Experimental Solution and Numerical Simulation of Flow and Heat Transfer in Car Radiators in Forced and Natural Flows

In the present study, experimental and numerical studies of heat transfer in Pride car radiators were carried out. In the experimental solution, an aluminum car radiator in which the cooling fluid flows was examined under real boundary conditions. Radiator inlet and outlet temperatures were measured by two NTC sensors. In the numerical analysis, the equations of continuity, momentum and energy were used by the volume control method to numerically solve the flow with Ansys Fluent software. In this study, the effects of secondary currents and centrifugal force and buoyancy on the flow field were taken into consideration and the effect of natural and forced currents on radiator heat transfer was also investigated. The results were presented in the form of contours and diagrams of heat flux and temperature. Experiments showed the effect of forced current on the cooling system when the engine is turned off. The difference between the inlet and outlet temperatures of the motor under free circulation conditions was greater than that of the forced circulation of fluid. The results also demonstrated that the difference between the inlet and outlet temperatures of the engine under free convection in the experimental solution was 13 ° C and in the numerical solution 12.1 ° C while in the forced convection of the fluid, the difference between the inlet and outlet temperatures in the experimental solution was 1.5 ° C and in the numerical solution 1.8 ° C. Due to the long shelf life of the radiator, the differences between the inlet and outlet temperatures of the radiator was large.