The enhancement of spray cooling at very high initial temperature by using dextrose added water. (April 2020) - Das, L.
Highlights: The dextrose added water spray enhances the heat transfer rate significantly. The highest CHF (1.4 MW/m 2 ) is achieved in case of 0.3 mol/L dextrose added water spray. Post quenching analysis of the hot plate confirms unaltered surface morphology. Abstract: In the current work, by decreasing the sensible heat extraction period and enhancing the internal energy of the evaporating droplet; the high mass flux spray cooling is enhanced with the additional advantages such as attainment of unaltered surface morphology and zero deposition of the additives on the evaporating surface. To achieve the above-mentioned requirements, dextrose is used as an additive in water, which decreases coolant temperature due to heat of dissolution. Furthermore, the exothermic reaction between aqueous glucose and oxygen fulfill the latter requirement. In the current work, the heat transfer analysis clearly depicts enhancement with respect to the heat removal rate obtained in case of cooling by pure water. In addition to the above, the post quenching surface analysis of the heat-treated steel plate assures unaltered surface morphology. The comparison of the current quenching process with the cooling processes reported in the literature clearly asserts its suitability for the fast quenching operation.