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1、Keywords:rotatingcylinder,heattransfer,temperatureandvelocityfield1.INTRODUCTIONRolldryersaretheequipmentusedfordryingofcolloidsolutions,suspensions,viscousliquidsandpastes.Relativelysimpleconstructionandlowspecificenergyconsumptionmakethesedryersveryattractiveforapplicationinchemical,foo
2、dandtextileindustry.IntensiveexchangeofheatandsubstanceinthissystemofdryingisaccomplishedthankstothedryingprincipleTHERESULTSOFEXPERIMENTALbasedonthedirectcontactofheatedrollandwetmaterial.HeattransfersystemsofsuchofkindandRESEARCHCOEFFICIENTANDMODELlikewiseareintroducedinliteratureAihara
3、etal.(1990),HEATTRANSFEROFTHEROTATINGYongandMinkowycz(1989),Songetal.(1991),TolmacCYLINDER(1997),KiwanandZeitoin(2008),Prvulovic,etal.(2007),Raudensky,M.(1993).Dragi?aTOLMA?ThereareveryfewqualityandquantitydatafortheseSlavicaPRVULOVI?dryerswhichcouldenablethecalculationincludingtheLjiljan
4、aRADOVANOVI?coefficientsofheattransfer.Intheliteratureonecanfinddatareferringtothecoefficientofheattransferinvery2widelimitsfrom105to345(W/mK),whichdoesnotAbstract:Thispapercoversresultsofexperimentalandenablethesystemdesignerstomakeprecisecalculation.theoreticalresearchesreferringtothete
5、chniqueofTherefore,furtherresearchisnecessaryinthisareaascontactdrying.Therearegiventhetestsofthesystemwellasfindingoutofnewmodelswhichcouldbeasparametersofthecylinderdryerwiththelayeroftheappropriateaspossibletotheactualcriteria.driedmaterialandwithoutit,onthesurfaceoftherotatingcylinder
6、ofthecontactdryerintheexploitation2.DESCRIPTIONOFEXPERIMENTALconditions.ApplicationofthecontactdryersisrepresentedespeciallyinfoodindustryinplantsforPLANTindustrialprocessingofgrains.Onthebasicsofthetests,thetemperaturefield,thecriteriaequationsweregivenThetestsaredoneontheindustrialplant
7、ofthecylinderwhichcharacterizeheattransferinthedynamicdryer,withthecylinderdiameterd=1220mmandtheconditionsofdryerrollrotation,andtheotherprocesslengthL=3048mm,thatisheatedinsidebysteamvapor.relevantparametersaredetermined.TheschemeoftheindustrialplantisontheFig.1.F
