 77 (March 2021): 101816. http://dx.doi.org/10.1016/j.flowmeasinst.2020.101816.

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15

Chen, Xianghui, Brenton S. McLaury, and Siamack A. Shirazi. "A Comprehensive Procedure to Estimate Erosion in Elbows for Gas/Liquid/Sand Multiphase Flow." Journal of Energy Resources Technology 128, no. 1 (2005): 70–78. http://dx.doi.org/10.1115/1.2131885.

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A comprehensive procedure that combines mechanistic analysis and numerical simulation approaches is proposed to estimate the erosion in elbows for gas/liquid/sand particle multiphase flow systems. The erosion problem in multiphase flow is approximately transferred to one in single-phase flow by introducing the effective sand mass ratio and a representative single-phase flow to which a single-phase computational-fluid-dynamics-based erosion-prediction model can be applied. Erosion in elbows is calculated for various multiphase flow patterns and compared to experimental data in the literature. R

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16

Shiea, Mohsen, Antonio Buffo, Marco Vanni, and Daniele Marchisio. "Numerical Methods for the Solution of Population Balance Equations Coupled with Computational Fluid Dynamics." Annual Review of Chemical and Biomolecular Engineering 11, no. 1 (2020): 339–66. http://dx.doi.org/10.1146/annurev-chembioeng-092319-075814.

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This review article discusses the solution of population balance equations, for the simulation of disperse multiphase systems, tightly coupled with computational fluid dynamics. Although several methods are discussed, the focus is on quadrature-based moment methods (QBMMs) with particular attention to the quadrature method of moments, the conditional quadrature method of moments, and the direct quadrature method of moments. The relationship between the population balance equation, in its generalized form, and the Euler-Euler multiphase flow models, notably the two-fluid model, is thoroughly di

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17

Frank, Michael, Robin Kamenicky, Dimitris Drikakis, Lee Thomas, Hans Ledin, and Terry Wood. "Multiphase Flow Effects in a Horizontal Oil and Gas Separator." Energies 12, no. 11 (2019): 2116. http://dx.doi.org/10.3390/en12112116.

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An oil and gas separator is a device used in the petroleum industry to separate a fluid mixture into its gaseous and liquid phases. A computational fluid dynamics (CFD) study aiming to identify key design features for optimising the performance of the device, is presented. A multiphase turbulent model is employed to simulate the flow through the separator and identify flow patterns that can impinge on or improve its performance. To verify our assumptions, we consider three different geometries. Recommendations for the design of more cost- and energy-effective separators, are provided. The resu

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18

Guo, Xipeng, Joel Godinez, Nicholas J. Walla, et al. "Computational Investigation of Inclusion Removal in the Steel-Refining Ladle Process." Processes 9, no. 6 (2021): 1048. http://dx.doi.org/10.3390/pr9061048.

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In a steel-refining ladle, the properties of manufactured steel can be notably degraded due to the presence of excessive inclusions. Stirring via gas injection through a porous plug is often used as part of the steel-refining process to reduce these inclusions. In this paper, 3D computational fluid dynamics (CFD) modeling is used to analyze transient multiphase flow and inclusion removal in a gas-stirred ladle. The effects of gas stirring with bubble-inclusion interaction are analyzed using the Euler–Euler approach for multiphase flow modeling, while the effects of inclusions aggregation and r

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19

Li, Bai Chun, Wen Qiang Lin, and La Mei Wang. "Multiphase Flow Simulation and the Analysis Method of the Pressure Drop in the Vibrated Fluidized Bed." Advanced Materials Research 118-120 (June 2010): 935–39. http://dx.doi.org/10.4028/www.scientific.net/amr.118-120.935.

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This paper designed experimental system and the corresponding multi-particle coal particles experiments. At the same time based on computational fluid dynamics (CFD), we use Fluent as a tool to carry out the corresponding multiphase flow simulation experiments. The simulation results have a good consistency with the experimental results. Ultimately, we acquire the pressure drop calculation model and the simulation method of the multiphase flow pressure drop analysis inside the vibrated fluidized bed.

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20

Dong, Zhi Feng, Yin Song, Yong Zheng Gu, and Wei Fu. "Flow Field Numerical Simulation of Diesel Engine Working Process." Advanced Materials Research 468-471 (February 2012): 1781–84. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.1781.

