Nucleate boiling heat transfer on a small hemispherical heater and a wire under microgravity

摘要

Boiling heat transfer in a microgravity environment has been studied druing the Spacelab Mission LMS~1 in July 1996 on a small hemispherical heater of a diameter of 1.41 mm in FREON R123 utilizing the ESA facility BDPU~2. Additionally boiling heat transfer on a platunum wire with the diameter of 0.02 mm and 75 mm length in FREON R134a has been studied during an autonomous Get Away Special Flight in May 1996. The comparison with the boiling heat transfer under normal earth gravity has revealed new aspects of the heat transfer mechanisms depending on the liquid state, the subcooling of the liquid and the heat flux.