The Effect of Obstacles on Forced Convection Heat Transfer between Two Parallel Plates

The effect of protruding and recessed obstacles on the rate of convective heat transfer in a forced flow between two parallel plates using the k-epsilon turbulence model in a numerical approach was carried out for the present work. It has diverse applications in engineering areas, such as HVAC. A rectangular channel with various arrangements and shapes of obstacles, made of aluminum and using air as the working fluid, was employed for the simulation. Results indicate that obstacle arrangement, size, and shape play crucial roles in heat transfer enhancement as follows. A ۳.۵% increase and a ۹% decrease in convective heat transfer are observed for the bumps and small bumps geometries, respectively, compared to the simple geometry. Irregular obstacle arrangements enhance heat transfer compared to regular ones. Protruding obstacles increase the Nusselt number near the obstacle but decrease it near the wall due to vortex formation. Increasing the number of obstacles lowers the Nusselt number near the obstacle, but the overall heat transfer increases. The findings contribute to optimizing designs for heat exchangers and cooling systems, emphasizing the importance of turbulence-inducing structures for improved thermal performance.

کلیدواژه ها:

obstacle ، k-epsilon ، turbulence ، forced convection