不同环境工况下表面润湿性及外加磁场对结霜影响的实验研究

Experimental study oneffect of magnetic field and surface wettability on frostin under different environmental conditions

中文关键词: 结霜，磁场，表面特性，传热，相变，温湿度

英文关键词: frost  magnetic field  surface characteristics  heat transfer  phase transition  temperature and humidity

中文摘要:

      对不同润湿性表面及外加磁场的结霜过程受冷表面温度(tw)和环境相对湿度(ϕ)的影响进行了微观 可视化研究,结合机理分析对比了在tw=-10.0℃和tw=-35.0℃、ϕ=65%和ϕ=90%工况下不同强度磁 场和不同接触角表面上结霜形态、霜层厚度、结霜质量和密度的变化规律。研究显示,相比高温低湿工况,低 温高湿工况下结霜进程加快,结霜前期水珠凝结合并阶段缩短400s左右。结果表明:随着tw 的降低和空气 ϕ 的增大,磁场和表面特性对结霜过程的影响减弱;tw 和空气ϕ 对疏水表面抑霜效果的影响要大于对磁场抑 霜效果的影响,且影响程度随着表面接触角和磁场强度的增大而增大。

英文摘要:

      Thefrostprocessesondifferentwettabilitysurfacesaremicroscopicallyvisualizedapplying magneticfieldunderdifferentconditions.Thefrostmorphology,frostlayerthickness,frostmassand densitychangecharacteristicson different wettability surfacesareanalyzed with cold surface temperature(tw)-10.0 ℃ and-35.0 ℃,ambientrelativehumidity (ϕ)65% and90% under differentmagneticintensity.Theresultsshowthatcomparedwiththatunderthehightemperature andlowhumidityconditions,thefrostingprocessisacceleratedunderthelowtemperatureandhigh humidityconditions,andthetimeofcondensationandcoalescenceofwaterdropletsintheearlystage isshortenedbynearly400s.Withthedecreaseofcoldsurfacetemperatureandtheincreaseofair humidity,theinfluencesofmagneticfieldandsurfacecharacteristicsonfrostingprocessdecrease.For thehydrophobicsurface,thefrostinhibitioneffectismoreinfluencedbytwandϕthanbymegnetic field.Andthedegreeisstrengthenedwithriseofmegneticstrengthandcontactangel.