GAX循环中垂直管内降膜吸收的数值模拟

基于氨水吸收式GAX循环中垂直管内降膜吸收过程中热质、传递现象的研究，以及对该过程传热和传质的分析，建立了吸收过程热质、传递的数学模型。以单级氨水吸收式制冷装置实验数据为计算初值，对垂直管内降膜氨水吸收过程进行数值计算，计算结果与实验吻合良好。选取吸收管内径、稀氨水的喷淋密度和冷却水流量3个变量，考察液膜主流的平均温度和液膜主流浓度随变量的变化关系，结果表明喷淋密度的影响较显著。

Numerical simulation of falling film absorption in vertical tubes in a generator absorber heat-exchanger (GAX) cycle

The heat transfer and mass transfer phenomena occurring during falling film absorption of ammonia in vertical tubes in a GAX cycle have been studied and a model for the transfer phenomena has been derived.The experimental data collected from a single-stage ammonia absorption refrigeration apparatus were set as the initial value and numerical data for the ammonia absorption process in the vertical pipe falling film were calculated.The results obtained agreed very well with experimental data.In addition,the changes in average temperature and concentration of the main fluid with the value of three variables,the tube diameter,dilute spray density and mass flow of the cool water were also studied.It is shown that the average temperature and concentration of the main fluid is sensible with the changing of dilute spray density.