简介：Acomputercode,ELANEX,includingseveralHomogenous-Equilibrium-Model(HEM)typecavitationmodels,weredeveloped,tonumericallysimulatenaturalcavitationphenomena.Theeffectivenessofthecodewascheckedbycavitationflowsaroundthediskandcylinderbodyforawiderangeofdifferentcavitationnumbers.Cavityprofileswerecomparedwiththeanalyticsolutionofdiskandempiricalformulaefittedfromtheexperimentdata,andcontrastbetweendifferentcavitationmodelswerefulfilledaswell.Thecavitylengthandmaximalcavitydiameterwerefoundtoagreewellwiththeanalyticsolutions,anddetailedcavityprofileswereinaccordancewiththeexperimentalformula.Comparisonwiththehemisphereheadedcylinderbodypresentedagoodagreementofthepressurecoefficientwiththeexperimentdata.Reasonabledrag-forcecoefficientvariationanddrag-forcereductioneffectwereobtained.

简介：Thispaperstudieswaterandsolutetransportinsoil.ItmainlydealswiththeadsorptionbehaviorofheavymetalCd++insoilatdifferentPHvaluesandthedynamiccharac-tersofadsorptionprocessinunsaturatedstate.Throughtheoreticalanalysisandexperimentalre-search,theadsorptionisothermandtheequationsofdynamicadsorptioninsaturatedandunsatu-ratedstatesareproposed.