LAMINAR FLUID FLOW AND HEAT TRANSFER CHARACTERISTICS OF WAVY MICROCHANNELS WITH WALL PHASE SHIFT
The present study numerically investigates the influence
of wall phase shift on the thermal-hydraulic behaviour of
steady laminar fluid flow in a sinusoidal wavy walled microchannel. A 3D conjugate analysis has been carried out
with 7 different configurations, having wall phase shifts, φ = 0°,30°,45°,60°,90°,135° and 180°, over a low Re range of 50 to
200. The channel is considered to be made of copper and water is taken as the working fluid. The numerical schemes have been successfully validated with experimental results from past studies of flow in micro-channels. It has been observed that in the low Re regime, φ = 60° channel has the best heat transfer characteristics.
As the Re increases, φ = 0° has been found to perform better. The increase in heat transfer coefficient at φ = 60° is attributed to the increase in strength of the dean vortices causing better mixing of flow due to asymmetry of the channel walls.