Journal of Microwave Power and Electromagnetic Energy (JMPEE)
TITLE	Performance of a Heat Pipe in A Microwave Field [PDF]
AUTHORS	G.T. Colwell and J.A. Santander-Palmero 1975 10 4 369-432
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Abstract This paper describes a study of the feasibility of cooling high power microwave windows with heat pipes. The concept involves replacing a single conventional window with two thin windows which are separated in a manner to form-with the wave guide-an internal cavity where heat pipe operation occurs. The internal cavity is lined with a thin layer of capillary material and a working fluid is introduced. Thermal energy generated in the windows is conducted in the axial direction into the heat pipe cavity where it is transferred to the inside surface of the wave guide. The energy is then conducted in a radial direction through the wave guide and removed by conventional cooling techniques from the outer surface of the wave guide. Theoretical expressions have been developed for predicting thermal burnout fluxes, thermal resistances and vapor conditions during normal operation, and maximum working fluid head rises during vertical operation. A thermal test rig has been designed and fabricated which simulates actual operation of the device when microwave signals are transmitted. Preliminary testing has been accomplished and the results are very encouraging.