基于非稳态传质问题反演水蒸气等效传质系数

Equivalent Mass Transfer Coefficients of Water Vapor in Joint-pipe based on Inverse Problem of Humidity Transfer in Non-steady State

基于非稳态湿度传递反问题,具体提供了一种反演水蒸气等效传质系数的方法。以连通管为实验物系,其步骤主要包括:1)正问题:针对非稳态湿度传递问题,采用扩散实验方法获得被测点的瞬间湿度值;建立非稳态湿度传递模型,将传质系数作为优化变量,用有限差分法获得当前稳定的瞬时湿度场;2)反问题:将模拟值与实验值之间的水蒸气浓度差值作为目标函数,并将其极小化,得到最优解;3)针对连通管的水蒸气等效传质系数问题,得到该反演方法的适用条件(d≤8mm,L≥90mm),并分析得到该方法具有高效性和可靠性。

Based on the inverse problem of humidity transfer in the non-steady state, a method for retrieving the equivalent mass transfer coefficient of water vapor is provided. With the joint-pipe as an example, the steps mainly include： （1） Direct problem： for the humidity transfer problem in non-steady state, the instantaneous humidity value of measured point is acquired using diffusion experimental method; It is acquired to establish of humidity transfer model in non-steady state and then make the mass transfer coefficient as optimization variable, using t-mite difference method to obtain the stable instantaneous humidity field; （2） Inverse problem： it is acquired to make the difference of water vapor concentration between the measured calculated values with measured values as the optimization objective function. The optimal solution can be obtained by minimizing the objective function; （3） For the equivalent mass transfer coefficient of water vapor of in the joint-pipe, the applicable condition of the inversion method is obtained, as d≤ 8 mm,L≥ 90 mm and the efficiency and reliability of the method are analyzed.