Bagriy P. Heat transfer and aerodynamics of packages of flat-oval tubes with partial finning

The aim of the thesis is a solving of the important task to develop and create the scientific background of the new type of heat transfer surfaces, the implementation of which will lead to significant material and energy resources savings. The comprehensive experimental research of heat transfer and aerodynamic resistance of taggered and corridor packages of flat oval tubes with partial finning within the important practical ranges of values of their geometrical and operational characteristics is carried out. Obtained are the summarized similarity equations for convective heat transfer and pressure loss, which take into account the dependence of the degree at the Reynolds number from the coefficient of finning and the ratio of the cross and longitudinal pitch of tubes. Analyzed is the dependence of thermal and aerodynamic characteristics on the geometrical parameters of finned tubes and packages. Proposed is the approximate method for calculating the efficiency koefficient of fins of flat-oval tubes. The comparison of the characteristics of heat transfer surfaces with flat-oval tubes with partial finning with the surface characteristics based on the other common types of finned tubes is carried out.