Numerical Analysis of Synergy Between Velocity Field and Temperature Field in Finned Tubes With Different Longitudinal Vortex Generators.

In order to explore the comprehensive properties of heat convection in H-type finned tubes installed with small rectangular wings or triangular wings as the longitudinal vortex generators, the field synergy principle was adopted in analysis. At the same attack angle, the surface average and volume average synergy angles of the small triangular wings are bigger than those of the small rectangular wings; at the same time, the volume average synergy angles are bigger than the surface average ones. With the increase of the attack angle, both the surface average and volume average synergy angles decrease first but increase later, which reach their minimum values at the 60° attack angle for the rectangular wings but at the 45° attack angle for the triangular wings. At the same inlet velocity, both the surface average and volume average synergy angles of the 45°-attack-angle triangular wings are bigger than those of the 60°-attack-angle rectangular wings. With the increase of the inlet velocity, both the surface average and volume average synergy angles increase for the 60°-attack-angle rectangular wings and the 45°-attack-angle triangular wings as well. [ABSTRACT FROM AUTHOR]