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首页> 外文期刊>International Journal of Thermal Sciences >Numerical investigation on heat transfer of water spray cooling from single-phase to nucleate boiling region
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Numerical investigation on heat transfer of water spray cooling from single-phase to nucleate boiling region

机译：单期水喷雾冷却传热的数值研究核心沸点

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摘要

In the present study, spray cooling heat transfer characteristics were numerically investigated under the heat flux ranging from 50 to 170 W/cm(2). Effect of nozzle height and spray pressure was also studied in order to reveal the microscopic mechanisms of the heat transfer enhancement from single-phase to nucleate boiling regions. A two-phase flow heat transfer model was adopted based on the Euler-Lagrangian approach. The dependence of thermo-physical properties of fluid on the temperature was also taken into account. The comparison between simulated wall temperature and experimental data demonstrates a satisfactory agreement. The results show that the heat transfer coefficient increases monotonously with the heat flux. In the nucleate boiling region, the wall film is thinner with a smaller velocity compared with those in the single-phase region. Spray cooling heat transfer is enhanced evidently as the nozzle height decreases and the spray pressure increases. The most important feature which separates the present study from the literature is that the numerical simulation in this paper presents some detailed microscopic characteristics, e.g. the wall film thickness and velocity, which play an important role in spray cooling heat transfer.
机译：在本研究中，在50至170w / cm（2）的热通量下数量地研究了喷雾冷却热传递特性。还研究了喷嘴高度和喷雾压力的影响，以揭示从单相到核心沸点的热传递增强的显微镜机制。采用了一种基于欧拉拉格朗日方法采用了两相流动传热模型。还考虑了流体对温度的热物理性质的依赖性。模拟壁温和实验数据之间的比较展示了令人满意的协议。结果表明，传热系数随热通量单调增加。在核心沸点区域中，与单相区域中的那些相比，壁膜具有较小的速度。随着喷嘴高度减小并且喷射压力增加，喷雾冷却热传递显着提高。从文献中分离目前研究的最重要的特征是本文的数值模拟呈现了一些详细的微观特性，例如一些详细的显微镜特性。壁膜厚度和速度，在喷雾冷却热转印中起着重要作用。

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