质量传递过程中的场协同作用

依据三传现象的类比规律，由质量方程导出了各种情况边界层传递的对流传质量与贴壁层扩散量的关系，提出了当量内部生成率即当量源的概念及通过源强化增强传质的结论，且源的强化不是通过常用增加能耗的方法而是改变主要变量即速度场和密度梯度场夹角来强化。该文进行了复杂极端情况下的数值模拟，在平板左侧，Pem增大至7时，使边界层变得很薄，最大程度地强化了质量传递；在平板右侧，Pem增大至7．5时，大大促使边界层增厚，弱化了质量传递，减少了质量流密度，使其效果远不如静止扩散的传递效果。因此可进行涉及传质过程的场协同分析和优劣评价及方法改进，并为传质设备的设计优化和运行提供科学指导。

FIELD SYNERGY ACTION IN MASS TRANSFER PROCESS

The relationship between convective mass transfer properties and diffusion properties of next-to-wall boundary layer is derived from mass equations, and a novel concept of equivalent internal productivity is presented. The conclusion of enhancing mass transfer is obtained by the new method of enhancing the productivity. The productivity is enhanced or reduced by adjusting the angle between two main variables, velocity field and density gradient field, instead of increasing energy consumption. The numerical simulation was carried out by an extremely complicated case. In the case,on the left side of the vertical wall, its boundary layer becomes thinner when raising to Pem=7, and then it strengthens mass transfer. On the right, the boundary layer becomes thicker when raising to Pem=7.5, which greatly reduces mass transfer. By applying the field synergy method, mass transfer process in common use can be analyzed, the condition of mass transfer equipments be evaluated and their work methodologies be improved. Therefore, the synergy method of mass transfer provides scientific direction in optimization, design and operation of mass transfer devices.