抄録
Heat transfer from transferred-type arc plasmas to a water cooled copper anode is measured with different amounts of electrical power applied by changing the arc current or gap length (arc voltage). Argon, nitrogen or helium is chosen as an arc atmosphere. In addition, heat transfer by radiation and heat transfer dominated by thermal conduction from non-transferred type arc plasmas to a water cooled copper anode are measured. Based on the results of these measurements, the mechanism of heat transfer to a water cooled copper anode and the causes of dependence of heating efficiency on experimental conditions are discussed. Nitrogen arc plasma is found to achieve highly efficient heating because of high thermal conductivity owing to dissociation and of small radiation loss. This finding is expected to be helpful for achieving more highly efficient heating.
