Volume 37 Issue 5
May  2022
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WANG Jiahao, XIA Guodong, LI Ran, MA Dandan. Evaporation processes from nanoporous membranes[J]. Journal of Aerospace Power, 2022, 37(5): 1113-1120. doi: 10.13224/j.cnki.jasp.20210247
Citation: WANG Jiahao, XIA Guodong, LI Ran, MA Dandan. Evaporation processes from nanoporous membranes[J]. Journal of Aerospace Power, 2022, 37(5): 1113-1120. doi: 10.13224/j.cnki.jasp.20210247

Evaporation processes from nanoporous membranes

doi: 10.13224/j.cnki.jasp.20210247
  • Received Date: 2021-05-17
  • Publish Date: 2022-05-28
  • Tests were conducted to study the evaporation processes from nanoporous membranes using FC-72.The heat transfer characteristics of two facing directions:membrane facing upward and downward,were compared.Results showed that the heat flux-superheat curves for two directions presented a similar variation trend,and there existed a‘thin film evaporation’ stage where heat flux increased while temperature remained constant.The temperature was stable in low heat flux.The heat transfer performance of downward-facing membrane was better than that of upward-facing membrane at different heat flux levels.This was caused by the effect of gravity on the liquid supply and the effect of liquid film thickness on thermal resistance.As the heat flux increased,the temperature fluctuated more sharply,eventually a temperature peak appeared.The critical heat flux reached 59 W/cm2 and 47 W/cm2 for downward and upward facing membranes,respectively.Additionally,theoretical modeling of the evaporation processes was carried out,and it was found that the evaporation coefficients were 0.043 1 and 0.021 9,respectively.

     

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