Heat transfer enhancement

Heat transfer enhancement in a channel flow with RVG and FVGs (Jeong et al. 2022, IJHMT) IJHMT:  International Journal of Heat and Mass Transfer, RVG: rigid vortex generator, FVG: flexible vortex generator

• A heat transfer system to improve the thermal performance of a channel flow with two symmetrically wall-mounted flexible flags is proposed by arranging a confined cylinder in an upstream region of the flags. 

• Heat transfer systems consisting of a cylinder and two flags achieve improved thermal efficiency compared to that for a clean channel system due to vortex-to-vortex interactions promoting fluid mixing between the core cold fluid and near-wall hot fluid.

• When the values of Gx, γ and the Reynolds number are optimal, the present system in the OS mode results in an increase of the heat transfer rate by approximately 177% with an accompanying increase of the thermal efficiency up to 24% compared to that for the clean channel system (despite an increase of the mechanical energy loss of 1021%). Gx: streamwise gap distance between RVG and FVGs, γ: bending rigidity of FVGs