Numerical simulation of subcooled flow boiling on micro-/nanostructured
surfaces in water cooling systems of divertors

doi:10.16568/j.0254-6086.202304004

Abstract

Abstract: In order to improve the capacity of heat transfer and the thermal load in the water cooling systems of divertors, it is necessary to develop micro-nano structured surface enhanced heat transfer methods. Based on the experimental microscopic observations on micro-/nanostructured surfaces, the models of the contact angle, the bubble departure diameter, the bubble departure frequency and the nucleation site density are modified to simulate the subcooled flow boiling heat transfer on micro-/nanostructured surfaces. The modified models are used in water cooling systems of divertors with the working condition of a pressure of 4MPa, a velocity of 10m·s^-1 and the inlet temperature of 423K. The contours of the temperature and the vapor volume fraction of the smooth surface channel and the micro-/nanostructured surface channel are compared, and the heat transfer coefficients of the micro-/nanostructured surfaced are approximately doubled, the steady heat flux of the micro-/nanostructured surface channel can reach up to 14MW·m^-2 with the allowable temperature of OFHC and CuCrZr.

Key words: Micro-/nanostructured surfaces, Bubble characteristic, Subcooled flow boiling, Divertor; Numerical simulation

摘要： 为模拟偏滤器水冷模块微纳米结构化表面的传热特性，结合微纳表面可视化微观观察实验数据，在现有气泡参数模型的基础上，对接触角、气泡脱离直径、气泡脱离频率、汽化核心密度等参数模型进行修改，提出可模拟微纳表面过冷流动沸腾传热效果的计算模型。用该模型对压力为 4MPa、速度为 10m·s^-1 、进口温度为 423K 的偏滤器水冷结构中的过冷流动沸腾进行计算，得到常规水冷通道与微纳表面水冷通道各结构的温度与气相体积分布。计算结果表明，微纳表面的平均传热系数提高约一倍；在无氧铜与铬锆铜的许用温度范围内，微纳表面通道偏滤器承受的稳态热流密度可达 14MW·m^-2 。

关键词: 微纳米结构化表面；气泡特征参数；过冷流动沸腾；偏滤器；数值模拟

CLC Number:

TK124

LIU Jin , ZHOU Zhan-ru , HUANG Sheng-hong , YE Min-you. Numerical simulation of subcooled flow boiling on micro-/nanostructured surfaces in water cooling systems of divertors [J]. Nuclear Fusion and Plasma Physics, 2023, 43(4): 392-401.

刘晋, 周展如, 黄生洪, 叶民友. 偏滤器微纳表面冷却通道的过冷流动沸腾数值模拟[J]. 核工业西南物理研究院, 2023, 43(4): 392-401.

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Numerical simulation of subcooled flow boiling on micro-/nanostructured surfaces in water cooling systems of divertors

偏滤器微纳表面冷却通道的过冷流动沸腾数值模拟

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