Numerical Modelling and Experimental Testing of Heat Exchangers

Introduction.- Mass, momentum and energy conservation equations.- Laminar flow of fluids in ducts.- Turbulent fluid flow.- Analogies between the heat and the momentum transfer.- Developed turbulent fluid flow in ducts with a circular cross-section.- Basics of the heat exchanger modelling.- Engineering methods for thermal calculations of heat exchangers.- Mathematical models of heat exchangers.- Mathematical modelling of tube cross-flow heat exchangers operating in steady-state conditions.- Assessment of the indirect measurement uncertainty.- Experimental testing of heat exchangers.- Determination of the local and the mean heat transfer coefficient on the inner surface of a single tube and finding experimental correlations.- Determination of mean heat transfer coefficients using the Wilson method.- Determination of correlations for the heat transfer coefficient on the air side assuming a known heat transfer coefficient on the tube inner surface.- Parallel determination of correlations for heat transfer coefficients on the air and water sides.- Determination of correlations for the heat transfer coefficient on the air side by means of CFD simulations.- Automatic control of the liquid temperature at the car radiator outlet.- Final comments.