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首页> 外文期刊>International Journal of Refrigeration >Experimental research on heat transfer coefficients for cryogenic cross-counter-flow coiled finned-tube heat exchangers
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Experimental research on heat transfer coefficients for cryogenic cross-counter-flow coiled finned-tube heat exchangers

机译：低温逆流盘旋翅片管换热器传热系数的实验研究

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摘要

The aim of present experimental research is to find out the suitable correlations for designing the coiled finned-tube heat exchangers used in cryogenic applications. In order to conduct above experimental study, cross-counter-flow coiled finned-tube heat exchangers were developed in our lab and used in actual refrigeration cycle. The experiments were conducted in the range of effective Reynolds number 500-1900. The effect of diametrical clearance on the prediction of overall heat transfer coefficient is also investigated experimentally. The results from present study were compared in the form of overall heat transfer coefficient. Results of present experimental research indicate that different correlations selected in the study can be used with reasonable accuracy for designing the coiled finned-tube heat exchangers, if they are applied with suitable method of calculation of free-flow cross-sectional area. A more accurate new correlation has also been proposed that fitted experimental data within ±10% error band.
机译：当前实验研究的目的是找到适合设计低温应用中的盘绕翅片管热交换器的相关性。为了进行上述实验研究，在我们的实验室中开发了横流盘流翅片管换热器，并将其用于实际的制冷循环中。实验在有效雷诺数500-1900的范围内进行。还通过实验研究了径向间隙对总传热系数预测的影响。本研究的结果以总传热系数的形式进行了比较。目前的实验研究结果表明，如果采用适当的自由流动截面积计算方法，则可以合理合理地使用研究中选择的不同相关性来设计螺旋翅片管式换热器。还提出了一种更准确的新相关性，可以在±10％误差带内拟合实验数据。

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