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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Investigating effects of heating orientations on nucleate boiling heat transfer, bubble dynamics, and wall heat flux partition boiling model for pool boiling
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Investigating effects of heating orientations on nucleate boiling heat transfer, bubble dynamics, and wall heat flux partition boiling model for pool boiling

机译：加热取向对池沸腾核沸腾热传递，泡沫动力学和壁热通量分区沸腾模型的研究

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摘要

Studying the nucleate pool boiling is an important research in the thermal science. Therefore, the pool boiling experiments are performed in this paper to investigate the effects of heating orientations on the characteristics of boiling heat transfer and bubble dynamics. Based on the measured data, the boiling heat transfer capability increases as the inclined angle of heating surface is elevated. This enhanced effect is pronounced in the lower heat flux region and is insignificant in the higher heat flux region, which is also reported in the previous works. The characteristics of bubble growth, departure, sliding, and coalescence as well as the corresponding timings can be clearly revealed in the frames taken from the high-speed videos. Based on the measurement and observation, the merged bubble diameter and departure frequency increase with the increasing heating orientation. However, the active nucleate site density is measured to be independent of the inclined angles. The relationship of bubble dynamics with the wall superheat and the heating orientation can be obtained using the least-squareerror regression method. With the input of these regressed correlations, the wall heat flux partitioning model can be assessed with the present measured boiling curves under various heating orientations. Good agreement reveals that the measured results and the corresponding regression equations provided herein can assist in validation of other boiling heat transfer models. This is one of main contributions from the present work in addition to providing additional data to understand the boiling characteristics of pool boiling under variable heating orientations.
机译：研究核心池沸腾是热科学的重要研究。因此，在本文中进行了池沸腾实验，以研究加热取向对沸腾热传递和泡沫动力学特性的影响。基于测量数据，随着加热表面的倾斜角度升高，沸腾传热能力增加。这种增强的效果在较低的热通量区域中发出明显，并且在较高的热量通量区域中具有微不足道的效果，其在先前的作品中也报告。在高速视频中拍摄的帧中可以清楚地揭示泡沫生长，脱落，滑动和聚结的特点，以及相应的定时。基于测量和观察，合并的气泡直径和脱离频率随着加热方向的增加而增加。然而，测量有源核心位点密度以与倾斜角度无关。可以使用最小二乘烧蚀回归方法获得与壁过热的气泡动力学与加热取向的关系。随着这些回归相关的输入，可以通过在各种加热方向下评估壁热通量分配模型。良好的一致性揭示了本文提供的测量结果和相应的回归方程可以有助于验证其他沸腾的传热模型。除了提供额外数据以了解可变加热方向下，本工作的主要贡献之一是本工作的主要贡献之一。

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