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首页> 外文期刊>International Journal of Heat and Mass Transfer >Flow regime-based modeling of heat transfer and pressure drop in microchannel flow boiling
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Flow regime-based modeling of heat transfer and pressure drop in microchannel flow boiling

机译：基于流态的微通道沸腾传热和压降建模

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摘要

Local heat transfer coefficients and pressure drops during boiling of the dielectric liquid fluorinert FC-77 in parallel microchannels were experimentally investigated in recent work by the authors. Detailed visualizations of the corresponding two-phase flow regimes were performed as a function of a wide range of operational and geometric parameters. A new transition criterion was developed for the delineation of a regime where microscale effects become important to the boiling process and a conventional, macroscale treatment becomes inadequate. A comprehensive flow regime map was developed for a wide range of channel dimensions and experimental conditions, and consisted of four distinct regions - bubbly, slug, confined annular, and alternating churn/annular/wispy-annular flow regimes. In the present work, physics-based analyses of local heat transfer in each of the four regimes of the comprehensive map are formulated. Flow regime-based models for prediction of heat transfer coefficient in slug flow and annular/ wispy-annular flow are developed and compared to the experimental data. Also, a regime-based prediction of pressure drop in microchannels is presented by computing the pressure drop during each flow regime that occurs along the microchannel length. The results of this study reveal the promise of flow regime-based modeling efforts for predicting heat transfer and pressure drop in microchannel boiling.
机译：作者在最近的工作中通过实验研究了平行微通道中介电液体氟化物FC-77在沸腾过程中的局部传热系数和压降。根据广泛的运行和几何参数，对相应的两相流态进行了详细的可视化显示。开发了一种新的过渡标准，用于划定一种方案，在该方案中，微尺度效应对沸腾过程变得很重要，而常规的宏观尺度处理变得不充分。针对各种通道尺寸和实验条件开发了一个综合的流态图，它由四个不同的区域组成：气泡状，团状，密闭环形和交替搅动/环形/小环流。在当前的工作中，在综合图的四个区域中的每一个区域中，都建立了基于物理的局部传热分析。建立了基于流态的模型，用于预测团状流和环形/细小环形流中的传热系数，并将其与实验数据进行了比较。而且，通过计算沿微通道长度发生的每个流动状态期间的压降，提出了基于策略的微通道压降预测。这项研究的结果揭示了基于流态的建模工作有望预测微通道沸腾中的传热和压降的希望。

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