气液交叉流装置冷凝过程的传热传质特性

Characteristics of heat and mass transfer in condensation processof gas-liquid cross flow device

建立了气液交叉流冷凝过程的传热传质模型并给出其动力学参数的表达式，通过实验研究了不同工况下高温含湿气体横掠冷却液柱流阵列的热质传递特性，获得传热、传质系数。研究表明，错列排列对应的传热、传质系数值为直列排列对应值的1．2～1．4倍；液柱流动诱发气液界面附近的气体发生湍动以及气体绕流液柱引起的自身湍动，分别是低气速和高气速条件下强化气液相间传热传质的主要因素；本研究体系下路易斯准数在0．75～0．85范围内。

The heat and mass transfer models for the condensation process of liquid-gas cross flow were established mathematically, and the expressions of heat and mass transfer coefficients were obtained. The characteristics of high temperature and humidity gas that flowed across an array of liquid columns were experimentally studied in various working conditions to get the heat and mass transfer coefficient. The results show that the heat and mass transfer coefficients of the staggered arrangement are 20%- 40% higher than that of the aligned arrangement, and the gas turbulence near the gas-liquid interface caused by the flow of the liquid columns and the gas turbulence caused by the gas flow around liquid columns are the main factors that intensify the heat and mass transfer in low and high gas flow rates, respectively. The Lewis numbers in this study are between 0.75 and 0.85.