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Fundamental issues, mechanisms and models of flow boiling heat transfer in microscale channels

机译：微型通道中流动沸腾传热的基本问题，机理和模型

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摘要

This paper presents state-of-the-art review on the fundamental and frontier research of flow boiling heat transfer, mechanisms and prediction methods including models and correlations for heat transfer in microscale channels. First, fundamental issues of current research on flow boiling in microscale channels are addressed. These mainly include the criteria for macroscale and microscale channels. Then, studies on flow boiling heat transfer behaviours and mechanisms in microscale channels are presented. Next, the available correlations and models of flow boiling heat transfer in microscale channels are reviewed and analysed. Comparisons of 12 correlations with a database covering a wide range of test parameters and 8 fluids are presented. It shows that all correlations poorly agree to the database. No generalized model or correlation is able to predict all flow boiling heat transfer data. Furthermore, comparisons of the mechanistic flow boiling heat transfer models based on flow patterns including the Thome et al. three-zone heat transfer model for evaporation in microchannel and the flow pattern based model combining the Thome et al. three zone heat transfer models with the Cioncolini-Thome annular flow model for both macro- and microchannel to the database are presented. It shows that the flow pattern based model combining the three zone model with the annular flow model gives better prediction than the three zone heat transfer model alone. The flow pattern based heat transfer model favourably agrees with the experimental database collected from the literature. According to the comparison and analysis, suggestions have been given for improving the prediction methods in the future. Next, flow patterned based phenomenological models and their applications to microscale channels are presented. Finally, as an important topic, unstable and transient flow boiling phenomena in microscale channels are briefed and recommendations for future research are given. According to this comprehensive review and analysis of the current research on the fundamental issues of flow boiling, mechanisms and prediction methods in microscale channels, the future research needs have been identified and recommended. In general, systematic and accurate experimental data of flow boiling heat transfer in microscale channels are still needed although a large amount of work has been done over the past decades. The channel size effect on the flow boiling behaviours should be systematically investigated. Heat transfer mechanisms in microscale channels should be further understood and related to the corresponding flow patterns. Furthermore, effort should be made to develop and improve generalized mechanistic prediction methods and theoretical models for flow boiling heat transfer in microscale channels according to the physical phenomena/mechanisms and the corresponding flow structures. The effects of the channel size and a wide range of test conditions and fluid types should be considered in develop new methods. Furthermore, systematic experimental, analytical and modeling studies on unstable and transient flow boiling heat transfer in microscale channels should be conducted to understand the physical mechanisms and theoretical models.
机译：本文介绍了有关流动沸腾传热的基础和前沿研究的最新进展，机理和预测方法，包括微观尺度传热的模型和相关性。首先，解决了当前在微型通道中进行沸腾研究的基本问题。这些主要包括宏观和微观渠道的标准。然后，提出了微尺度通道内流沸腾传热行为及其机理的研究。接下来，回顾和分析了微尺度通道中流动沸腾传热的相关性和模型。提出了12种相关性与涵盖广泛测试参数和8种流体的数据库的比较。它表明所有相关性都很难与数据库一致。没有广义模型或相关性能够预测所有流动沸腾传热数据。此外，基于流模式的机械流沸腾传热模型的比较包括Thome等人。微区蒸发的三区传热模型和结合Thome等人的基于流型的模型。提出了具有Cioncolini-Thome环形流动模型的三个区域的传热模型，分别用于数据库的宏通道和微通道。结果表明，与单独的三区传热模型相比，将三区模型与环形流模型相结合的基于流型的模型提供了更好的预测。基于流动模式的传热模型与文献中收集的实验数据库完全吻合。通过比较分析，提出了今后改进预测方法的建议。接下来，介绍了基于流模式的现象学模型及其在微尺度通道中的应用。最后，作为一个重要的话题，简要介绍了微尺度通道中的不稳定和瞬时流动沸腾现象，并提出了进一步研究的建议。根据对当前关于微尺度通道沸腾的基本问题，机理和预测方法的研究的全面回顾和分析，确定并推荐了未来的研究需求。总的来说，尽管在过去的几十年中已经进行了大量的工作，但仍需要在微尺度通道中进行沸腾传热的系统准确的实验数据。通道尺寸对流动沸腾行为的影响应进行系统研究。微型通道中的传热机制应进一步理解并与相应的流型有关。此外，应努力根据物理现象/机理和相应的流动结构，开发和改进用于微尺度通道中流动沸腾传热的通用机理预测方法和理论模型。在开发新方法时，应考虑通道尺寸以及各种测试条件和流体类型的影响。此外，应进行系统的实验，分析和建模研究，以研究微尺度通道中的不稳定和瞬态流动沸腾传热，以了解物理机理和理论模型。

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    Cheng Lixin; Xia Guodong;

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  • 年度 2017
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  • 正文语种 en
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