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The spatial fluid model in diesel engine was built, and multiphase flow transient numerical simulation of working process of diesel engine was done based on computational fluid dynamics. The visualized result of simulation shows the distribution of flow field, press and particle trajectory which can hardly tested direct under the actual working condition. Swirl formed during the intake process and accompanied the whole working process of diesel engine. Keywords: Diesel engine; Numerical simulation; Flow field; Particle trajectory

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21

Basha, Nausheen, Ahmed Kovacevic, and Sham Rane. "Analysis of Oil-Injected Twin-Screw Compressor with Multiphase Flow Models." Designs 3, no. 4 (2019): 54. http://dx.doi.org/10.3390/designs3040054.

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Growing demands for energy are motivating researchers to conduct in-depth analysis of positive displacement machines such as oil-injected screw compressors which are frequently used in industrial applications like refrigeration, oil and gas and air compression. The performance of these machines is strongly dependent on the oil injection. Optimisation of oil has a great energy saving potential by both increasing efficiency and reducing other impacts on the environment. Therefore, a three-dimensional, transient computational fluid dynamics study of oil injection in a twin-screw compressor is con

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22

Ansari, Mohaghegh, Shahnam, and Dietiker. "Modeling Average Pressure and Volume Fraction of a Fluidized Bed Using Data-Driven Smart Proxy." Fluids 4, no. 3 (2019): 123. http://dx.doi.org/10.3390/fluids4030123.

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Simulations can reduce the time and cost to develop and deploy advanced technologies and enable their rapid scale-up for fossil fuel-based energy systems. However, to ensure their usefulness in practice, the credibility of the simulations needs to be established with uncertainty quantification (UQ) methods. The National Energy Technology Laboratory (NETL) has been applying non-intrusive UQ methodologies to categorize and quantify uncertainties in computational fluid dynamics (CFD) simulations of gas-solid multiphase flows. To reduce the computational cost associated with gas-solid flow simulat

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23

Roshdi, Sepideh, Norollah Kasiri, Seyyed Hassan Hashemabadi, and Javad Ivakpour. "Computational fluid dynamics simulation of multiphase flow in packed sieve tray of distillation column." Korean Journal of Chemical Engineering 30, no. 3 (2013): 563–73. http://dx.doi.org/10.1007/s11814-012-0166-1.

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24

Zhao, Hong-Liang, Yan Liu, Ting-An Zhang, Songqing Gu, and Chao Zhang. "Computational Fluid Dynamics (CFD) Simulations on Multiphase Flow in Mechanically Agitated Seed Precipitation Tank." JOM 66, no. 7 (2014): 1218–26. http://dx.doi.org/10.1007/s11837-014-1012-1.

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Li, Wen Yan, and Ming Zhong Gao. "One Based Magnetic Oxygen Carrier Solid Fuel Chemical Looping Combustion System Simulation." Advanced Materials Research 800 (September 2013): 454–58. http://dx.doi.org/10.4028/www.scientific.net/amr.800.454.

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In this paper, Computational Fluid Dynamics (CFD) was used to simulate the magnetic device for the separation of Fe-base oxygen carrier in chemical-looping combustion system. The simulation was based on the Euler multiphase flow model and the k-ε turbulence model, which uses UDF programming to increase volume source phase. Here, commercial computational fluid dynamics software fluent platform was used to build the air reactor cold flow mathematical model, magnetic field under the conditions of different flow conditions were added for separating the Fe3O4 and Fe2O3. And the simulation results h

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26

Majnis, Mohd Fadhil, and Mohamad Rawad Jalwan. "Numerical Investigation on Multiphase Flows in Various Configurations of Microchannels Using Computational Fluid Dynamics." ASEAN Journal of Chemical Engineering 17, no. 1 (2019): 82. http://dx.doi.org/10.22146/ajche.49568.

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A two-dimensional domain of multiphase flow analyses in this study using the Volume of Fluid (VOF) model was carried out in order to simulate and predict the fluid flows and mixing performance of two miscible liquids in various microchannel configurations. The various microchannels configurations were designed accordingly and the simulation was carried out based on the justified conditions, assumptions and considerations by using the commercial computational fluid dynamics (CFD) software, FLUENT. The grid type and size of the computational domain were verified in terms of stability by performi

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27

Yan, Di, Ahmed Kovacevic, Qian Tang, Sham Rane, and Wenhua Zhang. "Numerical modelling of twin-screw pumps based on computational fluid dynamics." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 24 (2016): 4617–34. http://dx.doi.org/10.1177/0954406216670684.

