水平管降膜蒸发换热特性的模拟研究  

SIMULATION ON HEAT TRANSFER CHARACTERISTICS OF HORIZONTAL TUBE FALLING FILM EVAPORATION

作　　者：李强[1] 蒲亮[1] 邵翔宇 丁岚 Li Qiang;Pu Liang;Shao Xiangyu;Ding Lan(Institute of Refigeration and Cryogenic Engineering,Xi'an Jaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学制冷与低温工程系,西安710049

出　　处：《太阳能学报》2020年第6期341-347,共7页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51641608)。

摘　　要：水平管降膜蒸发器广泛应用于海水淡化和石油化工行业。该文建立二维数值模型,使用CFD软件结合UDF程序对水平管降膜蒸发的传热传质过程进行数值模拟,并且将换热系数作为指标与实验进行对比验证。结果显示:在一定范围内,换热系数随着雷诺数或者饱和温度的增大而增大,而最大壁面剪切力出现在105°~120°之间;Re=2000较Re=1000对应的平均换热系数增大约9.8%,壁面剪切力最大值增大约6.3%。363.15 K饱和水较323.15K饱和水对应的平均换热系数增大约8.3%,壁面剪切力最大值减小约25.7%。Horizontal tube falling film evaporators are widely used in seawater desalination and petrochemical industry.A two-dimensional numerical model is established which uses CFD software and UDF program to simulate heat and mass transfer process,and the heat transfer coefficient results are validated by experimental data.It is confirmed that the heat transfer coefficient increases with the larger Reynolds number and saturation temperature.The maximum wall shear force appears between 105 and 120 degrees.When the value of Reynolds number increases from 1000 to 2000,there is an increment of 9.8%and 6.3%of average heat transfer coefficient and maximum wall shear stress,respectively.Besides,average heat transfer coefficient has an increase of 8.3%as the saturation temperature range from 323.15 K to 363.15 K,and maximum wall shear stress decreases by about 25.7%.

关 键 词：海水淡化 计算流体动力学 换热系数 降膜蒸发 水平管 

分 类 号：TK221[动力工程及工程热物理—动力机械及工程]