Hydromagnetic Double-diffusiveConvection In A Porous Medium With Opposing Temperature And Concentration Gradients
碩士 === 國立中央大學 === 機械工程研究所 === 92 === The problem of hydromagnetic double-diffusive convective flow of a binary mixture in a porous rectangular enclosure is solved numerically in this work. The effects of viscosity and inertial force of the porous medium are considered. The upper and lower walls are...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Others |
Language: | zh-TW |
Published: |
2004
|
Online Access: | http://ndltd.ncl.edu.tw/handle/12754919237658553592 |
id |
ndltd-TW-092NCU05489093 |
---|---|
record_format |
oai_dc |
spelling |
ndltd-TW-092NCU054890932015-10-13T13:04:44Z http://ndltd.ncl.edu.tw/handle/12754919237658553592 Hydromagnetic Double-diffusiveConvection In A Porous Medium With Opposing Temperature And Concentration Gradients 雙重溫度與濃度梯度下多孔性介質中磁流體之雙擴散對流現象 Chia-Lin Tzeng 曾家麟 碩士 國立中央大學 機械工程研究所 92 The problem of hydromagnetic double-diffusive convective flow of a binary mixture in a porous rectangular enclosure is solved numerically in this work. The effects of viscosity and inertial force of the porous medium are considered. The upper and lower walls are insulated. Constant temperatures and concentrations are imposed along the left and right walls of the porous enclosure and a uniform magnetic field is applied in the x-direction. The buoyancy ratio is in the range of 0.0~2.0, Prandtl number in 1.0~5.0, Lewis number in 0.1~2.0, Rayleigh number in 105~107, Darcy number in 10-5~10-1, porosity in 0.2~0.8 and the enclosure aspect ratio is fixed at 2.0. Results for various conditions were presented and discussed. It is found that the flow structure and heat transfer characteristics inside the enclosure depend strongly on the porosity, permeability, the magnetic field, the effect of buoyancy and the thermal inertia. The effect of the magnetic field is found to reduce the movement of the convection within the enclosure. For the unsteady case, the flow oscillates periodically at high Rayleigh number and high heat capacity ratio. The application of magnetic field reduces the oscillation. Finally, this work provides correlations of the Nusselt number vs. porosity and the Hartmann number. Chung-Jen Tseng 曾重仁 2004 學位論文 ; thesis 113 zh-TW |
collection |
NDLTD |
language |
zh-TW |
format |
Others
|
sources |
NDLTD |
description |
碩士 === 國立中央大學 === 機械工程研究所 === 92 === The problem of hydromagnetic double-diffusive convective flow of a binary mixture in a porous rectangular enclosure is solved numerically in this work. The effects of viscosity and inertial force of the porous medium are considered. The upper and lower walls are insulated. Constant temperatures and concentrations are imposed along the left and right walls of the porous enclosure and a uniform magnetic field is applied in the x-direction. The buoyancy ratio is in the range of 0.0~2.0, Prandtl number in 1.0~5.0, Lewis number in 0.1~2.0, Rayleigh number in 105~107, Darcy number in 10-5~10-1, porosity in 0.2~0.8 and the enclosure aspect ratio is fixed at 2.0.
Results for various conditions were presented and discussed. It is found that the flow structure and heat transfer characteristics inside the enclosure depend strongly on the porosity, permeability, the magnetic field, the effect of buoyancy and the thermal inertia. The effect of the magnetic field is found to reduce the movement of the convection within the enclosure.
For the unsteady case, the flow oscillates periodically at high Rayleigh number and high heat capacity ratio. The application of magnetic field reduces the oscillation.
Finally, this work provides correlations of the Nusselt number vs. porosity and the Hartmann number.
|
author2 |
Chung-Jen Tseng |
author_facet |
Chung-Jen Tseng Chia-Lin Tzeng 曾家麟 |
author |
Chia-Lin Tzeng 曾家麟 |
spellingShingle |
Chia-Lin Tzeng 曾家麟 Hydromagnetic Double-diffusiveConvection In A Porous Medium With Opposing Temperature And Concentration Gradients |
author_sort |
Chia-Lin Tzeng |
title |
Hydromagnetic Double-diffusiveConvection In A Porous Medium With Opposing Temperature And Concentration Gradients |
title_short |
Hydromagnetic Double-diffusiveConvection In A Porous Medium With Opposing Temperature And Concentration Gradients |
title_full |
Hydromagnetic Double-diffusiveConvection In A Porous Medium With Opposing Temperature And Concentration Gradients |
title_fullStr |
Hydromagnetic Double-diffusiveConvection In A Porous Medium With Opposing Temperature And Concentration Gradients |
title_full_unstemmed |
Hydromagnetic Double-diffusiveConvection In A Porous Medium With Opposing Temperature And Concentration Gradients |
title_sort |
hydromagnetic double-diffusiveconvection in a porous medium with opposing temperature and concentration gradients |
publishDate |
2004 |
url |
http://ndltd.ncl.edu.tw/handle/12754919237658553592 |
work_keys_str_mv |
AT chialintzeng hydromagneticdoublediffusiveconvectioninaporousmediumwithopposingtemperatureandconcentrationgradients AT céngjiālín hydromagneticdoublediffusiveconvectioninaporousmediumwithopposingtemperatureandconcentrationgradients AT chialintzeng shuāngzhòngwēndùyǔnóngdùtīdùxiàduōkǒngxìngjièzhìzhōngcíliútǐzhīshuāngkuòsànduìliúxiànxiàng AT céngjiālín shuāngzhòngwēndùyǔnóngdùtīdùxiàduōkǒngxìngjièzhìzhōngcíliútǐzhīshuāngkuòsànduìliúxiànxiàng |
_version_ |
1717731017446391808 |