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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer prediction and critical heat flux mechanism for pool boiling of NOVEC-649 on microporous copper surfaces
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Heat transfer prediction and critical heat flux mechanism for pool boiling of NOVEC-649 on microporous copper surfaces

机译：Novec-649在微孔铜表面上池沸腾的传热预测和临界热通量机制

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摘要

Pool boiling performance of NOVEC-649 was experimentally studied on microporous surfaces prepared by an electrochemical deposition method. Microporous structures contribute to large surface roughness values and provide large quantities of cavities ranging from several hundreds of nanometers to several microns for bubble nucleation. The results show that a maximum enhancement of 600% in heat transfer coefficient and a maximum enhancement of 55% in critical heat flux are achieved on the deposited surfaces, compared with a smooth copper surface. Experimental heat transfer coefficients were compared with literature correlations, considering the effects of roughness and surface-liquid combination. Then a fitted Rohsenow correlation was discussed and developed to predict the present results. Experimental critical heat fluxes were compared with classical models. It was found that the critical heat flux on the smooth surface could be predicted by the lift-off model and the Kandlikar model, but these models cannot predict the critical heat fluxes on the deposited surfaces well. Following, the Kandlikar model was modified by further considering a wicking force and a roughness-factor-dependent surface tension force. The present modified CHF model was validated by comparing with present experimental data and the literature, with a deviation around +/- 30%. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在通过电化学沉积方法制备的微孔表面上实验研究Novec-649的池沸点性能。微孔结构有助于大的表面粗糙度值，并提供大量的空腔，范围为几百纳米至几微米以用于泡沫成核。结果表明，与光滑的铜表面相比，在沉积的表面上实现了热传递系数的最大增强600％，在临界热通量中实现了55％的最大增强。考虑到粗糙度和表面液体组合的影响，将实验传热系数与文献相关进行了比较。然后讨论并开发了拟合的Rohsenow相关性以预测目前的结果。与经典模型进行比较实验临界热量。发现光滑表面上的临界热通量可以通过剥离模型和Kandlikar模型来预测，但这些模型不能很好地预测沉积的表面上的临界热量。在此之后，通过进一步考虑芯吸力和粗糙因子依赖性表面张力来修改Kandlikar模型。通过与本实验数据和文献进行比较验证了本修改的CHF模型，偏差约为+/- 30％。 （c）2019 Elsevier Ltd.保留所有权利。

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