太阳辐射对纯液体蒸发行为影响的实验研究

通过蒸发实验,考察了太阳辐射对液体苯、甲苯和乙醇蒸发行为的影响.实验结果表明,苯和甲苯表面温度随时间呈现出先降低后升高的趋势,而乙醇则呈现出先降低后恒定的趋势,且环境风速越大,这种变化趋势就越明显.液体表面温度的变化不但与太阳辐射强度以及环境风速的大小有关,还与液体本身的物理性质(如热容、蒸发潜热和饱和蒸气压)有关.因此,在预测液体的蒸发速率时,必须考虑太阳辐射或周围热辐射源对液体表面温度的影响.

Experimental Research on Influence of Solar Radiation on Evaporation Behavior of Pure Liquid

The influence of solar radiation on evaporation behavior of benzene,toluene and ethanol is researched through a series of evaporation experiments.The results indicate that the surface temperature of benzene and toluene decreases firstly and then increases and that of ethanol decreases firstly and stays invariably.Moreover the variety trend of surface temperature becomes distinct with the increase of the wind speed.The surface temperature of liquid is not only related with the solar radiation and wind speed,but also with the physical characteristics of the liquid(heat capacity,latent heat of vaporization and saturated vapor pressure).So the affection of solar radiation or other heat source on surface temperature of liquid must be considered when evaporation rate of liquid is estimated.