Numerical Simulation of Flow and Heat Transfer in Various Configurations of Longitudinal Vortex Generators
In order to further explore the potential of heat transfer enhancement of delta winglet longitudi-nal vortex generators arranged on two opposite walls,the flow and heat transfer of five longitudinal vortex generator configurations including common-flow-up configuration on one wall,common-flow-down configu-ration on one wall,common-flow-up configuration on two walls,common-flow-down configuration on two walls and mixed configuration were studied by numerical simulation in the range of Reynolds number from 3 000 to 18 000.The results show that the longitudinal vortex can improve the field synergy effect.The heat transfer intensity not only depends on the secondary flow intensity in the channel,but also depends on the field synergy;among all configurations,the mixed configuration has the highest secondary flow in-tensity,the best field synergy effect and the best heat transfer performance,which can increase the Nu of the smooth channel by 28.3-35.3％.The other four configurations can increase the Nu of the smooth channel by 21.4-32％,20.0-29.2％,26.3-34.3％and 23.7-28.0％,respectively;mixed con-figuration with Re＜6 000 is recommended,which has a TPF of 1.03-1.10 and a Nu/Nu0 of 1.32-1.35.
longitudinal vortex generatorconfiguration schemesecondary flowfield synergyflow and heat transfernumerical simulation
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