ISSN オンライン: 2688-7231
ISBN 印刷: 978-1-56700-497-7 (Flash Drive)
ISBN オンライン: 978-1-56700-496-0
Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019)
EXPERIMENTAL ANALYSIS OF SPRAY IMPINGEMENT COOLING USING NANOFLUIDS
In the field of high heat flux application, Spray impingement technology acts as an effective cooling method. It plays a vital role in industries like heat treatment of steel plates, nuclear power, coal gasification, etc. From research papers, it has been concluded that nanofluids have enhanced thermal properties than base fluids. So in this experiment Al2O3, TiO2, and hybridized Al2O3 - TiO2 nanofluids at different volume concentrations were used. The nanoparticles were prepared by using the high energy ball milling technique at 300 rpm with the ball to powder ratio of 10:1 and were characterized by using XRD, SEM, TEM and were found to be in the range of 30nm-50nm. These nanoparticles were suspended in water by addition of polyvinyl alcohol of 3% for making it stable. The densities, viscosity, thermal conductivity, the specific heat of the nanofluid were calculated using different models. The heat transfer study was carried out on an electrically preheated iron plate of dimensions 100mm × 100mm × 8mm at different temperatures of 200°C, 150°C & 100°C on the fabricated experimental setup. Spray impingement uses the liquid's momentum emerging through the nozzle and break it up into droplets and impinge them singly on the hot surface. The cooling rate, the effect of air pressure on the cone angle and cooling rate were analyzed. Hence from the experiment, the most suitable nanofluid for effective cooling was determined by analyzing their cooling curves and convective heat transfer coefficients.