Periodic Heat Transfer Characteristics in a Square Channel with Various RVG Positions
Keywords:
Forced convection, Heat transfer characteristics, Periodic Heat transfer, Rib, Vortex generatorsAbstract
This article, 3D numerical investigations on heat transfer behaviors and thermalperformance in a square channel with rib vortex generators (RVG) are presented. The effects of the RVGs with different gap ratio (g/H = 0 – 0.35) for the heat transfer profiles with constant blockage ratio (b/H, BR = 0.15), the pitch ratio (P/H, PR = 1) and flow attack angle (α = 30o) in an isothermal wall square channel are investigated for Reynolds number based on the hydraulic diameter of the square channel, Re = 100 – 1200. The SIMPLE algorithm and finite volume method (FVM) have applied for the computational domain. The mathematical results show that the RVGs with various positions produce the periodic profiles and the fully developed periodic profiles around the 2nd module and 6th – 9th module, respectively. The use of the RVGs performs a higher heat transfer rate than the smooth channel with no RVG in all cases. The enhancement of the heat transfer rate is around 1 – 9 times over the smooth channel depended on the g/H values and Reynolds numbers. Additionally, the thermal enhancement factor, TEF, is found to be maximum around 4.05 at g/H = 0.10 and Re = 1200.
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