Abstract

Numerical investigations of heat transfer and fluid flow have been carried out to study the effect of variation of longitudinal and transverse pitch-to-diameter ratios for a cross-flow heat exchanger with elliptical tubes. A total of 17 configurations of varying compactness are investigated. This investigation also covers the effect of aspect ratio (0.40, 0.53, 0.78, 0.92, and 1.00) and tube arrangement (inline and staggered) on the performance of a cross-flow heat exchanger. Details of heat transfer, friction factor, goodness factor and heat transfer per unit pumping power of (3 × 5) elliptic tube bundle are evaluated in the Reynolds number range of 5,500–14,500. Based on these criteria, weighed by the compactness, the configurations with the longitudinal and transverse pitch-to-diameter values of (2:1.75) and (1.75:2) are recommended.

摘要

已经进行了传热和流体流动的数值研究，以研究具有椭圆管的横流换热器的纵向和横向节径比变化的影响。总共研究了 17 种不同紧凑度的配置。该研究还涵盖了纵横比（0.40、0.53、0.78、0.92 和 1.00）和管子排列（串联和交错）对错流换热器性能的影响。在雷诺数范围 5,500–14,500 内评估 (3 × 5) 椭圆管束的每单位泵送功率的传热、摩擦系数、优良系数和传热的详细信息。基于这些标准，以紧密度为权重，推荐纵向和横向节距直径值为（2:1.75）和（1.75:2）的配置。