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Increasing demands for high-performance screw pumps in oil and gas as well as other applications require deep understanding of the fluid flow field inside the machine. Important effects on the performance such as dynamic losses, influence of the leakage gaps and presence and extent of cavitation are difficult to observe by experiments. However, it is possible to study such effects using well-validated computational fluid dynamics models. The novel-structured numerical mesh consisting of a single-computational domain for moving screw pump rotors was developed to allow three-dimensional computat

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28

Huang, Chengyu, Wenhua Wang, and Weizhong Li. "A Novel 2D Model for Freezing Phase Change Simulation during Cryogenic Fracturing Considering Nucleation Characteristics." Applied Sciences 10, no. 9 (2020): 3308. http://dx.doi.org/10.3390/app10093308.

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A 2D computational fluid dynamics (CFD) model in consideration of nucleation characteristics (homogeneous/heterogeneous nucleation) using the volume of fluid (VOF) method and Lee model was proposed. The model was used to predict the process of a multiphase flow accompanied by freezing phase change during cryogenic fracturing. In this model, nucleation characteristic (homogeneous and heterogeneous nucleation) during the freezing process and the influence of the formed ice phase on the flowing behavior was considered. Validation of the model was done by comparing its simulation results to Neuman

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29

Lopez de Bertodano, Martin, Xiaodong Sun, Mamoru Ishii, and Asim Ulke. "Phase Distribution in the Cap Bubble Regime in a Duct." Journal of Fluids Engineering 128, no. 4 (2006): 811–18. http://dx.doi.org/10.1115/1.2201626.

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The lateral phase distribution in the cap-bubbly regime was analyzed with a three-dimensional three-field two-fluid computational fluid dynamics (CFD) model based on the turbulence model for bubbly flows developed by Lopez de Bertodano et al. [1994, “Phase Distribution in Bubbly Two-Phase Flow in Vertical Ducts,” Int. J. Multiphase Flow, 20(5), pp. 805–818]. The turbulent diffusion of the bubbles is the dominant phase distribution mechanism. A new analytic result is presented to support the development of the model for the bubble induced turbulent diffusion force. New experimental data obtaine

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Ahmed, Shofique Uddin, Rajesh Arora, and Om Parkash. "Flow Characteristics of Multiphase Glass Beads-Water Slurry through Horizontal Pipeline using Computational Fluid Dynamics." International Journal of Automotive and Mechanical Engineering 16, no. 2 (2019): 6605–23. http://dx.doi.org/10.15282/ijame.16.2.2019.10.0497.

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Over the decades conveying solid particles through pipelines is a prevalent usage for many industries like food industries, pharmaceutical, oil and gas-solid handling, power generations etc. In the present study, slurry flow through 54.9 mm diameter and 4 m long horizontal pipe with solid particle diameter 0.125 mm and specific gravity 2.47 has been numerically analysed using a granular version of Eulerian two-phase model and RNG K- model. The solid particles are considered as mono-dispersed in the Eulerian model. These models are available in computational fluid dynamics (CFD) fluent software

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Suri, Saadat Ullah Khan. "Potential Impact of Computational Techniques to Express the Solid Dynamics in (Gas-Liquid-Solid) Multiphase Reactors." NUST Journal of Engineering Sciences 11, no. 2 (2018): 63–70. http://dx.doi.org/10.24949/njes.v11i2.504.

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The computational fluid dynamics codes play a paramount role by demonstrating the system dynamics. The solid dynamics in a multiphase reactor can be analysed from (Chaos, Fractures, Clustering Discrete Element and Eulerian-Langrangian) simulation methods. The Chaos analysis is studied from pressure variation and time series. It includes the characterization of the flow region and their transition. The correlation dimension from the gas phase will describe the scale behaviour in the Chaos analysis. An effective flow model with definite investigation is obtained from this analysis. The flow regi

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Sugiharto, S., R. Kurniadi, Z. Abidin, Z. Stegowski, and L. Furman. "Prediction of Separation Length of Turbulent Multiphase Flow Using Radiotracer and Computational Fluid Dynamics Simulation." Atom Indonesia 39, no. 1 (2013): 32. http://dx.doi.org/10.17146/aij.2013.221.

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Hemmingsen, Casper Schytte, Stefan Lemvig Glimberg, Nathan Quadrio, et al. "Multiphase coupling of a reservoir simulator and computational fluid dynamics for accurate near-well flow." Journal of Petroleum Science and Engineering 178 (July 2019): 517–27. http://dx.doi.org/10.1016/j.petrol.2019.03.063.

