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首页> 外文期刊>Journal of Heat Transfer >Flow-Pattern Based Heat Transfer Correlations for Stable Flow Boiling in Micro/ Minichannels
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Flow-Pattern Based Heat Transfer Correlations for Stable Flow Boiling in Micro/ Minichannels

机译：基于流型的传热相关性，用于微通道/小通道中的稳定沸腾

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摘要

Flow-pattern based heat transfer correlations for elongated bubbly flow and annular flow in stable flow boiling microl minichannels were developed separately based on a collected microlminichannel heat-transfer database by using an improved conventional-to-microl minichannel threshold Bo = 4 and BoRe_1~(0.5) = 200, where Bo is the Bond number and Re_1 is the liquid Reynolds number. As significant disagreement in experimental trends and heat transfer mechanisms was reported for flow boiling in microl minichannels in the literature, it is not possible to explain the discrepancy and predict all data points by a single correlation without considering the different flow patterns. The newly developed flow-pattern based predictive tool cannot only present a decent overall accuracy, but also estimate the parametric trends relatively well. Over 95% of the data points can be predicted by the proposed correlations within a ±50% error band for both elongated bubbly flow and annular flow. Therefore, the flow-pattern based correlations can be applied for heat exchanger design to improve the understanding of the underlying heat transfer mechanisms and to guide the development of further enhancement techniques for flow boiling in microl minichannels.
机译：通过使用改进的常规至微型微通道阈值Bo = 4和BoRe_1〜（），基于收集的微型微通道传热数据库，分别开发了稳定流沸腾微微型通道中细长气泡流和环形流基于流型的传热相关性。 0.5）= 200，其中Bo是键数，而Re_1是液体雷诺数。由于文献中报道了微升微通道中沸腾的实验趋势和传热机理存在显着分歧，因此，如果不考虑不同的流动模式，就不可能通过单个相关性来解释差异和预测所有数据点。新开发的基于流模式的预测工具不仅可以提供不错的整体准确性，而且可以相对较好地估计参数趋势。对于细长的气泡流和环形流，通过在±50％误差带内的拟议相关性，可以预测超过95％的数据点。因此，基于流型的相关性可用于换热器设计，以增进对基本传热机制的理解，并指导微流道中沸腾的进一步增强技术的发展。

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