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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 >The effect of the cross-sectional geometry on saturated flow boiling heat transfer in horizontal micro-scale channels
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The effect of the cross-sectional geometry on saturated flow boiling heat transfer in horizontal micro-scale channels

机译：横截面几何对水平微尺度通道饱和流沸热传热的影响

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Highlights?New experimental data for heat transfer coefficient for 3 cross-section geometries in a single microchannel.?Parametrical analysis of the experimental data focusing on the geometry effect.?The triangular channel performed as the best for high heat fluxes.?The experimental data is well predicted by some of the methods from literature.?None of the methods captures adequately the experimental trends for triangular channel.AbstractIn the present paper, convective boiling heat transfer results of R134a for circular, square and triangular tubes are presented. The evaluated channels present the same external perimeter and equivalent diameters of 1.100, 0.977 and 0.835mm, respectively. Experiments were performed for mass velocities ranging from 200 to 800kg/m2s, heat fluxes from 15 to 85kW/m2, saturation temperatures of 31 and 41°C, and vapor qualities from 0.05 to 0.95. In order to perform reasonable comparisons among the test sections, the tests were run under similar mass velocities for the three geometries. The experimental data were carefully analyzed and discussed focusing on the effect of the cross-sectional geometry. It was found that for low heat fluxes, the heat transfer coefficient for the circular channel is higher. While for high heat fluxes, the heat transfer coefficient for the triangular channel is higher than for circular and square channels. Subsequently, the experimental data were compared with predictive methods from literature which are usually developed based only on data for single circular channels. Statistically, Kanizawa et al. [24] and Kim and Mudawar [34] provided reasonable predictions of the overall database. However, none of the methods captured adequately the experimental trends for the triangular channel.]]>
机译：<！[cdata [ 亮点 ？ 在单个微通道中的3个横截面几何形状的传​​热系数的新实验数据。 ？ 参数对几何效应的实验数据分析。 ？ < CE：PARA ID =“P0015”视图=“全部”>三角形通道作为最佳的高热量通量。 ？ 实验数据是我们LL由一些文献中的一些方法预测。 ？ 所有方法都没有充分捕获三角通道的实验趋势。 抽象 在本文中，对流沸腾传热结果提出了圆形，正方形和三角管的R134A。评估的通道分别存在相同的外周边和等效直径为1.100,0.977和0.835mm。对于从200至800kg / m的质量速度进行实验：Sup Loc =“Post”> 2 s，从15至85kw / m ，饱和温度为31和41°C，蒸气质量为0.05至0.95。为了在测试部分进行合理的比较，在三个几何形状的质量速度下运行测试。仔细分析实验数据，并讨论了横截面几何形状的效果。发现对于低热助熔剂，圆形通道的传热系数更高。虽然对于高热量通量，三角形通道的传热系数高于圆形和方形通道。随后，将实验数据与来自文献的预测方法进行了比较，这些方法通常仅基于单圆通道的数据开发。统计上，Kanizawa等人。 [24]和Kim和Mudawar [34]提供了整个数据库的合理预测。然而，这些方法都没有充分捕获三角形通道的实验趋势。 ]]>

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