摘要
Naturalconvectionheattransferinahorizontalenclosurefilledwithanisotropicporousmedia,beingisothermallyheatedatbettomandcooledattopwhiletheverticalwallsbeingadiabatic,isnumericallystudiedbyapplyingtheBrinkmanmodel-amodifiedformofDarcymodelgivingconsideratiointotheviscouseffect.Theresultsshowthat:(1)alargerpermeabilityratio(K^*)causesalowerflowintensityintheenclosureandasmallerNusseltnumber,allNusseltnumbersapproachunityinthelimitofK^*→∞;alargerthermalconductivityratio(λ^*)causesastrangerdistortionofisothermsintheenclosureandahigherflowvelocitynearthewalls,alltheNusseltnumbersapproachunityinthelimitofλ^*-→0,thepermeabilityandthermalconductivityratiosgenerallyhaveopposingeffectsontheNusseltnumber.(2)anincreasingDarcynumberdecreasestheflowintensityandheattansferrates,whichismoresignificantatalowerpermeabilityratio.Inparticular,withK^*≤0.25,theNusseltnumberforDa=10^-3woulddifferfromthatofDarcyflowuptoanamountof30%,ananalysisneglectingthenon-Daricaneffectwillinevitablybeofconsiderableerror.
出版日期
1996年02月12日（中国Betway体育网页登陆平台首次上网日期，不代表论文的发表时间）
