Investigation of heat transfer enhancement of heated block by using baffles

The present study is concentrate on the effect of using baffles in a rectangle duct to enhance the heat transfer over heated blocks. For this purpose, an experimental and numerical study implement. In the experimental study, a test rig is consisting of a rectangular duct and square baffle which are attached at the top wall at mid positions between two heated blocks with a constant heat flux apply at the bottom wall is built up and using. In the numerical study, mesh generation and finite volume analysis are perform by using ANSYS-Fluent 22(R2) with (k-ε Realizable) turbulent model to calculate the pressure drop, temperatures, and heat transfer rate. The study is concentrate on the effect of baffle position, and number for the range of Reynolds number (12000-28000) and using air with (Pr=0.72) as a working fluid. The results show that inserting a square baffle at the center heated block of the duct leads to increasing the Nusselt number by (62%) comparing to that duct with no baffles and (54%) with that at high (11.25 cm) and center position for the heated block. Comparing numerical and experimental shows a good agreement between them with a maximum deviation (8%), also a close agreement notice when comparing the present results with some of the previous works.