2D Numerical Study of Heat Transfer Enhancement Using Fish-Tail Locomotion Vortex Generators

Abstract

In this paper, a numerical simulation is performed to study the effect of two types of concave vortex generators (VGs), arranged as fish-tail locomotion in a rectangular channel. The heat transfer and fluid flow characteristics with and without VGs are examined over the Reynolds number range 200≤Re≤2200.The two proposed types of the VGs are selected based on the speed of the fish movement which is arranged in different distances between them (d/H=0.6, 1, 1.3). The results show that the use of VGs can significantly enhance the heat transfer rate, but also increases the friction factor. The heat transfer performance is enhanced by (4-21.1%) reaching the maximum value by using the first type of the VGs at (d/H=1.3) due to better mixing of secondary flow and the new arrangement of the VGs which lead to decreasing the friction factor with an easy flow of fluid.

Compound passive heat transfer augmentation techniques: A comprehensive review

“…They typically modify the flow channel's surface or geometry or contain an insert, substance, or device. Researchers have utilized a variety of passive techniques to boost the rate of heat transmission in a variety of thermal devices, including the use of rough surfaces, 24,25 porous materials, 26 inserts, [27][28][29][30][31] extended surfaces, [32][33][34][35][36][37][38] displaced enhancement devices (coil/helical/ spiral tube), 39,40 nanofluids, [41][42][43][44] and so on.…”