The Heat Transfer Phenomena by a Plasma Stream

An experimental investigation of the heat transfer flux of the supersonic plasma jet has been carried out in D. C. Argon plasma jet. Measurements of the heat transfer flux was made in this flow with the calorimetoric probe. The heat transfer flux increased significantly with the arc current. As the gas flow rate increased, the heat transfer flux was decrease untill the arc current was 80A, but for over 80A, it was increase. In the jet core, the reducing ratio of the axial heat transfer flux was large, but in the surface layer of jet core, it was small and constant indipendently of arc current. The radial distribution of the heat transfer flux was symmetric about the jet center line, and the radial heat transfer flux was maximumn value on the jet center line and suddenly reduced as deperture from the jet center line. The reducing ratio of this was approximately twenty-two times the reducing ratio of axial distribution. The integrated heat transfer flux near the nozzle exit plane was over 84% of the net arc input power, and when the arc current was 140A and Argon gas flow late was 30l/min., it was maximumn value of 89.8%.