CAJ | 학술논문

利用CFD软件Fluent,通过数值模拟方法研究了溴化锂溶液降膜吸收过程。模型中考虑了界面切应力对于降膜吸收特性的影响,给出了不同界面切应力下主体温度、浓度随着下降距离的变化及热量、质量通量随着下降距离的变化。模拟结果表明：切应力对降膜吸收过程有一定的影响。与无切应力相比,正向切应力对降膜吸收过程不利,而逆向切应力对降膜吸收过程有利。这主要是由于切应力的存在改变了液膜内的速度分布及液膜在吸收器内的停留时间。
이용CFD연건Fluent,통과수치모의방법연구료추화리용액강막흡수과정。모형중고필료계면절응력대우강막흡수특성적영향,급출료불동계면절응력하주체온도、농도수착하강거리적변화급열량、질량통량수착하강거리적변화。모의결과표명：절응력대강막흡수과정유일정적영향。여무절응력상비,정향절응력대강막흡수과정불리,이역향절응력대강막흡수과정유리。저주요시유우절응력적존재개변료액막내적속도분포급액막재흡수기내적정류시간。
Using CFD (computational fluid dynamics)software Fluent,numerical simulation of aqueous lithium bromide falling film absorption is conducted. In the present model, effect of interfacial shear stress on the performance of falling film absorption is considered.Profiles of bulk temperature and concentration against downstream position are presented.So are heat flux and mass flux.The experimental results indicate that shear stress has some effects on absorption process. Compared to that without shear stress,positive shear stress deteriorates the absorption process while negative shear stress enhances the absorption process,which can be explained that shear stress changes the velocity profiles in the falling film and resident time of liquid film in the absorber.