Effect of polymer additive on the cooling rate of a hot steel plate by using water jet

The current research focuses on the enhancement of heat transfer of a hot steel plate by introducing polymer additive, polyvinylpyrrolidone (PVP) in jet cooling. The characterization of PVP solution has been done in order to understand the reason for increment in heat transfer. The concentration of PVP has been varied at levels ranging from 50 to 150ppm along with the variation of flow rate from 13.3×10^-5 to 33.33×10^-5m³/s (8 to 20lpm). The results indicate that the addition of PVP in water jet leads to an appreciable increase in cooling rate and surface heat flux compared to that of water which leads to lesser coolant consumption. A PVP concentration of 110ppm in water is found to provide a maximum cooling rate of 231°C/s and a maximum critical heat flux of 3.01MW/m² which are higher than that of water by 111.18% and 19% respectively.