Abstract Finned tube heat exchangers are among the most common types of heat exchangers that are used in engineering applications. Most of the tubes used in finned-tube heat exchangers are of circular type, but the oval tubes have more desirable features as they impose lower pressure drops with approximately the same amount of heat transfer. In this paper, a finned oval tube is studied experimentally and numerically to obtain temperature fields around the tube at different locations. Moreover, several 3D numerical simulations are performed to study the effects of fin length, fin spacing and diameter ratio of the tube cross section. Based on the obtained results, fin spacing of 1 mm is the optimum at all tube aspect ratios and fin lengths when Reynolds number is low while at high Reynolds numbers, fin spacing of 3 or 4 mm is the better choice. As to the fin length considerations, for a short fin, a spacing of 3 or 4 mm is the best choice at high Reynolds numbers. For larger fin lengths, sensitivity to fin spacing is less but a fin spacing of 3 or 4 is preferable at high Reynolds numbers.

中文翻译：

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不同翅片配置下椭圆管翅片热工水力特性试验研究与数值模拟

摘要 翅片管换热器是工程应用中最常见的换热器类型之一。翅片管换热器中使用的大多数管子都是圆形的，但椭圆形管子具有更理想的特性，因为它们在几乎相同的传热量下施加较低的压降。在本文中，对翅片椭圆管进行了实验和数值研究，以获得管周围不同位置的温度场。此外，还进行了几个 3D 数值模拟来研究翅片长度、翅片间距和管横截面直径比的影响。根据获得的结果，当雷诺数低时，翅片间距在所有管纵横比和翅片长度下都是最佳的，而在高雷诺数时，翅片间距 3 或 4 毫米是更好的选择。至于翅片长度的考虑，对于短翅片，3 或 4 毫米的间距是高雷诺数下的最佳选择。对于较大的翅片长度，对翅片间距的敏感性较小，但在高雷诺数下，翅片间距最好为 3 或 4。