Comparative study on single-phase flow and heat transfer of different cross-section rib-soft tail structures
Enhanced heat transfer technique using vortex-induced vibration is an effective way to realize the cooling of heat exchange equipment.In this paper,based on the arbitrary Lagrange-Euler(ALE)algorithm,the two-way fluid-structure-interaction and heat transfer problem in the channel of rib-soft tail structure with different Reynolds numbers,different cross-sectional shapes,and different length-to-diameter ratios is investigated by using numerical simulations with dynamic mesh and overset mesh technique,and the main research objects are the flow and heat transfer characteristics around the rib-soft tail structure,the heat transfer characteristics of the ribbed heated wall,and the integrated flow and heat transfer capacity of the whole channel.The simulation working conditions are:Reynolds number Re=200,275,351;rib cross-sectional shapes:circular and square;length-to-diameter ratio k=2,3,4.The results show that,at Reynolds number Re=275,the flow-heat transfer capability of the rib-soft tail structure with circular cross-section is better than that of the structure with square cross-section,and the rib-soft tail structure with circular cross-section is optimal when the length-to-diameter ratio k=3;and the local heat transfer capacity around the rib is better for square cross-section structure than for circular ones.With the increase of Reynolds number at the length-to-diameter ratio k=3,the combined flow-heat transfer capacity of rib-soft tail structure with different cross-sections increases gradually.Moreover,the integrated flow heat transfer capacity of circular cross-section with high Reynolds number and high length-to-diameter ratio is the best.Comparing the flow-heat transfer capacity with a rib structure without soft tail,for the circular cross-section rib structure,the integrated heat transfer capacity increases by 19.46%after adding the soft tail structure,whereas for the square cross-section rib,the capacity decreases slightly after adding the soft-tail.This provides a theoretical basis for studying the cooling design of heat exchange equipment.
arbitrary Lagrange-Euler Algorithmdynamic meshnumerical simulationelasticitylaminar flowheat-fluid-solid couplingenhanced heat transfer
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