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首页> 外文期刊>Applied Surface Science >Contact angle and droplet heat transfer during evaporation on structured and smooth surfaces of heated wall
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Contact angle and droplet heat transfer during evaporation on structured and smooth surfaces of heated wall

机译：在加热壁的结构化和光滑表面上蒸发过程中的接触角和液滴传热

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摘要

Water evaporation in a wide range of droplet diameters and wall temperatures on the structured and smooth surfaces were studied experimentally. Linear dependence of evaporation rate (dV/dt) on a droplet radius varies when the volume is greater than 40-60 mu l. The static contact angles on the structured surface vary with a droplet diameter for high wall superheating. Dependence of the contact angle on diameter for the corrugated surface is defined by a change in both potential energy barrier U and three-phase contact line tension tau(cl). This energy barrier for the structured wall changes with an increase in the initial droplet diameter and becomes constant for the large droplets. For high wall superheating, the power in the law of evaporation increases from I to 1.45 with an increase in the initial droplet diameter. Depending on the droplet radius, number of droplets and heater length, four different characters of evaporation are realized. Complete droplet evaporation time on structured surface is less than smooth wall. Heat transfer coefficient is:greater for structured wall than smooth one. When simulating droplet evaporation and heat transfer, it is necessary to take into account free convection of air and vapor. (C) 2017 Elsevier B.V. All rights reserved.
机译：实验研究了结构化和光滑表面上各种液滴直径和壁温范围内的水蒸发。当体积大于40-60μl时，蒸发速率（dV / dt）对液滴半径的线性依赖性会发生变化。对于高壁过热，结构化表面上的静态接触角随液滴直径而变化。波纹表面的接触角与直径的关系由势能势垒U和三相接触线张力tau（cl）的变化来定义。结构化壁的这种能量屏障随着初始液滴直径的增加而变化，并且对于大液滴而言变得恒定。对于高壁过热，随着初始液滴直径的增加，蒸发定律的功率从I增加到1.45。根据液滴的半径，液滴的数量和加热器的长度，可以实现四个不同的蒸发特性。结构化表面上的液滴完全蒸发时间少于光滑壁。传热系数为：结构墙比光滑墙大。模拟液滴蒸发和传热时，必须考虑空气和蒸气的自由对流。 （C）2017 Elsevier B.V.保留所有权利。

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