The Role of Coolant Thermophysical Properties in Case of Cooling Performed by Upward Spray

Abstract

Attaining high heat flux around 900°C temperature has been challenging for current generation researchers. Although the literature has identified several quenching methods, including upward-facing spray, downward-facing spray, and both-sides spray, upward-facing spray cooling is the most efficient. The coolant's thermophysical properties may improve upward-facing spray cooling. Thus, upward-facing spray cooling was used in this study to augment the heat transfer with better fluid properties. This study uses ethanol-added water as a coolant and heat transfer analysis to boost heat removal. The statistical analysis software (Designexpert@7.0) models an upward-facing spray and finds that for maximum heat removal the Weber and Reynolds numbers must be 700 and 2220, respectively. Fluid properties are viscosity 8660 × 10<sup>-7</sup> mPa s, density 997.7 kg/m<sup>3</sup>, and surface tension 54 mN/m. Theoretical studies and dropwise experiments were used to determine the upward-facing spray augmentation mechanism. The comparative analysis shows that ethanol is less corrosive than the additives reported in the literature. After experimentation, the total dissolved solid concentration in used water exceeds the permissible limit.