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Yan, Di, Qian Tang, Ahmed Kovacevic, Sham Rane, and Linqing Pei. "Rotor profile design and numerical analysis of 2–3 type multiphase twin-screw pumps." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 232, no. 2 (2017): 186–202. http://dx.doi.org/10.1177/0954408917691798.

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Increasing demands for high-performance handling of fluids in oil and gas as well as other applications require improvements of efficiency and reliability of screw pumps. Rotor profile plays the key role in the performance of such machines. This paper analyses difference in performance of 2–3 lobe combination of twin-screw pumps with different rotor profiles. A-type profile formed of involute–cycloid curves and D-type formed of cycloid curves are typical representatives for 2–3 type screw pumps. The investigation is performed by use of a full 3-D computational fluid dynamics analysis based on

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Pourtousi, M., Mohammadjavad Zeinali, P. Ganesan, and J. N. Sahu. "Prediction of multiphase flow pattern inside a 3D bubble column reactor using a combination of CFD and ANFIS." RSC Advances 5, no. 104 (2015): 85652–72. http://dx.doi.org/10.1039/c5ra11583c.

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This work presents a combination of Computational Fluid Dynamics (CFD) and Adaptive Network-based Fuzzy Inference System (ANFIS) developed for flow characterization inside a cylindrical bubble column reactor.

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Meyer, M., and R. Lupoi. "An analysis of the particulate flow in cold spray nozzles." Mechanical Sciences 6, no. 2 (2015): 127–36. http://dx.doi.org/10.5194/ms-6-127-2015.

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Abstract. Cold Spray is a novel technology for the application of coatings onto a variety of substrate materials. In this method, melting temperatures are not crossed and the bonding is realized by the acceleration of powder particles through a carrier gas in a converging-diverging nozzle and their high energy impact over a substrate material. The critical aspect of this technology is the acceleration process and the multiphase nature of it. Three different nozzle designs were experimented under constant conditions and their performance simulated using Computational Fluid Dynamics tools. The D

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Wong, Chong Yau, Amir Zamberi, Amira Shaffee, Zurita Johar, Maharon Jadid, and Joan Boulanger. "Multiphase sand erosion in standard elbows." APPEA Journal 55, no. 1 (2015): 371. http://dx.doi.org/10.1071/aj14030.

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Standard elbows are used to redirect multiphase flows in oil and gas facilities. Internal erosion of the pipe walls is expected when produced solids are present in the pipe system. The literature widely documents erosion modelling through empirical and numerical methodologies validated with experimental data on elbow erosion. There are no studies documenting the full internal surface of standard elbows in multiphase flow erosion. This peer-reviewed paper fills that knowledge gap through experimental erosion modelling of standard elbows at various multiphase flow conditions. The results provide

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Zhu, Yuchuan, Zhengyi Jiang, Ling Yan, Yan Li, Fangfang Ai, and Shangshu Li. "Analysis of the multiphase lubricating oil effect on the performance of the tilting-pad journal bearing." Thermal Science 25, no. 3 Part B (2021): 2245–52. http://dx.doi.org/10.2298/tsci200220112z.

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As heavy industry develops, large amounts of tilting-pad journal bearings are widely used in advanced technology and key equipment. So, it has become a hot research direction to ensure the stable operation of tilting-pad journal bearings by using multiphase lubricating oil. The aim of the present research was to clarify whether using the multiphase lubricating oil has a positive effect on the performance of the bearings. The approach is based on computational multiphase fluid dynamics and finite-element method. Reynolds averaged equations of multi-phase flow was applied to computation for impr

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Doroshenko, Yaroslav, Julia Doroshenko, Vasyl Zapukhliak, Lyubomyr Poberezhny, and Pavlo Maruschak. "MODELING COMPUTATIONAL FLUID DYNAMICS OF MULTIPHASE FLOWS IN ELBOW AND T-JUNCTION OF THE MAIN GAS PIPELINE." Transport 34, no. 1 (2019): 19–29. http://dx.doi.org/10.3846/transport.2019.7441.

