Natural Convective Nanofluid Flows Immersed in Oscillating Magnetic Fields Simulated by a Sub-Continuous Lattice Boltzmann ModelSource: ASME Journal of Heat and Mass Transfer:;2023:;volume( 146 ):;issue: 001::page 11401-1DOI: 10.1115/1.4063575Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Natural convective nanofluid flows immersed in oscillating magnetic fields are simulated with a sub-continuous nondimensional lattice Boltzmann model. The effective electrical conductivity model is built including coupled effects of nanoparticle concentrations and two Knudsen numbers. Effects of directions, frequencies, and strength amplitudes of the magnetic fields are studied in wide ranges of Hartmann numbers (0.1≤Haf,L≤600) and Rayleigh numbers (103≤Raf,L≤107). To achieve higher values of cycle averaged Nusselt numbers Nu¯̂f,L, optimal magnetic directions are along or opposite from the gravity directions. Effects of the magnetic frequency f˜B are negligible, in the conduction dominating lower Rayleigh number regime of Raf,L<104. In the convection dominating regime, Nu¯̂f,L increase with Raf,L in orders of Raf,L0.48 and Raf,L0.45 for vertical and horizontal magnetic directions, respectively, and maximum values of Nu¯̂f,L appear at the optimal magnetic frequency of f˜B=1/5cs*MaL(L/UL) for all magnetic directions. With Raf,L as high as 106, the oscillating amplitudes of the transient wall mean Nusselt numbers Nu¯f,L increase with increasing Haf,L, but the cycle averaged Nusselt numbers Nu¯̂f,L decrease from 9.35 to 1.42 with increasing Haf,L in the transient regime of 5≤Haf,L≤500. Meanwhile, heat transfer patterns transit back from convection to conduction dominating patterns with increasing Haf,L, as illustrated by transient streamlines and isotherms.
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contributor author | Sui, Pengxiang | |
contributor author | Su, Yan | |
contributor author | Sun, Liyong | |
date accessioned | 2024-04-24T22:28:15Z | |
date available | 2024-04-24T22:28:15Z | |
date copyright | 10/18/2023 12:00:00 AM | |
date issued | 2023 | |
identifier issn | 2832-8450 | |
identifier other | ht_146_01_011401.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4295279 | |
description abstract | Natural convective nanofluid flows immersed in oscillating magnetic fields are simulated with a sub-continuous nondimensional lattice Boltzmann model. The effective electrical conductivity model is built including coupled effects of nanoparticle concentrations and two Knudsen numbers. Effects of directions, frequencies, and strength amplitudes of the magnetic fields are studied in wide ranges of Hartmann numbers (0.1≤Haf,L≤600) and Rayleigh numbers (103≤Raf,L≤107). To achieve higher values of cycle averaged Nusselt numbers Nu¯̂f,L, optimal magnetic directions are along or opposite from the gravity directions. Effects of the magnetic frequency f˜B are negligible, in the conduction dominating lower Rayleigh number regime of Raf,L<104. In the convection dominating regime, Nu¯̂f,L increase with Raf,L in orders of Raf,L0.48 and Raf,L0.45 for vertical and horizontal magnetic directions, respectively, and maximum values of Nu¯̂f,L appear at the optimal magnetic frequency of f˜B=1/5cs*MaL(L/UL) for all magnetic directions. With Raf,L as high as 106, the oscillating amplitudes of the transient wall mean Nusselt numbers Nu¯f,L increase with increasing Haf,L, but the cycle averaged Nusselt numbers Nu¯̂f,L decrease from 9.35 to 1.42 with increasing Haf,L in the transient regime of 5≤Haf,L≤500. Meanwhile, heat transfer patterns transit back from convection to conduction dominating patterns with increasing Haf,L, as illustrated by transient streamlines and isotherms. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Natural Convective Nanofluid Flows Immersed in Oscillating Magnetic Fields Simulated by a Sub-Continuous Lattice Boltzmann Model | |
type | Journal Paper | |
journal volume | 146 | |
journal issue | 1 | |
journal title | ASME Journal of Heat and Mass Transfer | |
identifier doi | 10.1115/1.4063575 | |
journal fristpage | 11401-1 | |
journal lastpage | 11401-13 | |
page | 13 | |
tree | ASME Journal of Heat and Mass Transfer:;2023:;volume( 146 ):;issue: 001 | |
contenttype | Fulltext |