Abstract

This paper considers the previously discovered by the authors non-monotonic effect of the water velocity on the nucleate boiling of a subcooled flow. We present experimental results for the following conditions: initial pressure 0.18 and 0.48 MPa, subcooling level 54 and 120 K, initial flow velocity in the range from 0 to 1.73 m/s, and carry out numerical analysis of the model for nonstationary nucleate boiling. We have studied the results of the numerical analysis of heat fluxes for individual nucleation centers and their influence on the overall thermal picture in the near-wall layer. It is shown that the heat transfer enhancement in the neighborhood of the nucleation centers for liquid velocities of ∼0.4 m/s may result in the increase of the generated vapor volume.

摘要

本文考虑了作者先前发现的水速对过冷流的核沸腾的非单调效应。我们给出了以下条件的实验结果：初始压力0.18和0.48 MPa，过冷度54和120 K，初始流速在0到1.73 m / s范围内，并对非平稳核沸腾模型进行了数值分析。我们研究了单个形核中心的热通量数值分析结果及其对近壁层整体热图像的影响。结果表明，液体速度约为 0.4 m/s 时，成核中心附近的传热增强可能导致产生的蒸汽体积增加。