湍流状态下单组分气液相平衡体系压力的变化  

Deviation of system pressure for one-component vapor-liquid phase equilibrium in turbulence

作　　者：张珍禛[1] 姚远[2] 罗会娟[1] 宋俊男[1] 江小波[1] 郭锴[1] 

机构地区：[1]北京化工大学化学工程学院,北京100029 [2]中国石油天然气股份有限公司石油化工研究院,北京100195

出　　处：《化工进展》2013年第3期527-532,共6页Chemical Industry and Engineering Progress

基　　金：国家973计划(Grant 2009CB219903);国家自然科学基金(21106176);中科院校长基金项目(Y15101JY00)

摘　　要：以水、乙醇、正丙醇、异丙醇、乙酸和丙酮为研究目标,使纯液体与其气相在密闭容器中达到静态气液相平衡。用恒温水浴振荡床使气液相平衡体系以一定速度做回旋运动,研究流动对单组分气液相平衡体系压力变化的影响。实验共选取8个温度,从10～80℃每隔10℃选取一个;14个实验振荡速度,从80～210 r/min每隔10 r/min选取一个。在实验条件下,体系动态平衡压力与相平衡压力的偏移率(R)与实验温度和湍动程度成正比,这一数值最大可达74.20%。在实验数据的基础上,拟合出了R与雷诺数和对比温度的关联式。通过该关联式,可以预测当湍动程度足够剧烈时,液相的动态饱和蒸汽压可达静态数值的两倍以上。Six pure liquids, namely, water, ethanol, normal propyl alcohol, isopropyl alcohol, acetic acid, and acetone, were selected to be the experimental subjects of this research. Each one-component vapor-liquid equilibrium system was placed in a customized vessel and then rotated at a constant-temperature water bath shaking table. The experiments were conducted at eight different temperatures, from 10 ℃ to 80 ℃, with 10 ℃ intervals, and fourteen different rotating speeds, from 80 r/min to 210 r/min, with 10 r/min intervals. The deviation rate of the dynamicsystem pressure from the thermodynamic system pressure ？ in turbulence under experimental conditions could reach a maximum of 74.20%. A correlation of R, Reynolds number, and critical temperature was fitted by using experimental data. Based on the study results, a prediction was given that the dynamic statured vapor pressure could be twice of the thermodynamic one, as long as the degree of turbulence is sufficiently high.

关 键 词：单组分气液相平衡 饱和蒸汽压 湍流 对比温度 

分 类 号：TQ016[化学工程]