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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental investigation on heat transfer in laminar, transitional and turbulent circular pipe flow
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Experimental investigation on heat transfer in laminar, transitional and turbulent circular pipe flow

机译：层流，过渡和湍流圆管流动传热的实验研究

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摘要

Experimental investigations on heat transfer in a circular pipe for laminar, transitional and turbulent flow are presented. Reliable prediction of heat transfer coefficients for transitional flows is still a challenging task. While methods for predicting laminar and turbulent heat transfer coefficients are widely established in literature, the proposed methods and the validity for calculating according values for the transition region and even the definition of this region itself remains a field of ongoing development. One aspect in this picture is the scarce availability of experimental data on heat transfer coefficients in circular pipe flow for Reynolds numbers in the range of 1000 ＜ Re ＜ 4000, especially for higher Prandtl numbers, i.e. 10 ＜ Pr ＜ 90. Thus, this paper focuses on providing experimental results for heat transfer in circular pipe flow for Reynolds (Re) numbers in the range of 500 ＜ Re ＜ 23000 and 7 ＜ Pr ＜ 41. The test fluid is a water-glycol mixture with a mass fraction of water of x_m = 0.477. The results presented in this paper show good agreement with the widely used calculation methods proposed by Gnielinski in 2013 for laminar, transitional and turbulent flow. The results also confirm the presence of the transition region to occur between 2300 ＜ Re ＜ 4000. 184 data points in the range of 1000 ＜ Re ＜ 4000 are shown, since in this range scarce data are available in literature. In summary 261 heat transfer coefficients for 500 ＜ Re ＜ 23000 and 7 ＜ Pr ＜ 41 are presented, which show good agreement (80.8% are within ±15%) to the cited literature.
机译：提出了在层流，过渡和湍流中圆管传热的实验研究。对于过渡流的传热系数的可靠预测仍然是一项艰巨的任务。尽管在文献中已经广泛地预测层流和湍流传热系数的方法，但是所提出的方法以及根据过渡区域的值甚至该区域本身的定义计算值的有效性仍然是不断发展的领域。该图的一个方面是，对于雷诺数在1000 ＜Re ＜4000范围内的圆管流动传热系数的实验数据缺乏，尤其是对于较高的Prandtl数，即10 ＜Pr ＜90的情况。致力于提供雷诺数（Re）在500 ＜Re ＜23000和7 ＜Pr ＜41范围内的圆管流动传热实验结果。测试流体是水-乙二醇混合物，水的质量分数为x_m = 0.477。本文给出的结果与Gnielinski在2013年提出的层流，过渡和湍流计算方法得到了很好的吻合。该结果还证实了过渡区域存在于2300 ＜Re ＜4000之间。显示了1000 ＜Re ＜4000范围内的184个数据点，因为在该范围内缺乏可用的数据。综上所述，对于500 ＜Re ＜23000和7 ＜Pr ＜41的热传递系数为261，与所引用的文献显示出良好的一致性（80.8％在±15％之内）。

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