Thermal performance analysis of nanofluid spray impingement in heat transfer applications
摘要
Spray impingement entails creating high-velocity liquid droplets that collide with a solid surface, enhancing heat transfer via convective mechanisms. Utilizing nanofluids in spray impingement scenarios presents numerous benefits compared to traditional heat transfer fluids. The diminutive dimensions of nanoparticles enable enhanced contact between the fluid and surface, thereby facilitating improvement in thermal energy transfer. In this experiment, the impact of volume concentration on various properties of nanofluids was investigated. It was observed that the density of the nanofluid increased in proportion to the volume concentration. Notably, the copper oxide-water nanofluid exhibited the highest density compared to all others. Furthermore, the thermal conductivity of nanofluids increased with volume concentration, particularly for the titanium dioxide-water nanofluid, which demonstrated the highest growth. Conversely, viscosity varied considerably and was primarily determined by the volume concentration of nanoparticles and base fluid viscosity. The specific heat magnitude decreased with an increase in density, with copper oxide-water nanofluid having the lowest and aluminium oxide-water nanofluid having the highest. Nanofluids were found to possess higher cooling rates compared to water, and the cooling rate correlated positively with thermal conductivity. In arranging the cooling rates in ascending order, it is observed that the water-based titanium dioxide-water nanofluid exhibits enhanced heat transfer.