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首页> 外文期刊>International Journal of Heat and Mass Transfer >Analysis on thermal hydraulic performance of the elliptical tube in the finned-tube heat exchanger by new method
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Analysis on thermal hydraulic performance of the elliptical tube in the finned-tube heat exchanger by new method

机译：新方法分析翅片管换热器中椭圆管的热工水力性能

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The main objectives were to develop a method for designing an effective finned heat exchanger through changing the configuration to ensure the tubes be streamlined shape. Kinds of inserts including, vortex generator, louver fin, and serrated fin in the heat transfer was used to increase the effect of thermal performance, but also was harmful to the flow characteristics. Consequently, the comprehensive performance was obviously lower than the heat exchangers with no inserts. In order to solve this problem, streamlined tube configuration was adopted in this paper to search a new method to enhance the comprehensive performance by reducing the Karman vortex street effect. Two modified configurations of tube were investigated in this paper. The modified configurations were both made of semicircular tube and semielliptical tube. The simulation was validated by Wang's experiment and Arafat's simulation. The numerical data were presented at Reynolds number in the range between 1300 and 2000. Based on the numerical results, the effect of elliptical axis ratio on the thermal hydraulic performance was discussed. The results showed that the comprehensive performance of the modified configurations was greater than that of the circular tube. In addition, the velocity vector, flow streamline and temperature contour of the configurations were displayed. The Karman vortex street effect was adopted to explain the reason of wake region formation. It can be concluded that long and thin section of heat transfer tube, which was coincident with streamlined design, was beneficial to improve the comprehension performance of the heat exchanger. (C) 2019 Elsevier Ltd. All rights reserved.
机译：主要目标是开发一种通过更改配置来设计有效翅片式热交换器的方法，以确保管子呈流线型形状。传热中使用了包括涡流发生器，百叶窗翅片和锯齿状翅片在内的各种插入物，以提高热性能的效果，但也不利于流动特性。因此，综合性能明显低于没有插入件的热交换器。为了解决这个问题，本文采用了流线型的管结构，以寻求一种新的方法来通过降低卡曼涡街效应来增强综合性能。本文研究了两种改进的管子配置。修改后的配置均由半圆形管和半椭圆形管制成。该模拟已通过Wang的实验和Arafat的模拟进行了验证。数值数据以雷诺数表示，范围为1300至2000。基于数值结果，讨论了椭圆轴比对热工水力性能的影响。结果表明，改进配置的综合性能优于圆形管。此外，还显示了配置的速度矢量，流线和温度轮廓。采用卡尔曼涡街效应来解释尾流区形成的原因。可以得出结论，传热管的长而薄的截面与流线型设计相吻合，有利于提高热交换器的综合性能。 （C）2019 Elsevier Ltd.保留所有权利。

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