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1、www.ipan.lublin.pl/int-agrophysicsEffectofthetriticalegrainmoisturecontentonthespontaneousheatingofgrainandonthepressureagainstthesilowallE.KusinskaDepartmentofEngineeringandMachinery,UniversityofAgriculture,Doswiadczalna44,20-236LublinAbstract.Theauthorpresentstheresults
2、ofstudiesonthetemperatureandhorizontalpressureoftriticalegraininamodelsilo.Thestudiesincludedgrainwithaninitialmoisturecontentof13,16and18%w.b.Thegrainstoragedurationwas25days.Thestudyshowedthatgraintemperatureisaffectedbyitsinitialmoisturecontent.Thehighesttemperatureval
3、ueswereobservedingrainwithaninitialmoisturecontentof18%w.b.Also,ahigherinitialmoisturecontentresultsingreaterincreasesinpressure.Keywords:triticale,moisturecontent,silo,heatingINTRODUCTIONTemperatureandmoisturecontentarethemostimportantfactorsaffectinggrainqualityinthecou
4、rseofitsstorage.Seasonalanddiurnalvariationintemperaturehaveanegativeeffectonstoredgrain,causewatermigrationandchangesinitsdistributionwithinthematerialstored.Theaccuratepredictionofmoisturecontentandthetemperatureofgraininstorageisnecessaryfortheeffectivecontroloftheproc
5、essofventilation,appliedtoprovideoptimumstorageconditionsforgrainandtheminimizingofconditionsforinfestationbyinsects[2].Thefreemigrationofwaterdependsonanumberoffactors-thekindandqualityofgraininstorage,thesizeandshapeofthegrain,itstemperature,initialmoisturecontent,andat
6、mosphericconditions.Italsodependsonthedurationofstorage,aswellasonthesorptiveanddiffusivepropertiesofthegrain.Thosefactorscausetheprocessofwatermigrationtobeunstable.Watertendstomigratefromwarmertocoolerareaswithingrainmass.Themigrationrateisfasteringrainwithahighermoistu
7、recontentthanindrygrain[10].EFFECTSOFWATERMIGRATIONINPLANTMATERIALSNumerousauthorshavetriedtodescribethephenomenonofwatermigration.HolmanandCarter[10]studiedtheprocessinoveradozensoybeanvarietieswithdifferentbeansizes.Theyshowedthatwatermigrationtakesplaceinallsoybeanvari
8、eties,whichresultsfromwateraccumulationinhigherlayersofmaterialinstorage.Schmidt[19]conductedexp
