Effetcs of geometrical factors, turbulence inlet parameters and pressure gradient on flow and heat transfer from surface mounted heated blocks in a narrow channel

In this study, effects of block placements, block height, channel height, inlet turbulence intensity, pressure gradient and conjugate state on heat transfer from block-like electronic chips are investigated computationally. All geometric factors and inlet turbulence intensity were examined for 3 different cases. The pressure gradient has been ensured with the inclined upper plate that starts just before the first block. Inclination angles of -2°, 0°, 2°, 4°, and 6° have used. The effect of two different materials, Bakelite and FR-4, was investigated for the conjugate effect. Blocks simulating electronic elements are placed to the lower surface of the canal and a constant temperature is defined for the blocks. Air is used as the fluid and the air enters the duct at a constant velocity in a uniform velocity profile. Calculations were made for Re numbers (Re= 6000, 9015 ve 11993) defined according to channel height. For this purpose, conservation and SST k-ω turbulence model equations are solved by using ANSYS-Fluent software for two-dimensional, incompressible, and turbulent flow conditions. Velocity, temperature, pressure, and kinetic energy distributions have been computed and compared for considered inclination angles. The effects of all changing conditions on the heat transfer were also discussed by calculating the local and average Nusselt values, and the recombination lengths after the last block were calculated by plotting and also comparisons were made by plotting pressure values on the block, in the middle of the channel and above the channel.