Gheorgalina E. Modelling and optimization of film coolers.

In the dissertation the engineering method of calculation of economically rational film coolers is developed with the account of hydrodynamic and heat-and-mass-transfer processes in a contact device of film equipment. The optimal design problem is reduced to the extremum problem of minimization of objective function of expenditures including capital investment and operation expenses referred to e year. Such an approach to the problem is conducted for the first time. The mathematic modeling of the film-jet gravitation stream of liquid along a hollow of corrugated surface is carried out. It is first ascertained that hydraulic resistance on the rough wall consists of three constituents: quadratical resistance, viscous resistances and friction of slide. It was worked out the method of solving the particle derivatives differential problem describing heat-and-mass transfer at cross-flowing liquid and gas for direct and indirect evaporating cooling. The optimal design of film coolers for counter-and-cross-flowing models of phases interaction was conducted.