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首页> 外文期刊>International Journal of Heat Exchangers >Compact Heat Exchangers for Phase Change
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Compact Heat Exchangers for Phase Change

机译：用于相变的紧凑型热交换器

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摘要

Compact heat exchangers are being increasingly considered for duties involving phase change processes of boiling and condensation. In many cases such applications are completely new and no previous experience or information on exchanger performance is available. Understanding the thermal-hydraulic characteristics of flow passages of compact heat exchangers for phase change duties is therefore vitally important. Even for those compact heat exchangers, which have long been used for boiling and condensation duties, design procedures based on local two-phase characteristics are clearly preferred. This paper reviews the currently available information about phase change in small diameter channels, which are typical of the compact heat exchanger passages. These channels often exhibit different two-phase heat transfer characteristics when compared to 'normal', large diameter tubes. These differences caused by narrowness, and in some cases, non-circular nature of the flow channels are discussed. Some general considerations regarding the effectiveness of single phase heat transfer enhancement features for two-phase applications, the use of fin efficiency term for two-phase duties and the introduction of two phase flow in compact heat exchanger passages are discussed. Finally, some areas of further work are delineated.
机译：越来越多地考虑将紧凑型热交换器用于涉及沸腾和冷凝的相变过程的工作。在许多情况下，此类应用程序是全新的，并且没有以前的经验或有关交换器性能的信息。因此，了解用于相变任务的紧凑型热交换器的流道的热工液压特性至关重要。即使对于那些长期以来一直用于沸腾和冷凝工作的紧凑型热交换器，基于局部两相特性的设计程序显然也是优选的。本文回顾了有关小直径通道中相变的当前可用信息，这是紧凑型热交换器通道的典型特征。与“常规”大直径管相比，这些通道通常表现出不同的两相传热特性。讨论了由狭窄以及某些情况下流动通道的非圆形特性引起的这些差异。讨论了有关两相应用中单相传热增强功能的有效性，翅片效率项用于两相负荷以及在紧凑型热交换器通道中引入两相流的一些一般考虑。最后，划定了一些进一步工作的领域。

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