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首页> 外文期刊>International Journal of Heat and Mass Transfer >Evaporation of ethanol films wicking on structured, porous coatings deposited on copper plates
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Evaporation of ethanol films wicking on structured, porous coatings deposited on copper plates

机译：在铜板上沉积的结构化多孔涂层上芯吸的乙醇膜的蒸发

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Porous copper coatings were deposited on copper plates by flame spraying. Wire mesh masks were placed on the substrate while spraying to create channels in the coatings. Pores increased the capillary pressure of liquid flowing through the coating while channels increased permeability. Coated copper strips were suspended vertically with their bottom edges touching an ethanol reservoir so that liquid wicked upwards due to capillary force and evaporated. The copper strips were heated electrically and their temperature recorded as the heater power was varied. The rate of ethanol evaporation was measured by recording the change in weight of the liquid reservoir and the height of the liquid film measured from photographs. Raising surface temperature increased liquid evaporation rate and reduced the film height. Surface dry-out occurred when the mass evaporation rate became greater than the maximum wicking rate for a given surface. Increasing the effective porosity of the coating enhanced the maximum mass flow rate through it. For high porosity surfaces the liquid began to boil before dry-out occurred. An analytical model of liquid film rise was developed to predict film height, film thickness, and the rate of evaporative cooling as a function of surface temperature. (C) 2019 Elsevier Ltd. All rights reserved.
机译：通过火焰喷涂将多孔铜涂层沉积在铜板上。在喷涂的同时将金属丝网掩膜放置在基材上，以在涂料中形成通道。孔增加了流过涂层的液体的毛细压力，而通道则增加了渗透性。将涂覆的铜条垂直悬垂，使其底边接触乙醇储存器，以便液体由于毛细作用力向上芯吸并蒸发。铜带被电加热，并且随着加热器功率的变化记录其温度。通过记录储液容器的重量变化和由照片测量的液膜高度来测量乙醇的蒸发速率。升高表面温度可增加液体蒸发速率并降低膜高度。当质量蒸发速率大于给定表面的最大芯吸速率时，就会发生表面干燥。增加涂层的有效孔隙率可提高通过涂层的最大质量流量。对于高孔隙率的表面，在开始变干之前，液体开始沸腾。开发了液膜上升的分析模型，以预测膜高度，膜厚度和蒸发冷却速率与表面温度的关系。 （C）2019 Elsevier Ltd.保留所有权利。

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