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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer enhancement associated with electrostatic suppression of Leidenfrost droplets
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Heat transfer enhancement associated with electrostatic suppression of Leidenfrost droplets

机译：静电抑制莱顿弗罗斯特液滴的传热增强

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摘要

A liquid drop levitates on its own vapor on a sufficiently hot surface (the Leidenfrost effect). Application of an electrical potential difference across the vapor gap suppresses the Leidenfrost state via electrostatic attraction of liquid towards the surface. The resultant transient solid-liquid contacts significantly reduce the thermal resistance to heat transfer across the insulating vapor gap. This work is an indepth study on the heat transfer enhancement accompanying electrostatic suppression of the Leidenfrost state. A purely analytical model is developed to predict the heat transfer enhancement based on the transient wetting dynamics observed during suppression. This model is based on semi-infinite conduction heat transfer coupled with a physics-based prediction of the voltage-dependent wetted fraction. The model is strongly validated by comparison with inhouse experiments and related experimental data from literature. These experiments measure the heat transfer enhancement associated with electrostatic suppression of the Leidenfrost state for three fluids, at various applied voltages and superheats. The experimentally-validated model predicts that heat transfer enhancement scales as the square of the wetted fraction. Results show a 4X enhancement in heat transfer by electrostatic suppression of the Leidenfrost state of water droplets; higher enhancements are measured for organic solvents.
机译：液滴在足够热的表面上悬浮在其自身的蒸气上（莱顿弗罗斯特效应）。在蒸气间隙上施加电势差会通过液体向表面的静电吸引来抑制莱顿弗罗斯特状态。产生的瞬态固液接触大大降低了通过绝热蒸气间隙传热的热阻。这项工作是对伴随莱顿弗罗斯特状态的静电抑制的传热增强的深入研究。开发了一个纯粹的分析模型，用于基于抑制过程中观察到的瞬态润湿动力学来预测传热增强。该模型基于半无限传导热传递以及基于电压的润湿分数的基于物理的预测。通过与内部实验以及来自文献的相关实验数据进行比较，该模型得到了有效验证。这些实验测量了三种流体在各种施加电压和过热下与莱顿弗罗斯特状态的静电抑制相关的传热增强。经实验验证的模型预测，传热增强与润湿分数的平方成比例。结果表明，通过静电抑制水滴的莱顿弗罗斯特状态，传热提高了4倍。对于有机溶剂，可以测量出更高的增强效果。

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