Heat transfer in a dimpled channel: combined influences of aspect ratio, temperature ratio, Reynolds number, and flow structure

Investigation to Compare Heat Augmentation From Plane, Dimpled and Perforated Dimple Rectangular Fins Using Ansys

“…Nikolai Kornev [6] examined vortex structure and heat transfer augmentation in turbulent flow over staggered dimple array in narrow channel using Large Eddy Simulation. Mahmood and Ligrani [7] carried out an experimental analysis on the influence of dimple aspect ratio, temperature ratio, Reynolds number, and flow structure in dimple channel. Z Wang [8] carried out Numerical simulation of laminar channel flow over dimple surface and identified a symmetric 3D horseshoe vortex inside a single dimple.S.L.Borse and I.H Patel [9] performed an experimental study on the effect of dimples on heat transfer over flat surface under forced convection.…”

An Experimental Study on Heat Transfer Enhancement of Flat Plates Using Dimples

“…Mahmood et al [6] conducted an experiment to investigate the effect of dimples on heat transfer using the flow visualization techniques and concluded that the periodic nature of shedding off of vortices is the main cause of enhancement of heat transfer (much more pronounced at the downstream rims of the dimples). Mahmood et al [7] conducted an experiment to study the effect of Reynolds number, aspect ratio, and temperature ratio in a channel with dimples. They observed through the flow visualization techniques that the secondary vortices that are shed off from the dimples become stronger as the nondimensional channel height to dimple diameter (H/D) ratio decreases and increases the local Nusselt number in these regions.…”

Numerical Study on the Effect of Tube Rows on the Heat Transfer Characteristic of Dimpled Fin

“…Chen et al [2] investigated the heat transfer performance of different dimple structure and proposed a correlation which could predict heat transfer coefficient and friction factor accurately. Mahmood and Ligrani [3,4] compared flow characteristics of dimple channel or without dimple channel. Their results showed that the dimples could produce vortex, secondary flow structure, and flow mixing, and the vortex pairs were periodically shed from the dimples and become stronger as the ratio of channel height to dimple diameter decreased.…”