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首页> 外文期刊>Journal of enhanced heat transfer >HEAT TRANSFER AND PRESSURE DROP DURING EVAPORATION OF R-410A IN ALUMINUM EXTRUDED ENHANCED TUBES
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HEAT TRANSFER AND PRESSURE DROP DURING EVAPORATION OF R-410A IN ALUMINUM EXTRUDED ENHANCED TUBES

机译：铝挤出增强管R-410A蒸发过程中的传热和压降

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摘要

The literature shows that axial microfins and spokes are promising means for enhancing evaporation of refrigerants in tubes. However, studies are lacking and available ones are generally limited to large diameter tubes. In this study, evaporation heat transfer and pressure drop tests were performed on four tubes-smooth, helical microfin, axial microfin, and spoke-having 7.0 mm outer diameter for the mass flux from 50 to 250 kg/m(2) s using R-410A. During the test, the heat flux and the saturation temperature were maintained at 3.0 kW/m(2) and 8 degrees C. Above 150 kg/m(2) s, the best heat conductance (h(i)A(i)) enhancement was obtained from the axial microfin tube. At lower mass fluxes, the spoke tube yielded the best enhancement. Possible reasoning is provided based on the flow pattern in each tube. As for the pressure drop, the spoke tube yielded significantly higher pressure drop than other tubes. In addition, the pressure drops of the axial microfin tube were higher than those of the helical microfin tube. With proper selection of the fin height, the axial microfin tube may perfrom better than the helical microfin tube except at a low mass flux. At a low mass flux, where stratified flow prevails, the axial microfin is likely to interrupt peripheral propagation of liquid film and deteriorate the heat transfer.
机译：文献表明，轴向微生物和辐条是提高管中制冷剂蒸发的有希望的装置。然而，缺乏研究并且可用的研究通常限于大直径管。在该研究中，在四管光滑，螺旋微素，轴向微素和辐条上进行蒸发传热和压降试验，并且使用R的质量通量为7.0mm外径。使用R -410A。在测试期间，热通量和饱和温度保持在3.0kw / m（2）和8℃以上的150kg / m（2）s，最佳的热敏（H（i）a（i））从轴向微素管获得增强。在较低的质量通量下，辐条管产生了最佳增强。基于每个管中的流动模式提供可能的推理。至于压降，辐条管的压降比其他管显着更高。另外，轴向微素管的压降高于螺旋微素管的压力下降。 With proper selection of the fin height, the axial microfin tube may perfrom better than the helical microfin tube except at a low mass flux.在低质量焊剂处，其中分层流量普遍，轴向微素可能会中断液体膜的外周传播并劣化热传递。

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