Amnart Boonloi, Withada Jedsadaratanachai

Frontiers in Heat and Mass Transfer (FHMT) 13 - 28 (2019)

This paper presents the numerical investigations on flow structure, heat transfer behavior and performance assessment in heat exchanger square channel placed with 30^o inclined square ring (ISR). The influences of ring size and placement on flow and heat transfer characteristics are considered for laminar flow region with the Reynolds number in the range around 100 – 2000. The purpose for the insertion of the ISR in the square channel is to induce the vortex flow and also increase the turbulent mixing. The numerical result reveals that the ring size and location have effects for the changes of the flow and heat transfer behavior in the tested section. The present of the ISR in the tested section gives the maximum heat transfer rate around 8.13 times above the smooth square channel. In addition, the optimum thermal performance is around 3.10 when compared at similar pumping power.