薄膜蒸发器内流场分布与传输特性数值模拟研究  

Numerical simulation of flow field distribution and transmission characteristics in thin-film evaporator

作　　者：王志文 陈入领[1] 黄瑶 邹鲲[1] 彭倚天 WANG Zhiwen;CHEN Ruling;HUANG Yao;ZOU Kun;PENG Yitian(College of Mechanical Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学机械工程学院,上海201620

出　　处：《东华大学学报（自然科学版）》2023年第2期77-84,共8页Journal of Donghua University(Natural Science)

基　　金：国家自然科学基金资助项目(51905089);上海市自然科学基金资助项目(19ZR1401500)。

摘　　要：为深化薄膜蒸发器内液料传输特性方面的研究,通过Fluent数值模拟软件建立薄膜蒸发器内气液两相流三维稳态数值模拟模型,探究薄膜蒸发器内液料的径向混合和轴向传输特性,并进一步探讨液料黏度对这两个方向传输特性的影响。结果表明:圈形波与液膜的交界处为层流且夹带大量气体;圈形波的轴向流速比液膜快,并在轴向传输过程中剪切稀化,促进液料的径向混合,液料逐渐进入液膜,圈形波当量直径不断减小;液料黏度增大后,交界处的气体夹带量增多,圈形波的尺寸随之增大但轴向减小趋势不变,且减小的速度变慢;液料黏度的增大使得圈形波与液膜间的径向混合受到抑制,圈形波逐渐变成轴向传输的主力。A three-dimensional numerical simulation model of gas-liquid two-phase flow in thin-film evaporator was established by Fluent numerical simulation software to deepen the study on liquid transmission characteristics in thin-film evaporator.The radial mixing and axial transmission characteristics of liquid and material in thin-film evaporator were investigated,and the influence of viscosity on them was further discussed.The results show that the interface between the fillet and liquid film is laminar flow with a large amount of gas;the axial velocity of the fillet is faster than the liquid film,and further shear-thinning occurs in the axial transmission process,which promotes the radial mixing of liquid.The liquid gradually enters into the film and the equivalent diameter of the fillet decreases continuously.As the viscosity of the liquid increases,the amount of gas at the junction increases,and the size of fillet increases accordingly while the trend of axial decrease remains the same,but the rate of decrease becomes slower.The increasing viscosity of the liquid material causes the radial mixing between the fillet and liquid film to be suppressed and the fillet gradually becomes the main force of axial transmission.

关 键 词：薄膜蒸发器 两相流 数值模拟 圈形波 假塑性流体 

分 类 号：TS174.1[轻工技术与工程—纺织材料与纺织品设计]