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1、InternationalJournalofHeatandMassTransfer45(2002)3477–3489www.elsevier.com/locate/ijhmtCharacterizationoffrictionalpressuredropforliquidflowsthroughmicrochannelsJ.Judy,D.Maynes*,B.W.WebbDepartmentofMechanicalEngineering,BrighamYoungUniversity,435CTB,Provo,UT84602,US
2、AReceived10January2002;receivedinrevisedform8February2002AbstractThispaperinvestigatespressuredrivenliquidflowthroughroundandsquaremicrochannelsfabricatedfromfusedsilicaandstainlesssteel.Pressuredropdataareusedtocharacterizethefrictionfactorforchanneldiametersinther
3、ange15–150lmandoveraReynoldsnumberrange8–2300.Distilledwater,methanol,andisopropanolwereusedinthisstudybasedontheirdistinctpolarityandviscosityproperties.DistinguishabledeviationfromStokesflowtheorywasnotobservedforanychannelcross-section,diameter,material,orfluidexp
4、lored.Ó2002PublishedbyElsevierScienceLtd.1.Introductionstantcross-sectionalarea,thepressuredifferentialcanbeexpressedasfollowsFluidflowinmicrotubesandmicrochannelshasqV2LXemergedasanimportantareaofresearch.ThishasbeenDP¼fþKL;ð1Þmotivatedbytheirproposeduseinsuchdive
5、rseappli-2Dcationsasmicropowergeneration,biomedicaluse,computerchips,andchemicalseparationsprocesses.wherefisthefrictionfactor,qisthefluiddensity,VisAdvancesinmicroelectro-mechanicalsystems(MEMS)theaveragevelocity,Listhechannelortubelength,DisPandothermicrotechnolog
6、iesinvolvingfluidtransportthehydraulicdiameter,andKLrepresentsthesumofrequiretheuseofmicrofluidiccomponents,whichareminorlossesduetotheinlet,exit,andhydrodynamicofteninterconnectedbytubesandchannels.Quantifyingdevelopmentlength.Theaboveexpressioncanbesolvedtheflowphys
7、icsofpipeandchannelflowsisthuscriticalforfandtheproductfReisexpressedasinunderstandingthemomentum,heat,andmasspDPD44qQXtransportcharacteristicsatthemicroscale.However,fRe¼KL;ð2Þonlylimitedpriorworkhasappearedintheliterature2QlLpLlexploringpressure-drivenliquidflowst
8、hroughsuchge-ometries,andtheresultsvarywidely.whereQisthefluidvolumetricflowrateandlistheOneofthesimplestmethodsinexploringthevaliditydynamicviscos
