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首页> 外文期刊>International Journal of Heat and Mass Transfer >Investigation of natural-convection heat transfer coefficient on a vertical square fin of finned-tube heat exchangers
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Investigation of natural-convection heat transfer coefficient on a vertical square fin of finned-tube heat exchangers

机译：翅片管换热器垂直方翅片自然对流换热系数的研究

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摘要

The finite difference method in conjunction with the least-squares scheme and the experimental temperature data is proposed to predict the average natural-convection heat transfer coefficient and the fin efficiency on a vertical square fin of one-circular tube plate finned-tube heat exchangers. In the present study, the radiation and convection heat transfer coefficients are simultaneously taken into consideration. The heat transfer coefficient on this square fin is very non-uniform. Thus the whole plate fin is divided into several sub-fin regions in order to predict the average heat transfer coefficient h and the fin efficiency on the fin from the knowledge of the fin temperature recordings at several selected measurement locations. The results show that the heat transfer coefficient on the bottom fin region of the tube can be markedly higher than that on the top fin region of the tube. The h value increases with the fin spacing S and approaches an asymptotical value obtained from a single square fin as S → ∞. The fin temperature distributions depart from the ideal isothermal situation and the fin temperature decreases more rapidly away from the circular center with increasing the fin spacing. In order to show the accuracy of the present inverse scheme, a comparison of the average heat transfer coefficient on the fin between the present predicated results and those obtained from the correlation recommended by current textbooks is made.
机译：提出了结合最小二乘方案和实验温度数据的有限差分法，以预测单圆管板翅片式换热器的垂直方翅片的平均自然对流换热系数和翅片效率。在本研究中，同时考虑了辐射和对流传热系数。该方形散热片上的传热系数非常不均匀。因此，整个板翅片被分成几个子翅片区域，以便根据在几个选定的测量位置的翅片温度记录的知识来预测翅片上的平均传热系数h和翅片效率。结果表明，在管的底部翅片区域上的传热系数可以明显高于在管的顶部翅片区域上的传热系数。 h值随着鳍间距S的增加而增加，并且接近于从单个正方形鳍获得的渐近值，即S→∞。翅片温度分布偏离理想的等温状态，并且随着翅片间距的增加，翅片温度远离圆形中心而下降得更快。为了显示本发明逆方案的准确性，比较了本发明的预测结果与从当前教科书推荐的相关性获得的结果之间的翅片上的平均传热系数。

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