MHD Stagnation-Point Flow towards a Stretching SheetMHDwith Prescribed Surface Heat Flux驻点流向拉伸薄板 管理规定的表面热流.pdf

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1、SainsMalaysiana40(10)(2011):1193–1199MHDStagnation-PointFlowtowardsaStretchingSheetwithPrescribedSurfaceHeatFlux(AliranTitikGenanganMHDterhadapHelaianMeregangdenganFluksHabaPermukaanDitetapkan)ANUARISHAK*,ROSLINDANAZAR,NORIHANM.ARIFIN,FADZILAHM.ALI&IOANPOPABSTRACTThesteadytwo-dimensiona

2、lstagnationpointflowofanincompressibleviscousandelectricallyconductingfluid,subjecttoatransverseuniformmagneticfield,towardsastretchingsheetisinvestigated.Thegoverningsystemofpartialdifferentialequationsaretransformedtoordinarydifferentialequations,whicharethensolvednumericallyusingafin

3、itedifferenceschemeknownastheKeller-boxmethod.Theeffectsofthegoverningparametersontheflowfieldandheattransfercharacteristicsareobtainedanddiscussed.Itisfoundthattheheattransferrateatthesurfaceincreaseswiththemagneticparameterwhenthefreestreamvelocityexceedsthestretchingvelocity,i.e.ε>1,

4、andtheoppositeisobservedwhenε<1.Keywords:Heattransfer;magnetohydrodynamic;stagnationpointflow;stretchingsurfaceABSTRAKAlirantitikgenanganmantapduamatrabagibendalirlikattaktermampatkandanpengkonduksielektrikterhadaphelaianmeregangtertaklukkepadamedanmagnetmelintangseragamdiselidik.Sistem

5、menaklukpersamaanpembezaanseparadijelmakankepadapersamaanpembezaanbiasa,yangkemudiannyadiselesaikansecaraberangkamenggunakanskimbezaterhinggadikenalisebagaikaedahkotakKeller.Kesanparameter-parametermenaklukterhadapmedanalirandanciri-ciripemindahanhabadiperolehdandibincangkan.Didapatibah

6、awakadarpemindahanhabapadapermukaanmeningkatdenganpeningkatanparametermagnetapabilahalajualiranbebasmelebihihalajuregangan,iaituε>1,dankeputusanyangbertentangandiperhatikanapabilaε<1.Katakunci:Alirantitikgenangan;magnetohidrodinamik;pemindahanhaba;permukaanmeregangINTRODUCTIONheattransf

7、eroverastretchingsurfacewithvariablesurfaceThefluiddynamicsduetoastretchingsurfaceisimportantheatfluxhasbeenconsideredbyCharandChen(1988),inmanufacturingprocesses.ExamplesarenumerousandLinandChen(1998),Elbashbeshy(1998),Ishaketal.theyincludetheaerodynamicextrusionofplasticsheet