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.

The deposit of the ferric corrosion products on surface of the tubes in boiler equipment or nuclear power station under the high pressure states will influence on operating economy of the equipment and even result in accident. The corrosion products of structure materials may be soluble or suspended in water after water treatment. The particles diameter is about 10^-3-10^-1μm. Here the conjugate problem of natural convection heat and mess transfer on a heated vertical plate subject to the boundary conditions of the first kind or mixed for water containing of the ferric corrosion products in superoritical pressure states with consideration of the states dependence of the thermal properties was reported. The mechanism of the natural convection heat and mass transfer was revealed and the influence of the states dependence of the thermal properties was analyzed quantitatively in supercritical pressure states. A correlation for natural convection heat and mass transfer in this case was recommended in this paper.