Abstract This paper presents a numerical study of the heat transfer associated with multiple sliding bubbles in saturated flow boiling. We develop a stagnant micro-layer model, which is subsequently validated with an existing experimental study. We employ the said model to simulate flow boiling with shear rates γ ranging from 0.02 s−1 through 0.17 s−1, for bubble spacing s = 2.5 mm and 5 mm. We observe that for a fixed s, the heat transfer coefficients for all values of γ deviate from one another after a certain time. For cases with s = 5.0 mm, we observe a distinct bubble growth period prior to bubble sliding. For cases with s = 2.5 mm, we observe a relatively short growth period followed by prolonged sliding. The micro-layer contributes up to 65 % of the total latent heat absorbed. Cases with s = 2.5 mm yield a better heat transfer coefficient than those with s = 5 mm. The improvement in the heat transfer coefficient correlates linearly with the lift-off time.

中文翻译：

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饱和流动沸腾中滑动气泡的数值模拟

摘要 本文对饱和流动沸腾中与多个滑动气泡相关的传热进行了数值研究。我们开发了一个停滞的微层模型，随后通过现有的实验研究对其进行了验证。我们采用上述模型来模拟流动沸腾，剪切速率 γ 范围从 0.02 s-1 到 0.17 s-1，气泡间距 s = 2.5 mm 和 5 mm。我们观察到，对于固定的 s，所有 γ 值的传热系数在一定时间后彼此偏离。对于 s = 5.0 mm 的情况，我们在气泡滑动之前观察到明显的气泡生长期。对于 s = 2.5 mm 的情况，我们观察到相对较短的生长期，然后是长时间的滑动。微层占吸收的总潜热的 65%。s = 2 的情况。5 mm 产生比 s = 5 mm 更好的传热系数。传热系数的提高与提离时间呈线性相关。