Three-dimensional lattice Boltzmann simulations of high density ratio two-phase flows in porous media

Sadeghi, Reza; Shadloo, Mostafa Safdari; Hopp‐Hirschler, Manuel; Hadjadj, A.; Nieken, Ulrich

doi:10.1016/j.camwa.2017.12.028

Cited by 104 publications

(46 citation statements)

References 40 publications

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“…In many problems, the Nu increases by increasing the NF concentration due to the higher thermal conductivity coefficient and heat transfer. However, in this problem, the Nu and heat transfer rate decrease with an increment in the NF concentration, similar to numerous other problems studied so far [10][11][12]18,20]. The Nu reduction over the NF concentration accretion is more considerable for higher Re values.…”

Section: Nusselt Number In the Microchannel With The Circular Cross-ssupporting

confidence: 83%

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The Effect of Nanoparticle Shape and Microchannel Geometry on Fluid Flow and Heat Transfer in a Porous Microchannel

2020

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Microchannels are widely used in electrical and medical industries to improve the heat transfer of the cooling devices. In this paper, the fluid flow and heat transfer of water–Al2O3 nanofluids (NF) were numerically investigated considering the nanoparticle shape and different cross-sections of a porous microchannel. Spherical, cubic, and cylindrical shapes of the nanoparticle as well as circular, square, and triangular cross-sections of the microchannel were considered in the simulation. The finite volume method and the SIMPLE algorithm have been employed to solve the conservation equations numerically, and the k-ε turbulence model has been used to simulate the turbulence fluid flow. The models were simulated at Reynolds number ranging from 3000 to 9000, the nanoparticle volume fraction ranging from 1 to 3, and a porosity coefficient of 0.7. The results indicate that the average Nusselt number (Nuave) increases and the friction coefficient decreases with an increment in the Re for all cases. In addition, the rate of heat transfer in microchannels with triangular and circular cross-sections is reduced with growing Re values and concentration. The spherical nanoparticle leads to maximum heat transfer in the circular and triangular cross-sections. The heat transfer growth for these two cases are about 102.5% and 162.7%, respectively, which were obtained at a Reynolds number and concentration of 9000 and 3%, respectively. However, in the square cross-section, the maximum heat transfer increment was obtained using cylindrical nanoparticles, and it is equal to 80.2%.

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Section: Nusselt Number In the Microchannel With The Circular Cross-ssupporting

confidence: 83%

“…One of the most desirable ways of thermal conductivity coefficient enhancement of the base fluid is adding fine solid particles to the base fluid [1][2][3][4][5][6][7][8][9]. It could also be improved using a porous medium in the channel [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Nanoparticle Shape and Microchannel Geometry on Fluid Flow and Heat Transfer in a Porous Microchannel

2020

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“…In view of Equations (6) and (7), the resulting mathematical model for fluid and particle phase in components from [48] are given as:…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Sheikholeslami et al [6] conducted the study of magnetohydrodynamics nanofluid with heat transfer by employing a two-phase model. Recently, Sadeghi et al [7] investigated porosity effects for the two-phase flow. Significant developments for two-multiphase flows are contained in [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Study of Two-Phase Newtonian Nanofluid Flow Hybrid with Hafnium Particles under the Effects of Slip

et al. 2020

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This paper investigates the role of slip in a two-phase flow of Newtonian fluid. The nano-size Hafnium particles are used in the base fluid. The fluid under consideration is studied for two cases namely (i) fluid phase (ii) phase of particles. Both cases are examined for three types of geometries. The governing equations are simplified in nondimensional form for each phase along with boundary conditions. The resulting equations have been analytically solved to get exact solutions for both fluid and particle phases. Different features of significant physical factors are discussed graphically. The flow patterns have been examined through streamlines.

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“…Ultrafiltration and reverse osmosis are encountered in many industrial and biological processes. Reverse osmotic desalination, glomerular tubular ultrafiltration, transpiration cooling, proximal tubular reabsorption, and the process of blood filtration in an artificial kidney are some examples of these processes [1][2][3][4][5][6][7]. In these processes, the filtering fluid is normally pumped at an elevated pressure through porous-walled channels and tubes.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamical Study of Micropolar Fluid in a Porous-Walled Channel: Application to Flat Plate Dialyzer

Kahshan

Siddiqui

2019

Symmetry

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This article investigates the two-dimensional creeping flow of a non-Newtonian micropolar fluid in a small width permeable channel. Fluid is absorbed through permeable walls at a variable rate. This situation arises in filtration and mass transfer phenomena in industrial and engineering processes. The exact solution of the equations of motion is obtained. Graphs of the velocity profiles and pressure drop reveal the significant impact of the non-Newtonian nature of the micropolar fluid on the flow. The obtained solutions are used to discuss the hydrodynamical aspects of the physiological phenomenon of blood filtration in an artificial kidney, the flat plate dialyzer (FPD). Expressions for finding the ultrafiltration rate and mean pressure drop in an FPD are derived. Ultrafiltration rate and the mean pressure difference in an FPD are computed using derived expressions. A comparison of these with the existing empirical and experimental results shows a good agreement. For certain values of parameters, the derived form of the flow rate reveals that the axial flow rate in an FPD decays exponentially along the membrane length. This is a well-established and admitted result used by several researchers for studying the hydrodynamics of blood flow in renal tubules of kidneys. It is concluded that the presented model can be used to study the hydrodynamical aspects of blood flow in an FPD.

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Three-dimensional lattice Boltzmann simulations of high density ratio two-phase flows in porous media

Cited by 104 publications

References 40 publications

The Effect of Nanoparticle Shape and Microchannel Geometry on Fluid Flow and Heat Transfer in a Porous Microchannel

The Effect of Nanoparticle Shape and Microchannel Geometry on Fluid Flow and Heat Transfer in a Porous Microchannel

Study of Two-Phase Newtonian Nanofluid Flow Hybrid with Hafnium Particles under the Effects of Slip

Hydrodynamical Study of Micropolar Fluid in a Porous-Walled Channel: Application to Flat Plate Dialyzer

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