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The research was performed in order to obtain the physical picture of the movement of condensed droplets and solid particles in the flow of natural gas in elbows and T-junctions of the linear part of the main gas pipeline. 3D modeling of the elbow and T-junction was performed in the linear part of the gas main, in particular, in places where a complex movement of multiphase flows occurs and changes its direction. In these places also occur swirls, collisions of discrete phases in the pipeline wall, and erosive wear of the pipe wall. Based on Lagrangian approach (Discrete Phase Model – DPM), me

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40

Kumar, Amod, Claudio Olmi, Oluwatosin Ogundare, Pranab Jha, and David Bennett. "Detecting Pipeline Anomalies and Variations in Acoustic Velocity in Multiphase Flow Regimes Using Computational Fluid Dynamics." Open Journal of Fluid Dynamics 10, no. 03 (2020): 184–97. http://dx.doi.org/10.4236/ojfd.2020.103012.

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41

Tošić, Marko, Roland Larsson, Janko Jovanović, Thomas Lohner, Marcus Björling, and Karsten Stahl. "A Computational Fluid Dynamics Study on Shearing Mechanisms in Thermal Elastohydrodynamic Line Contacts." Lubricants 7, no. 8 (2019): 69. http://dx.doi.org/10.3390/lubricants7080069.

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Abstract (sommario):

A computational fluid dynamics (CFD) model of the thermal elastohydrodynamically lubricated (EHL) line contact problem has been developed for the purpose of exploring the physical processes that occur inside a thin EHL film subjected to shearing motion. The Navier–Stokes equations are solved by using the finite volume method (FVM) in a commercial CFD software, ANSYS Fluent. A set of user-defined functions (UDF) are used for computing viscosity, density, heat source, temperature of moving surfaces and elastic deformation of the top roller according to well-established equations commonly used in

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42

Vachaparambil, Kurian J., and Kristian Etienne Einarsrud. "Comparison of Surface Tension Models for the Volume of Fluid Method." Processes 7, no. 8 (2019): 542. http://dx.doi.org/10.3390/pr7080542.

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With the increasing use of Computational Fluid Dynamics to investigate multiphase flow scenarios, modelling surface tension effects has been a topic of active research. A well known associated problem is the generation of spurious velocities (or currents), arising due to inaccuracies in calculations of the surface tension force. These spurious currents cause nonphysical flows which can adversely affect the predictive capability of these simulations. In this paper, we implement the Continuum Surface Force (CSF), Smoothed CSF and Sharp Surface Force (SSF) models in OpenFOAM. The models were vali

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43

Yang, D., XQ Lv, and YL Xiong. "A computational fluid dynamics study on the solid mineral particles-laden flow in a novel offshore agitated vessel." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 233, no. 2 (2018): 622–31. http://dx.doi.org/10.1177/1475090218776143.

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Abstract (sommario):

Most seabeds are unexplored and rich in mineral deposits, making offshore mining a promising activity. However, offshore operation brings in great challenges from technical equipment to physical space. For instance, an offshore agitated vessel is supposed to stabilize the solids concentration from the underwater mining and make little impact on the stability of the platform or ship. For this reason, we proposed a novel offshore agitated vessel. The whole system based on the arrangement of the mineral processing platform and the slurry mix flow rate is obtained from the previous design stage. L

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Suri, Saadat Ullah Khan. "Development of Numerical Eulerian-Eulerian Model for Computational Analysis of Potential in Chemical Process Intensification from Trickle Bed Reactors." Pakistan Journal of Analytical & Environmental Chemistry 21, no. 2 (2020): 377–86. http://dx.doi.org/10.21743/pjaec/2020.12.40.

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Abstract (sommario):

The computational fluid dynamics techniques keep a paramount role by evaluating a reactor performance. The transitory performance of a Trickle bed reactor is readily monitored from its three phase’s flow conditions. This research review study corresponds towards the formation of boundaries in this Trickle bed reactors system to designate its comprehensive methodology with an optimized solution. The main paramount significance of computational fluid dynamics techniques is to observe the validity and an effective significance of the experimental result. The catalyst bed is modelled with the help

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Yan, Guanxi, Zi Li, Thierry Bore, Sergio Andres Galindo Torres, Alexander Scheuermann, and Ling Li. "Discovery of Dynamic Two-Phase Flow in Porous Media Using Two-Dimensional Multiphase Lattice Boltzmann Simulation." Energies 14, no. 13 (2021): 4044. http://dx.doi.org/10.3390/en14134044.

