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1、第36卷第1期制冷學(xué)報Vo1.36,No.12015年2月JournalofRefrigerationFebruary,2015文章編號:0253—4339(2015)01—0070—07doi:10.3969/j.issn.0253—4339.2015.01.070水一甲醇混合工質(zhì)振蕩熱管溫度振蕩及傳熱特性研究徐天瀟崔曉鈺李治華孫慎德(上海理工大學(xué)能源與動力工程學(xué)院上海200093)摘要通過實驗研究了水一甲醇混合工質(zhì)振蕩熱管充液率分別為55%、62%、70%、90%下,體積比分別為13:1、4:1、l:1、1:4、1
2、:13時的溫度振蕩以及熱阻特性,并與水、甲醇純工質(zhì)振蕩熱管進(jìn)行了對比。研究表明,混合工質(zhì)振蕩熱管的振幅較純工質(zhì)大且較為均勻;較大充液率時(62%及以上),大多數(shù)混合工質(zhì)振蕩熱管熱阻大于兩種純工質(zhì);中等充液率時,部分振蕩熱管出現(xiàn)燒干現(xiàn)象,受黏度影響,大多數(shù)混合工質(zhì)振蕩熱管出現(xiàn)燒干現(xiàn)象時的功率較小,熱阻較純工質(zhì)大。但是,在水中加入少量甲醇(13:1)做工質(zhì)的振蕩熱管在充液率為55%下不易發(fā)生燒干,且熱阻較其他工質(zhì)低。振蕩熱管的熱阻特性受工質(zhì)黏度、氣液相平衡等因素的共同作用,在不同工況下,各因素作用效果不同。關(guān)鍵詞傳熱特性;
3、振蕩熱管;混合工質(zhì);實驗分析中圖分類號:TB612;TB657.5文獻(xiàn)標(biāo)識碼:AExperimentalInvestigationonThermalPerformanceofOscillatingHeatPipewithWater/MethanolMixtureasWorkingFluidsXuTianxiaoCuiXiaoyuLiZhihuaSunShende(SchoolofEnergyandPowerEngineering,UniversityofShanghaiforScience&Technology,Sha
4、nghai,200093,China)AbstractAnexperimentalinvestigationwasperformedontheoscillatingcharacteristicsandthermalresistancesoftheoscillatingheatpipe(0HP)withwater/methanolmixtureundervariedmixingratios(i.e.13:1,4:1,1:1,1:4and1:13)andfillingratios(i.e.90%,70%,62%and55%
5、),whichiscomp~edwiththepureworkingmedium,waterandmethano1.Experimentalresultsshowedthattheam—plitudeoftheOHPwithmixturewaslargerthanthepureworkingfluid.Generally,thethermalresistanceoftheOHPwiththemixtureworkingmediumwasmostlyhigherthanthatwithpureonewhenthefill
6、ingratiowasmorethan62%.TheOHPwithmixturewaseasiertodryoutthanthatwithpureone.Whenthefillingratioswere55%,thethermalresistanceoftheOHPwithmixturerisesfaster.Specially,theworkingmediumwithlittlemethanol(13:1)andmuchwaterwasidealbecauseofthehighheatingpowerwhendryo
7、utin55%fillingratio.ThethermalresistanceoftheOHPwasmainlydeterminedbytheviscosityofworkingmedium,phaseequilibriumandSOon.Theprimaryfactorchangesindifferentworkingconditions.Keywordsheattransferperformance;oscillatingheatpipe;mixtureworkingfluids;experimentalinve
8、stigation二十世紀(jì)九十年代,Akachi_1發(fā)明了振蕩熱管,其運行機(jī)理復(fù)雜。振蕩熱管的運行原理可以概括為其導(dǎo)熱能力遠(yuǎn)遠(yuǎn)超過任何已知金屬,且具有結(jié)構(gòu)由于冷熱兩端間存在壓差以及相鄰管間存在壓力不緊湊、熱響應(yīng)快等優(yōu)點,為解決空冷強(qiáng)迫對流微小空平衡,使得工質(zhì)在加熱段和冷凝段之間振蕩流動,從間高熱流密度的散熱問題提供了一種極具前途的