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简介：Thestudyoffrictionalpropertiesofhumanskinisimportantformedicalresearch,skincareproductsandtextileexploi-tation.Inordertoinvestigatetheinfluenceofnormalloadandslidingspeedonthefrictionalpropertiesofskinanditspossiblemechanism,testswerecarriedoutonamulti-specimenfrictiontester.Whenthenormalloadincreasesfrom0.1Nto0.9N,normaldisplacementandthefrictioncoefficientofskinincrease.Thefrictioncoefficientisdependentontheload,indicatingthatbothadhesionanddeformationcontributetothefrictionbehaviour.Thedeformationfrictionwasinterpretedusingtheploughmodeloffriction.Whenslidingspeedincreasesfrom0.5mm·s?1to4mm·s?1,thefrictioncoefficientincreasesand'stick-slip'phenomenaincrease,indicatingthathystereticfrictioncontributestothefriction.Thehystereticfrictionwasin-terpretedusingschematicofenergytranslationduringtherigidsphericalprobeslidingonthesoftskinsurface,whichprovidesanexplanationfortheinfluenceoftheslidingspeedonthefrictionalcharacteristicsoftheskin.

简介：Fingeringphenomenaarecommonoccurrenceinthenaturalworld.Itgenerallytakesplacewhenalessviscousfluiddisplacesamoreviscousfluidtypicallyinporousmedia.Nowadays,suchphenomenahaveextensivelybeenstudiedduetoitsimportanceinmanyindustrialfields.Inthispaper,theeffectsofsurfacewettabilityonfingerpatternarestudiedandsimulatednumericallybytheLatticeBoltzmannmethod(LBM).Thedisplacementefficiencyisinvestigatedbyusingtwoparameters,namely,thebreakthroughtimeandthearealsweepefficiency.Thesimulationhasdemonstratedthatsurfacewettabilitywillinfluencethefingerpatternnomatterthegravityisconsideredornot,butinthepresenceofgravity,thefingerpatternismuchmorecomplicatedandirregularduetothecoexistenceandcompetitionofcapillaryforce,viscousforceandgravity.

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