中文摘要：

本文采用数值方法研究了建筑室内同时存在温度梯度、湿度梯度和有机污染物（VOCs）浓度梯度时的自然对流传热传质现象,展示了流场、温度场和浓度场等随浮力比NC的变化状况,考察了多物理场（空气、水蒸气和VOCs）中交叉耦合扩散效应对流动和传热传质的影响特征,探讨了边壁处的无量纲传热努谢尔特数和传质舍伍德数的变化规律。

英文摘要：

The cross diffusive effects on natural convection in a room are investigated in this paper. The mathematical model for multi-component system （VOCs, dry air, water vapor） is solved numerically by FEM method. Profiles of dimensionless velocity, temperature and concentration are shown graphically for different values of buoyancy ratio Nc. The effects of cross-diffusion parameter STC and GHC have been examined on the flow field and heat and mass transfer. Finally, the average Nusselt number and Sherwood number closed the bottom wall are presented respectively.