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首页> 外文期刊>International Journal of Heat Exchangers >Measurements and Predictions of the Heat Transfer at the Tube-Fin Junction for Louvered Fin Heat Exchangers
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Measurements and Predictions of the Heat Transfer at the Tube-Fin Junction for Louvered Fin Heat Exchangers

机译：百叶窗式翅片换热器管-管结处传热的测量和预测

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摘要

The dominant thermal resistance for most compact heat exchangers occurs on the air side and thus a detailed understanding of air side heat transfer is needed to improve current designs. Louvered fins, rather than continuous fins, are commonly used to increase heat transfer by initiating new boundary layer growth and increasing surface area. The tube wall from which the fins protrude has an impact on the overall heat exchanger performance. The boundary layer on the external (typically, air) side of the tube is subjected to repeated interruptions at the louver-tube junction. This paper discusses baseline results of a combined experimental and computational study of heat transfer along the tube wall of a typical compact heat exchanger design. A scaled-up model of a multi-louver array protruding from a heated flat surface was used for the experiments. With the exception of the inlet and turnover louver regions, the results of this study indicate agreement with steady, three-dimensional computational predictions to within 5% for Re = 230 and 8% for Re = 1016.
机译：对于大多数紧凑型热交换器，主要的热阻发生在空气侧，因此需要对空气侧的传热进行详细了解，以改善当前的设计。百叶窗式散热片而非连续散热片通常用于通过启动新的边界层生长和增加表面积来增加热传递。翅片从其突出的管壁对整体热交换器性能有影响。管的外侧（通常是空气）的边界层在百叶窗管的连接处反复受到干扰。本文讨论了典型紧凑型换热器设计沿管壁传热的实验和计算研究相结合的基线结果。从加热的平坦表面突出的多百叶窗阵列的放大模型用于实验。除进风口和周转百叶窗区域外，本研究结果表明，与稳定的三维计算预测相符，Re = 230时在5％以内，Re = 1016时在8％以内。

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