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单组分液体蒸发过程动力学特性 预览 被引量:6

Dynamic characteristics of evaporation process for a mono-component liquid
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摘要 引言 危险性液体或液化气体泄漏后不断向环境中挥发出有毒有害蒸气,不但污染环境,也会威胁人体健康.对液体蒸发过程进行研究,将有助于预测大气环境中有毒有害蒸气的浓度,对环境风险评价具有一定的指导意义. It is very important to predict the concentration of hazardous vapor in the air when some flammable or toxic liquid is released on the ground. In order to achieve the aim, the evaporation rate of released liquid must be known, which is based on understanding the evaporation dynamic process. In this paper, wind tunnel evaporation experiments of benzene was made to study the dynamic characteristics of evaporation process for a mono-component liquid. The evaporation rate was obtained by measuring the mass loss rate of the evaporating liquid. The experiments results indicated that the evaporation rate of benzene increased as wind speed or pool depth increased. When the evaporation area was the same, the evaporation rate decreased as the characteristic size of the liquid pool increased. And when the evaporation surface was located above the ground, the evaporation rate was greater than that of evaporation surface located on the ground. The evaporation process of benzene was influenced by wind speed, characteristic size of the liquid pool and degree of atmospheric turbulence, i.e. , the evaporation of benzene was controlled by boundary layer evaporation. So, during the process of developing an evaporation model of the substance such as benzene, which has stronger volatility and lower saturation concentration in the air, the basic evaporation process itself can be ignored. Moreover, the influence of pool depth on evaporation indicated that heat transfer was very important in the evaporation process. Heat transfer and mass transfer should be considered at the same time when an evaporation mathematical model is developed.
作者 潘旭海 蒋军成 龚红卫 PAN Xuhai, JIANG Juncheng, GONG Hongwei (School of Urban Construction and Safety & Environmental Engineering, Nanjing University of Technology, Nanjing 210009, Jiangsu, China)
出处 《化工学报》 EI CAS CSCD 北大核心 2006年第9期 2058-2061,共4页 Journal of Chemical Industry and Engineering(China)
基金 国家自然科学基金重点项目(29936110) 教育部骨干教师资助计划项目.
关键词 单组分液体 蒸发 风洞实验 mono-component liquid evaporation wind tunnel experiment
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参考文献13

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