高温平板水雾冷却换热系数的数值分析-豆柴文库

您所在位置：网站首页 / 高温平板水雾冷却换热系数的数值分析.docx / 文档详情

在线预览结束，喜欢就下载吧，查找使用更方便

5 金币

下载文档

/ 2

下载提示

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

文本预览

高温平板水雾冷却换热系数的数值分析
Introduction
High-temperatureindustrialprocessesoftengeneratealargeamountofwasteheatthatmustbedissipatedefficientlytoensureasafeworkingenvironmentandpreventequipmentfailures.Air-basedcoolingtechniquesareoftenemployedbutcanhavelimitationsintermsofcoolingcapacityandefficiency.Water-basedcoolingtechniqueslikespraycoolingcanbemuchmoreeffectiveatdissipatingwasteheat,especiallywhenthewaterissprayedontoaflatsurfacelikeaplate.Here,wewillanalyzetheheattransfercapabilitiesofthehigh-temperatureplatspraycoolingprocess.
Heattransfercoefficients
Theheattransfercoefficientmeasurestherateofheattransferperunitsurfacearea.Forflatspraycooling,thecoefficientistypicallydeterminedbythefollowingfactors:
-Spraydensity:Theamountofwatersprayedontotheplateperunittime
-Sprayvelocity:Thespeedatwhichthewaterissprayedontotheplate
-Platetemperature:Thetemperatureoftheplatebeingcooled
-Watertemperature:Thetemperatureofthewaterbeingsprayed
Theheattransfercoefficientcanbecalculatedusingempiricalcorrelationsobtainedfromexperimentaldata.OnesuchcorrelationistheRohsenowcorrelation,whichrelatestheheattransfercoefficienttotheReynoldsnumber(adimensionlessquantitymeasuringtheratioofinertialforcestoviscousforces),spraydensity,sprayvelocity,andwatertemperature.OthercorrelationsliketheGnielinskicorrelationmayalsobeusefulinmodelingtheheattransferprocess.
Numericalanalysis
Numericalanalysisinvolvesusingmathematicalmodelingandsimulationtechniquestostudyphysicalphenomena.Inthecaseofhigh-temperatureflatspraycooling,wecanusenumericalanalysistostudytheheattransferprocessunderdifferentconditions.Thiscanhelpusoptimizethecoolingprocessanddeterminethemostefficientoperatingparameters.
Onecommonnumericaltechniqueusedforsimulatingheattransferprocessesisthefiniteelementmethod(FEM).FEMinvolvesdividingtheplateintoagridofsmallelementsandthenusingequationstomodeltheheattransferbetweenadjacentelements.Thisallowsustosimulatetheheattransferprocessingreatdetail,takingintoaccountfactorslikenon-uniformtemperaturedistr