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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Water flow boiling heat transfer in vertical minichannel
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Water flow boiling heat transfer in vertical minichannel

机译：垂直迷你宣传中的水流沸腾热传递

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摘要

In recent years, microchannel water flow boiling has demonstrated excellent heat removal capabilities, particular for nuclear reactor safety utilities, ranging from mini-scale cooling devices to chemical industry plant purposes. Of particular interest is cooling technology using water as the primary refrigerant. This paper presents the results of an experimental investigation into the water boiling heat transfer in a minichannel conduit vertically oriented with the upward flow. The test section was a circular minichannel tube made of stainless steel with a 2.12 mm inner diameter. To observe the flow regime, the test section was equipped with sight tubes made of transparent perfluoroalkoxy alkane resin and Pyrex glass at the inlet and outlet, respectively. Water flow boiling experiments were conducted at a saturation temperature of approximately 100 degrees C, with the mass flux of water as the working fluid from 20 to 120 kg/m(2).s, and the average vapor quality in the test section inlet of approximately 0.05 to 0.9. The predicted two-phase flow regimes at the test section were classified as three patterns, namely slug, annular, and churn flows, using a flow pattern map with the vapor quality as the abscissa versus the mass velocity as the ordinate. The flow patterns were confirmed and visualized by observations at the test section outlet sight tube. The characteristics of the heat transfer and fluid flow were analyzed. Moreover, the forced convective heat transfer coefficient and pressure drop in the test section were determined based on the experimental data. The highest mass flux yielded the highest convective heat transfer coefficient. Despite this significant heat transfer coefficient improvement, the pressure loss was higher than that for a higher mass flux, indicating that the pressure loss was more pronounced owing to the presence of the minichannel at a higher mass flux.
机译：近年来，微通道水流沸腾已经证明了优异的散热能力，特别是核反应堆安全实用程序，从迷你尺度冷却装置到化学工业植物的目的。特别感兴趣的是使用水作为主要制冷剂的冷却技术。本文呈现了在垂直定向的垂直定向的垂直定向的迷你通道导管中的实验研究结果。试验部分是由不锈钢制成的圆形扬声器管，内径为2.12mm。为了观察流动状态，试验部分配备有由透明全氟烷氧基烷烃树脂和入口和出口的Pyrex玻璃制成的视线管。水流沸腾实验在约100℃的饱和温度下进行，用20至120kg / m（2）的工作流体的质量通量为0至120kg / m（2）。和测试部入口的平均蒸汽质量大约0.05至0.9。测试部分的预测的两相流动制度被归类为三个图案，即SLUG，环形和搅拌流，使用具有蒸汽质量的流动模式图作为横坐标与质量速度为纵坐标。通过试验部分出口瞄准管的观察来确认和可视化流动模式。分析了传热和流体流动的特征。此外，基于实验数据确定了测试部分中的强制对流传热系数和压降。最高质量磁通量产生最高的对流传热系数。尽管具有这种显着的传热系数改善，但压力损失高于较高质量通量的压力损失，表明由于在较高质量通量下存在百分比的存在，压力损失更加明显。

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