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首页> 外文期刊>International Journal of Thermal Sciences >Electrophoretic deposition surfaces to enhance HFE-7200 pool boiling heat transfer and critical heat flux
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Electrophoretic deposition surfaces to enhance HFE-7200 pool boiling heat transfer and critical heat flux

机译：电泳沉积表面增强HFE-7200池沸腾的传热和临界热通量

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摘要

Modulated nanoparticle-coating surfaces were fabricated by an improved electrophoretic deposition technique in this study. Pool boiling experiments were studied for HFE-7200 on the modulated nanoparticle-coating surfaces, with a smooth surface and uniform coating surfaces as comparison. It was found that the present modulated coating surfaces can enhance the heat transfer coefficient and the critical heat flux by 60% and 20%-40%, respectively, in comparison to the smooth surface, while the uniform coating surface can improve heat transfer coefficients by maximum 100%, but cannot enhance critical heat fluxes. Heat transfer on the modulated nanoparticle-coating surfaces was theoretically analyzed by a mechanistic model which considered free convection, transient conduction and microlayer evaporation. The heat transfer can be predicted by the model, especially at low-to-moderate heat fluxes. Additionally, referring to the bubble visualization at critical heat fluxes, possible mechanisms to trigger critical heat fluxes were discussed. Afterwards, a critical heat flux model originating from the Zuber hydrodynamic instability model, was employed to predict the experimental results, showing a good prediction ability.
机译：通过该研究的改进的电泳沉积技术制造调制的纳米粒子涂层表面。在调制的纳米颗粒 - 涂布表面上对HFE-7200进行了池沸腾实验，具有光滑的表面和均匀的涂层表面。结果发现，与光滑的表面相比，本调制涂层表面分别将传热系数和临界热通量增强60％和20％-40％，而均匀的涂层表面可以通过以下方式改善传热系数最大100％，但不能增强临界热量。通过考虑自由对流，瞬时传导和微层蒸发的机制模型理论上分析调制的纳米颗粒涂层表面上的热传递。可以通过模型预测热传递，特别是在低至中等热通量下。另外，参考临界热通量的气泡可视化，讨论了触发临界热通量的可能机制。之后，采用来自Zuber流体动力不稳定模型的临界热通量模型来预测实验结果，显示出良好的预测能力。

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