Meiris A. Heat transfer and thermo-hydraulic performance of a tube bundles with surface indentations

The dissertation is devoted to the experimental and theoretical study of heat transfer and hydrodynamics at the cross-flow of a single tube and a tube bundle with surface indentations. Heat transfer and hydrodynamics were studied theoretically at the cross-flow of a single tube with surface indentations in the form of a truncated cone using the ANSYS CFX computer package. Verification of turbulence models is carried out. The results of studies of the vortex structure of the flow, the point of separation of the flow, the zone of reverse flows, the coefficient of the frontal resistance, and the heat transfer coefficient are given. Experimental and theoretical investigations of heat transfer and hydrodynamics are carried out at the cross-flow of a five-row tube bundle with surface indentations. The data on the coefficients of the hydraulic resistance of the bundle and of the heat transfer coefficients for rows and for the whole bundle are obtained. Verification of the computer model by experimental data is carried out. An engineering method for calculation of the gas turbine plant recuperator was developed and an estimation of the decrease in its mass due to the application of depressions was made.