Experimental Investigation and Comparison of Natural and Forced Convective Heat Transfer Enhancement Using Water -Cuo Nano Fluid

Abstract

Free and forced convective heat transfer along a vertical cylinder immersed in water– CuO nanofluid for numerous concentrations (0, 0.05, 0.1, 0.15, 0.2vol %) below consistent heat flux circumstance turned into investigated experimentally with and without vibrations and compared the effects. The vibrational movement is acquired by way of placing vibratory motor beneath the experimental setup. The accelerometer is used to measure the vibration frequencies 100HZ-220HZ. Thermal stratification become discovered out of doors the boundary layer in the ambient fluid after steady-state condition is done as the fluid temperature is going on growing alongside the axial course. It is found that the temperatures of the cylinder and the fluid increases alongside the axial route and the fluid temperature decreases inside the radial route. Experiments had been conducted for various heat inputs (30 W, 40 W, 45 W and 50 W) and quantity concentrations and determined that the addition of Copper oxide nanoparticles as much as 0.15 vol. % complements the thermal overall performance and then the further addition of nanoparticles ends in deterioration. The most enhancement in the free convection (without vibration) i.e., the heat transfer coefficient is 478.4214 w/m2 k at 0.15 vol. % and in forced convection (with vibration) i.e., the heat transfer coefficient is 489.4614 w/m2 k at 0.15 vol. %. Thus it is observed that for the same heat input, the heat transfer enhancement is greater for forced convection in comparison to free convection due to vibratory impact.