Comprehensive investigation of startup regimes for a frozen heat pipe

The authors describe results of an experimental investigation of startup of an ammonia heat pipe made of aluminum with longitudinal channels and radiative heat rejection. They determine the influence of the startup dynamics of the location of the frozen heat transfer agent and the slope of the heat pipe to the horizontal. They propose a simplified method of determining the startup characteristics when the main mass of heat transfer agent is frozen in the heater zone.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 59, No. 5, pp. 786–791, November, 1990.