Cooling and heat transfer efficiency of a Newtonian fluid in a vented duct

Abstract

Mixed convection is studied numerically to investigate the performance of the better heat transfer and also the effective cooling in a vented cylinder cavity, which is covered by two rotating discs. An external airflow enters the enclosure through an opening in the bottom vertical side and exits from another opening in the top of the opposite vertical one. The bottom disc is kept at a constant temperature, while the other sides are adiabatic. CFD code is used to solve the governing equations (continuity, momentum, and energy equations). The calculus is carried out for different values of Ri = Gr/Re² (0.1 ≤ Ri  ≤  20). Nusselt numbers, velocity and temperature profiles, and heat transfer rate are presented and compared to the literature.