Flow of Liquid Hydrocarbons in Porous Vycor.pdf

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1、JOURNALOFAPPLIEDPHYSICSVOLUME30,NUMBER6JUNE,1959FlowofLiquidHydrocarbonsinPorousVycor*P.DEBYEANDROBERTL.CLELANDtBakerLaboratoryofChemistry,CornellUniversity,Ithaca,NewYork(ReceivedOctober21,1958)ExperimentalinvestigationoftheflowratesofnormalparaffinsinporousVycorglassshowsthattherearedeviationsfr

2、omtheviscositydependencerequiredbyPoiseuille'slaw.Adiscussionoftheapplicationofcapillarymodelstodescribeflowinporousmediaintermsofthemeasuredporosityandsurface-to-volumeratiopointsoutthatsuchmodelsarenotgenerallyapplicable,thoughtheygiveusefulresultsforsomepurposes.Anestimateofthepermeabilitypredi

3、ctedbyPoiseuille'slawismadebyanempiricalmethodwhichusesgasflowmeasurementsintheKnudsenflowregion.TheequationsofslipflowasderivedforgasesdonotexplaintheexperimentaldeviationsfromPoiseuilleflow.TheconceptofaslippingadsorbedlayerofmolecularthicknessatthewallofacapillaryiscombinedwiththeusualPoiseuill

4、etreatmentfortheinteriortogivearesultwhichiscompatiblewithexperiment.INTRODUCTIONInthepresentworkwehavebeenconcernedwiththeviscositydependenceoftheflowofliquidhydrocarbonsMATERIALsuitableforthestudyoftransportApropertiesinverysmallporesistheporousinter•inporousVycorglass.mediateobtainedinthemanufa

5、ctureofVycorglass,EXPERIMENTALasdescribedbyNordberg.1Theprocessconsistsessen•tiallyofleachingoutwithacidthehighalkalicontentThepermeabilitycellwasathimbleofporousVycorphaseofasodium-borosilicateglasswhichhasbeenglasssealedintoanouterjacketasshowninFig.1.Aheatedtoatemperatureatwhichphaseseparationp

6、recision-borecapillarywasattachedtotheinnerpart,takesplace.Theresidualsolidskeletoncontainsaboutwhilealargerdiametersidearmprovidedaccesstothe96%silica.outerchamber.GroundballjointsoncapillaryandsideTheporesleftbyremovalofthealkaliphasemaybearmpermittedreadyconnectiontovacuumandcharacterizedinvari

7、ousways.Studiesofspecificpressure.surfaceareabysmallanglex-rayscatteringgaveaTheouterjacketwasfilledafterevacuationbyusevalueof156m2/gforasinglesample.2Measurementsofareservoirequippedwithaneedlevalve.Theinnerofs