建筑空间湿度分布特性对交叉扩散水平的影响

基于不可逆热力学分析，给出了建筑室内湿度分布特性对交叉扩散水平与特征的影响关系式，并结合室内实际的温度水平和污染气体浓度水平，进一步分析了湿度分布影响下的交叉扩散特征与水平。研究结果表明，湿度梯度与扩散附加扩散系数同号，则交叉扩散作用所形成的温度梯度和污染气体组分梯度小于零，反之则大于零；此外，在相同湿度梯度和扩散附加扩散作用下，初始温度水平和污染气体浓度水平越高，所形成的温度和污染气体组分梯度的绝对值越大，但初始温度的影响有限，而初始污染气体浓度的影响具有显著性。

Influence of Humidity Distribution on Cross Diffusion Extent in Building Space

The influencing relationship equation of humidity distribution on the characteristics and extent of cross diffusion was proposed based on the non-equilibrium thermodynamic theory. With the parameters of temperature, humidity and contaminant gas concentration, a further study on the relationship was employed. It was showed that the temperature grads and the contaminant gas mass grads were less than zero when the humidity grads and additional diffusion coefficient were both positive/negative, otherwise the two grads were more than zero. Moreover, the higher the initial temperature and contaminant gas concentration were, the greater the absolute values of temperature grads and contaminant gas mass grads were, with the same humidity grads and additional diffusion coefficient. Whereas the influence of initial temperature was limited, and that of initial contaminant gas concentration was obvious.