An Experimental Analysis of Microchannel Heat Sink using Novel Geometry with Nano Fluid and Water

Abstract

Oblique fins with sectional cuts are used in place of continuous straight fins to better mix the fluid because of secondary flow in tilted cut oblique channels. The other factor is the re initialization of thermal as well as hydrodynamic boundary layer at the noted line of each fin which decline the density of boundary layer. These breakages of continuous fins resulted in secondary flow generation which enhances the heat transfer rate with reasonable pressure drop. Wavy channel novel geometry is also studied which utilises the length wise blend due to curvy geometry. For laminar region, the amount of convective heat transfer is a function of span wise fluidic mixing. Dean vortices which are cajoled due to centrifugal fluctuation increases the heat transfer capabilities. By clubbing the benefits of both novel geometries i.e. Dean vortices with secondary channel mixing a further better novel geometry branched wavy structure is developed whose fluid movement and heat transfer behaviors were examined numerically. Secondary branches are combined in an alter manner at 45^0 at the trough of the wavy channel to provide cross channel mixing. All the 3 geometries are studied at different range of Reynolds number which ranges from 240 to 600. An increase in heat transfer coefficient as compared to oblique and wavy channel was observed after the addition of secondary branches with decrease in pressure drop penalty. For simulating different geometries in ANSYS 2 methods are implemented which resulted in discrete phase modelling being the better method. The temperature, pressure, velocity contours from simulations were obtained to explain different behaviours.