正丁醇水溶液液滴的蒸发特性实验研究

自湿润流体是一种具有特殊的表面张力特性的二元流体,了解其蒸发传热特性对于揭示其强化传热机理十分重要.为了探究添加自湿润流体液滴的蒸发特性,采用液滴形状分析仪(DSA100)研究了不同温度(30、40、50、60℃)下铜底板上去离子水、正丁醇水溶液(质量分数为0.5％)液滴的蒸发特性.结果 表明:加入少量正丁醇溶液并不影...

Evaporation characteristics of n-butanol aqueous solution droplets

The droplet evaporation process is accompanied by complex flow change, which is not fully understood in the existing studies. Self-wetting fluid is a binary fluid with special surface tension properties, and understanding its evaporative heat transfer characteristics is important to reveal its enhanced heat transfer mechanism. In order to explore the evaporation characteristics of self-wetting fluid droplets, the droplet shape analyzer(DSA100) was used to study the evaporation characteristics of droplets of deionized water and n-butanol aqueous solution(0.5% mass fraction) on the copper bottom plate at different temperatures(30, 40, 50, 60 ℃). The results show that adding a small amount of n-butanol solution does not affect the evaporation mode of deionized water droplets. However, the addition of n-butanol solution to deionized water increases the contact radius of the initial droplets and decreases the initial contact angle, increases the average evaporation rate of the droplets when the bottom temperature is low, and increases the intensity of Marangoni flow during droplet evaporation thus enhancing the heat transfer effect. With the increase of the substrate temperature, the average contact angle and evaporation rate of n-butanol aqueous solution droplets are positively correlated with the temperature, which conforms to the basic evaporation model of droplets.