Determination of Cooling Rate of Palm Kernel Oil as Jet Impingement Fluid

Abstract Determination of cooling rate using Temperature-Time profile for Palm kernel oil as the impinging fluid was carried out on a modified design run-out table. A stationary rectangular hot steel plate, for the top surface single palm kernel oil jet controlled accelerated cooling process was studied experimentally using lumped thermal mass analysis. This was evaluated with pipe diameters of 10mm, 15mm, 30mm, 35mm, and 40mm, impingement gaps of 115mm, 125mm, 135mm, 145mm, and 155mm, and initial surface temperatures from 450oC – 410oC and at sub-cooled temperatures from 150oC–110oC. The analysis, reveals an increased cooling rate with a decrease in pipe diameter, and with a corresponding decrease in impingement gap. Diameter 10mm showed 1.9oC/sec and 1.6oC/sec for impingement gaps of 115 and 155mm respectively. Correspondingly, a diameter of 40mm showed the same pattern of 3.1oC/sec and 2.9oC/sec for impingement gaps of 115mm and 155mm respectively. This best temperature-time profile of Palm kernel oil impingement cooling rate infers that a higher cooling rate is achieved using bigger pipe diameter D and lower impingement gap H. In addition, it showed evidence of less Leidenfrost phenomenon; hence, palm kernel oil can seamlessly aid as a substitute for water for better microstructure steel grade to the designer’s desired application.