Investigating The Dynamic Mass Transfer Characteristics Between Vapour And Liquid Equilibrium Interface Of LiBr Aqueous Solution Added Multi-phase Additive

According to the classical mass transfer theory and the analysis of water vaporcondensating on water surface, a model of LiBr aqueous solution absorbing water vapor undernon-equilibrium gas-liquid boundary conditions was established. The properties of surfactantsand nano-particle was introduced，and the mass transfer mechanism of LiBr aqueous solutionadded surfactants and nano-particles was describes briefly.This article built a facility of multi-phase LiBr aqueous solution gas-liquid equilibriumthermal physical properties test bench. Static method is used to test the lithium bromidesaturated vapor pressure (concentration range form56%to60%, temperature range from20℃to60℃). The effect of2EH and nano-particles on LiBr aqueous solution saturated vaporpressure was measured. We found that LiBr aqueous solution saturated vapor pressure wasrising when2EH and nano-particles was added respectively, and the effect on vapor pressurewas overlay as2EH and nano-particles was added together.Using instantaneous disturbance method，the mass transfer coefficient of model built inthis article was tested (LiBr aqueous solution concentration range form56%to60%,temperature range from20℃to60℃). The results showed that the mass transfer coefficientranged form5.5×10-5~8.0×10-5kg/(m2·s)kg/(m2·s) and its mean value is6.8×10-5kg/(m2·s).The influence of2EH and nano-particles on mass transfer coefficient was researched, andobserved that2EH and nano-particles could improve the mass transfer coefficient of LiBraqueous solution. The maximum mass transfer coefficient improvement was105%, when2EH and nano-particles was added together.The model of LiBr aqueous solution absorbing water vapor under non-equilibriumgas-liquid boundary conditions（non-equilibrium gas-liquid boundary model） was verifiedand proved more objectively on the describing water vapor absorption process. The analysisshow that non-equilibrium gas-liquid boundary model had no difference with equilibriumgas-liquid boundary model when lithium bromide solution absorbs water vapor lasts for along time. If the surface of LiBr aqueous solution absorbed water vapor in a short time,non-equilibrium gas-liquid boundary model is more close to the actual situation.