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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental observation of the maximum bubble diameter in non-stationary temperature field of subcooled boiling water flow
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Experimental observation of the maximum bubble diameter in non-stationary temperature field of subcooled boiling water flow

机译：过冷沸腾水非稳态温度场中最大气泡直径的实验观察

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This paper presents results of the experimental study of the subcooled boiling flow on the surface of the vertical cylindrical steel heater. The initial stages of formation of the fully developed nucleate boiling were investigated over the unsteady stepwise heat flux range from 0.56 to 1.76 MW/m(2). The field temperature of heated liquid layers at the moment of the bubble departure was described by numerical modeling under nonstationary conditions. A high-speed digital video camera was used to capture the bubble dynamics. The effects of heat release conditions and inlet water temperature on the bubble maximum diameter and nucleation frequency were studied. We found that the increased heat flux results in reduction of the maximum diameter at non-stationary heat release. Calculations on the basis of prediction models showed that the non-stationary nucleate boiling data cannot be generalized using the models developed by Prodanovic et al. (2002) and Song (2016) with the coefficients obtained for the stationary boiling. However, the heat balance approach to calculation of the bubble maximum diameter proved to be promising, and the correlation between the bubble diameter and the overheated layer thickness was verified. (C) 2018 Elsevier Ltd. All rights reserved.
机译：本文介绍了立式圆柱形钢加热器表面过冷沸腾流的实验研究结果。在不稳定的逐步热通量范围从0.56到1.76 MW / m（2）的范围内，研究了完全发展的核沸腾形成的初始阶段。在非平稳条件下，通过数值模型描述了气泡离开时加热液体层的场温。高速数字摄像机用于捕获气泡动力学。研究了放热条件和进水温度对气泡最大直径和成核频率的影响。我们发现，增加的热通量会导致非平稳放热时最大直径的减小。根据预测模型进行的计算表明，使用Prodanovic等人开发的模型不能推广非平稳核沸腾数据。 （2002）和Song（2016）给出了固定沸腾系数。然而，计算气泡最大直径的热平衡方法被证明是有前途的，并且验证了气泡直径和过热层厚度之间的相关性。 （C）2018 Elsevier Ltd.保留所有权利。

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