Air Atomized Spray with Additives: A Novel Cooling Methodology for the Development of Nanosteel

Abstract

The effect of varying liquid-solid contact angle on the evaporation time of a single droplet of water deposited on a (AISI-304) steel surface is studied. Mathematical modelling for the evaporation life time of a water droplet added with additives is done. Conventional cooling methodology cools at the rate of around 30oC which is not sufficient enough for the production of Nanosteel. Contact angle is varied in experiments by adding varying amounts (500, 1000 and 1500 ppm) of surfactant, salt and alcohol to the water. The contact angle is measured by Goniometer. Reduction in the contact angle results in increase of the contact area between the droplet and solid surface. Reduction in the contact angle also reduces droplet thickness, enhancing heat conduction through the droplet. Both the effects increase the droplet evaporation rate. Reduction in droplet evaporation life time is achieved by varying the contact angle from 900to 490. Different types of additives were added to water and their effect on the contact angle was calculated.