Effect of Lubricant Oil on Flow Boiling Heat Transfer Characteristics of R32 in a Horizontal Multiport Tube

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  • EDA Hikaru
    Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology
  • KIKUCHI Shogo
    School of Marine Electronics and Mechanical Engineering, Tokyo University of Marine Science and Technology
  • JIGE Daisuke
    Tokyo University of Marine Science and Technology
  • INOUE Norihiro
    Tokyo University of Marine Science and Technology
  • KOYAMA Shigeru
    Tokyo University of Marine Science and Technology

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Other Title
  • R32 の水平扁平多孔管内沸騰熱伝達に及ぼす潤滑油の影響
  • R32 ノ スイヘイ ヘンペイ タコウカン ナイ フットウ ネツ デンタツ ニ オヨボス ジュンカツユ ノ エイキョウ

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<p>This study experimentally investigated the effects of lubricant oil on flow boiling heat transfer and pressure drop characteristics of R32 in a horizontal multiport tube with circular mini-channels (Dh = 0.81 mm). The heat transfer coefficients and pressure drops of R32 pure refrigerant and R32+oil mixture with oil concentration of 3.7 wt% were measured for the boiling flow with the mass velocities of 50–400 kgm-2s-1, heat fluxes of 5–40 kWm-2, and at a saturation temperature of 15 °C. The boiling heat transfer coefficient of R32+oil mixture increased at higher heat flux and lower quality regions compared with that of R32. Further, the heat transfer coefficient of the mixture decreased in the higher quality region, and it also decreased in the lower vapor velocity and lower heat flux conditions where thin liquid film evaporation was dominant. The frictional pressure drops of R32+oil mixture were 30–80% higher compared with that of R32 and increased with increasing heat flux in the lower quality and higher mass velocity condition.</p>

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