R32在水平光管微肋管內(nèi)流動沸騰換熱特性實(shí)驗(yàn)研究

R32究R32在水平光管微肋管內(nèi)的流動沸騰換熱特性。通過實(shí)R32的沸騰熱傳系數(shù)和流體流動狀態(tài)分布。實(shí)驗(yàn)結(jié)果R32的沸騰熱傳系數(shù)受微肋管加熱面積比和質(zhì)量流量影SR32在TheflowboilingheattransfercharacteristicsofR32inhorizontalmicrofintubewerestudiedinthispaper.Throughexperimentsandanalysis,theboilingheattransfercoefficientandfluidflowstatedistributionofR32wereobtained.TheexperimentalresultsshowthattheboilingheattransfercoefficientofR32inthemicrofintubeisgreatlyaffectedbytheheatingsurfacearearatioandmassflowrate,andpresentsachangesimilartoanS-curvewiththetubelength.Atthesametime,theflowstateofR32inthemicrofintubeexhibitsaflowstatetransitionphenomenon,andthetransitionpointisrelatedtotheheatingsurfacearearatioandmassflowrateofthemicrofintube.Theresearchresultscanprovidereferenceforthemechanismandengineeringapplicationofboilingheattransferinmicrofintubes.Keywords:R32;microfintube;boilingheattransfercoefficient;flowstate;flowstatetransitionR32器采用電熱絲加熱方式，電源通過溫控儀控制。流量計(jì)采用渦街流量計(jì)，壓力計(jì)采用壓阻式壓力傳感器，溫度計(jì)采用熱電偶。微觀攝像系統(tǒng)采用R32在微肋管內(nèi)的沸R32沸騰熱傳系數(shù)的兩個重要參數(shù)。在一定的微肋管R32在微肋管內(nèi)存在流態(tài)轉(zhuǎn)變的現(xiàn)象。當(dāng)微肋管加熱面積比和質(zhì)量流量分別為0.3和50kg/m2.s時，流體流動狀態(tài)出現(xiàn)了從中心對稱流到偏心流的轉(zhuǎn)變。而0.570kg/m2.sR32在水平光管微肋管內(nèi)的流動沸騰換熱特性。通R32的沸騰熱傳系數(shù)和流體流動狀態(tài)分布。實(shí)驗(yàn)R32的沸騰熱傳系數(shù)受微肋管加熱面積比和質(zhì)量流量影響較大，且與管道長度呈現(xiàn)出類似于S曲線的變化規(guī)律。同時，R32在微肋管內(nèi)的流動狀態(tài)存在流態(tài)轉(zhuǎn)變的現(xiàn)象，且轉(zhuǎn)變點(diǎn)與微肋管加韓亞光微細(xì)結(jié)構(gòu)管內(nèi)沸騰研究的實(shí)驗(yàn)和理論[J河海大學(xué)學(xué)報(bào):自然科學(xué)版,2008,36(02):153-157.Zheng,J.,Legros,R.,&Beyene,A.(2011).Flowboilingheattransferinmicrofintubeswithrectangularandcircularfins.Internationaljournalofheatandmasstransfer,54(1-3),83-89.Sui,H.,Luk,V..,&Xia,X.(2019).Flow