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Condensation flow patterns inside plain and microfin tubes: A review

机译：普通管和微翅片管内的冷凝流模式：综述

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摘要

Nowadays, plain and microfin tubes are largely used in refrigeration and air conditioning industries for condensation inside macroscale tubes. The mechanisms of condensation heat transfer and pressure drop are tightly linked with the prevailing two-phase flow regime, but not much evidence about the effect of microfins on the condensation flow patterns is still available in the open literature. A deep overview about the relevant literature on two phase flow pattern visualization inside tube considering experimental techniques, suggested flow regime maps and models for heat transfer coefficient is presented. Furthermore, this paper presents the extensive experimental contribution of the Authors with smooth and microfin tubes. The collected data for plain tube are compared against different flow pattern maps. The flow visualizations obtained for microfin tube are compared with those of plain tube; moreover, two flow regime maps proposed by present Authors for smooth and enhanced tubes are validated.
机译：如今，普通管和微翅片管广泛用于制冷和空调行业中，以用于大型管内的冷凝。冷凝水传热和压降的机理与普遍的两相流态紧密相关，但是在公开文献中仍然没有太多关于微翅片对冷凝水流型影响的证据。深入介绍了有关考虑实验技术的管内两相流模式可视化的相关文献，建议的流态图和传热系数模型。此外，本文介绍了作者对光滑和微翅片管的广泛实验贡献。将普通管收集的数据与不同的流型图进行比较。将微翅片管的流动可视化与普通管的流动可视化进行了比较;此外，验证了当前作者提出的用于光滑管和增强管的两个流动状态图。

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