简介：AsimilarityequationforheattransferonheatsourceelementssituatedintheentranceregioninelectronicequipmentisdevelopedbasedontheexperimentaldataobtainedbySparrowetal.^[4].ThecharacteristicofthesimilarityequationisthattheratiooftheheattransfercoefficientattheentranceregiontothatatthefullydevelopedregionisindependentoftheReynoldsnumber.Itdependsonlyontherownumberoftheelementssituatedintheentranceregion.Anexampleoftheusefulnessofthesimilarityequationispresentedthatdeterminestheheattransferonheatsourceelementsinapowerunitthatcontainsonlyasmallnumberoftheheatsourceelements.
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