传质势容耗散极值原理及通风排污过程的优化

为了获得排污效率较高的室内通风方式,本文将传热势容耗散极值原理应用到对流传质过程分析,定义了传质势容耗散函数,并利用变分原理在给定条件下对耗散函数求极值,获得了场协同方程,求解场协同方程获得了最佳流场,使传质势容耗散取得极小值,室内污染物浓度最低.这些结论对通风排污过程的分析与优化设计有重要指导意义.

MASS TRANSFER POTENTIAL CAPACITY DISSIPATION EXTREMUM PRINCIPLE AND DECONTAMINATION VENTILATION OPTIMIZATION

In the interest of designing an efficient ventilation arrangement to decrease contaminant concentrations,the heat transfer potential capacity dissipation extremum principle is extended to convective mass transfer analysis.The mass transfer potential capacity dissipation function is defined, and then the convective mass transfer field synergy equation is obtained by seeking the extremum of the mass transfer potential capacity dissipation function for some constraints.This equation can be solved to obtain an optimal velocity distribution to decrease the mass transfer potential dissipation and the contaminant concentration.These results provide guidance for optimizing ventilation system designs.