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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat flux distribution beneath evaporating hydrophilic and superhydrophobic droplets
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Heat flux distribution beneath evaporating hydrophilic and superhydrophobic droplets

机译：蒸发亲水性和超疏水液滴的热通量分布

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摘要

An experimental investigation of the heat and mass transfer to an evaporating hydrophilic water droplet using thin-foil thermography and droplet shape analysis is reported. These results have been compared with that of a superhydrophobic evaporating droplet. The hydrophilic droplet initially evaporated with a pinned contact line before unpinning and evaporating with a receding contact line. The largest heat flux is observed at the contact line region for both droplets. The hydrophilic droplet evaporated 34% faster than its superhydrophobic counterpart due to its greater contact line length, liquid-gas interface temperature and solid-liquid surface area for the majority of its evaporation. In general, the hydrophilic droplet dissipated a greater total power due to its larger contact line length and solid-liquid surface area, while the superhydrophobic droplet had a greater average heat flux due to its larger contact line length density for the majority of its evaporation time. The average heat flux to the evaporating droplets was demonstrated to vary as a linear function of the contact line length density.
机译：据报道了使用薄箔热成像和液滴形状分析对蒸发亲水水滴的热量和传质的实验研究。将这些结果与超疏水蒸发液滴的比较。亲水液滴最初用钉钉接触线蒸发，并且在卸载并用后退接触线蒸发。在两个液滴的接触线区域观察到最大的热通量。由于其大部分蒸发的大部分，液体 - 气体接口温度和固体 - 液体表面积越大，亲水液滴比其超疏水对应物快34％。通常，由于其较大的接触线长度和固体液体表面积，亲水性液滴耗散了更大的总功率，而超疏水液滴由于其较大的接触线长度密度而言，具有较大的平均热通量。对于大部分蒸发时间。对蒸发液滴的平均热通量进行说明以变化为接触线长度密度的线性函数。

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