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Effectiveness-NTU analyses in a double tube heat exchanger equipped with wavy strip considering various angles

机译：考虑不同角度的波浪形带管双管换热器的效率-NTU分析

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In the present study, effectiveness-NTU analyses in a double tube heat exchanger equipped with wavy strip considering various angles were experimentally studied. Moreover, variation of the effectiveness with hot water Reynolds numbers for different cold water flow rates were presented. These turbulators with different angles of 45 degrees, 60 degrees, 90 degrees, 120 degrees and 150 degrees were made of galvanized plates with thickness of 1 mm and were installed in the inner tube of heat exchanger. The experiments were carried out at Reynolds numbers of 3000-13,500 at turbulent flow regime. Throughout the experiments, hot and cold water flowed through the inner pipe and the space between the pipes (annulus), respectively. It was tried to keep the inlet hot and cold water temperatures at constant values. Effectiveness-NTU analyses were made for the conditions with and without wavy strips including their different angles and compared to each other. Results showed the considerable effect of turbulators on effectiveness (a) and number of heat transfer units (NTU) of double tube heat exchanger. In addition, some empirical correlations expressing the results were also developed based on curve fitting. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在本研究中，实验研究了在考虑各种角度的带波浪形条的双管式换热器中的有效性-NTU分析。此外，还提出了不同冷水流量下热水雷诺数的有效性变化。这些具有45度，60度，90度，120度和150度不同角度的湍流器由厚度为1mm的镀锌板制成，并安装在热交换器的内管中。实验在湍流状态下以雷诺数3000-13500进行。在整个实验过程中，热水和冷水分别流过内管和管之间的空间（环形空间）。试图将进水口的冷热水温度保持恒定。对带有和不带有波浪带的条件（包括它们的不同角度）进行了有效性-NTU分析，并将它们进行了比较。结果表明，湍流器对双管式换热器的效率（a）和传热单元数（NTU）有相当大的影响。此外，还基于曲线拟合建立了一些表示结果的经验相关性。 （C）2016 Elsevier Ltd.保留所有权利。

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