内含质量源的水工质在加热管道中的紊流对流传质研究

TURBULENT CONVECTIVE MASS TRANSFER OF WATER WITH INTERNAL MASS SOURCES IN HEATED TUBES

简述了由结晶析出形成内部质量源的数理模型；在常物性条件下，考虑有内部质量源时，对水中的金属腐蚀物杂质在加热管道中的紊流对流传质进行了理论分析和数值计算；研究了内含质量源的紊流对流传质的规律和特点。

A turbulent model of convective mass transfer and a model of internal mass sources resulted by crystallization are presented. The theoretical analysis and numerical calculation are carried out for turbulent convection mass transfer in heated tubes with consi deration of internal mass sources under constant properties. The influence of internal mass sources on the concentration distribution, average concentration of colloidal particals and mass flux on the wall has been analyzed. It has been found that if the mass transfer coefficent in the case with consideration of internal mass sources is defined as Eq.(20), the Sherwood number and mass transfer coefficient in the case with consi deration of internal mass sources are equal to those in the case without consideration of internal mass sources; Under the conditions studied here, I sc m, the effect of I s on mass transfer can be neglected; In the case when considering internal mass sources the mass flux may increase gradually along x due to increase of c m.