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Abstract (sommario):

The dynamic two-phase flow in porous media was theoretically developed based on mass, momentum conservation, and fundamental constitutive relationships for simulating immiscible fluid-fluid retention behavior and seepage in the natural geomaterial. The simulation of transient two-phase flow seepage is, therefore, dependent on both the hydraulic boundaries applied and the immiscible fluid-fluid retention behavior experimentally measured. Many previous studies manifested the velocity-dependent capillary pressure–saturation relationship (Pc-S) and relative permeability (Kr-S). However, those work

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46

Soleimani, Hassan, Hassan Ali, Noorhana Yahya, et al. "Transport Modelling of Multi-Phase Fluid Flow in Porous Media for Enhanced Oil Recovery." Defect and Diffusion Forum 400 (March 2020): 38–44. http://dx.doi.org/10.4028/www.scientific.net/ddf.400.38.

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This article studies the combined effect of spatial heterogeneity and capillary pressure on the saturation of two fluids during the injection of immiscible nanoparticles. Various literature review exhibited that the nanoparticles are helpful in enhancing the oil recovery by varying several mechanisms, like wettability alteration, interfacial tension, disjoining pressure and mobility control. Multiphase modelling of fluids in porous media comprise balance equation formulation, and constitutive relations for both interphase mass transfer and pressure saturation curves. A classical equation of ad

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47

Ali, Asad, Jianping Yuan, Fanjie Deng, et al. "Research Progress and Prospects of Multi-Stage Centrifugal Pump Capability for Handling Gas–Liquid Multiphase Flow: Comparison and Empirical Model Validation." Energies 14, no. 4 (2021): 896. http://dx.doi.org/10.3390/en14040896.

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Abstract (sommario):

The working capability of multi-stage pumps, such as electrical submersible pumps (ESPs) handling multiphase flow, has always been a big challenge for petroleum industries. The major problem is associated with the agglomeration of gas bubbles inside ESP-impellers, causing pump performance degradation ranging from mild to severe deterioration (surging/gas pockets). Previous literature showed that the two-phase performance of ESPs is greatly affected by gas involvement, rotational speed, bubble size, and fluid viscosity. Thus, it is necessary to understand which parameter is actually accountable

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48

Capecelatro, Jesse, Olivier Desjardins, and Rodney O. Fox. "On fluid–particle dynamics in fully developed cluster-induced turbulence." Journal of Fluid Mechanics 780 (September 7, 2015): 578–635. http://dx.doi.org/10.1017/jfm.2015.459.

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Abstract (sommario):

At sufficient mass loading and in the presence of a mean body force (e.g. gravity), an initially random distribution of particles may organize into dense clusters as a result of momentum coupling with the carrier phase. In statistically stationary flows, fluctuations in particle concentration can generate and sustain fluid-phase turbulence, which we refer to as cluster-induced turbulence (CIT). This work aims to explore such flows in order to better understand the fundamental modelling aspects related to multiphase turbulence, including the mechanisms responsible for generating volume-fraction

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49

Xu, Jian Xin, Hua Wang, Jian Jun Wang, Shi Bo Wang, Dao Fei Zhu, and Guo Feng Fan. "CFD Simulation of Mixing Effects in Gas-Liquid-Solid Stirred Reactor." Advanced Materials Research 383-390 (November 2011): 5778–84. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.5778.

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Abstract (sommario):

In order to analyze the complex phase transition in the gas-liquid-solid three-phase mixing systems and to predict gas-liquid-solid multiphase mixing time, a novel method combined image processing technology, computational homology and CFD (Computational Fluid Dynamics) numerical simulation is introduced in this study. Firstly, the volume of fluid (VOF) multiphase flow model in FLUENT software is used for the simulation of fluid characteristics. Secondly the patterns produced by phase transition in the stirred tank are binaryzed. Finally evolution profile of the zeroth dimensional Betti number

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50

Lobsinger, Thomas, Timm Hieronymus, and Gunther Brenner. "A CFD Investigation of a 2D Balanced Vane Pump Focusing on Leakage Flows and Multiphase Flow Characteristics." Energies 13, no. 13 (2020): 3314. http://dx.doi.org/10.3390/en13133314.

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Abstract (sommario):

Vane pumps are often applied in automatic transmission systems of vehicles. Future applications require the oil pumps to be more efficient and to be able to handle multiphase flow pumping situations to a certain extend. To fulfill these requirements, efficient development tools are needed. Therefore, a less demanding computational 2D model of a fixed-type balanced vane pump was derived and numerically analyzed with the commercial computational fluid dynamics (CFD) software ANSYS CFX. The meshing of the rotating parts was done with TwinMesh, using a moving mesh approach. At first, a mesh conver

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