Abstract:

Arranging longitudinal vortex generators is an efective non-source method to enhan ce heat convection.In this paper,the PHEONICS calculating software is used to numerically simulate the natural heat convection on the vertical plate reinforced with longitudinal vortex generators.The simulated results accord well with the experimental results.Th en,a simulation investigation into the geometrical factors an d the generator arrangement is conducted.It is indicated that(1)the longitudinal space will afect the heat convection when the longitudinal vortex generators ale of a multi-low arrangement;(2)when is 35 mm,the average heat exchange coeficient reaches the maximum value;(3)in the sanle geometrical condition,the stagger arrangement oflongitudinal vortex generators results in a better total heat exchange efect than the in-line arrangement;and(4)as to the stagger arrangement of longitudinal vortex generators with a winglet width of 20 ram,both the winglet height and the transverse space influence the heat
exchange efect,and the optimal winglet height and transverse space are respectively 20mm and 90mm.

Key words: longitudinal vortex, natural heat convection, enhanced heat exchange, numerical simulation