Abstract
Presented here is a study of the forces governing the liquid and vapor flow, in an external artery heat pipe. A differential analysis was performed on the heat pipe based upon the continuity and momentum equations. Using these fundamental equations, a computer model was developed, capable of predicting the fluid motion resulting from the surface tension and viscous frictional forces in a microgravity environment. The model used a nested iterative technique to first establish the pressure distribution along the longitudinal axis of the heat pipe for a known displacement. Then the time necessary, for a given fluid to initially assume or return to the configuration required for proper operation was calculated. In addition to providing an estimate of the required priming time, the model predicted that priming could be prematurely terminated. Comparisons of the predicted priming time and priming limitations were made with the results of an experimental test package flown on the NASA KC-135 Zero-g aircraft. The...
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