This paper extends the development of re-entrant groove technology to hydrogen heat pipes. Parametric analyses are presented which optimize the theoretical design while considering the limitations of state-of-the-art extrusion technology. Acceptable production-type runs of extruded lengths (over 300 meters) could only be achieved at the expense of a wider nominal groove opening than specified (0.33 mm vs 0.20 mm). However, dimensional variations of other critical dimensions were within 0.05 mm, which exceeded expectations. The 6063-T6 aluminium extrusion is 14.6 mm OD with a wall thickness of 1.66 mm and contains 20 axial grooves which surround a central 9.3 mm diameter vapor core. Each axial groove is 0.775 mm diameter with a 0.33 mm opening. An excess vapor reservoir is provited at the evaporator to minimize the pressure containment hazard during ambient storag. Details of the instrumentation and helium cooled test installation are also presented. Meeting the manuscript deadline precluded including test results but these will be presented at the technical session of the 3rd International Heat Pipe Conference.
A re-entrant groove hydrogen heat pipe
Ein wasserstoffgekuehltes Temperaturuebertragungsrohr mit Laengsnuten mit einspringenden Seitentflaechen
3RD INTERNAT. HEAT PIPE CONF., AIAA ; 194-202
1978
9 Seiten, 11 Bilder, 2 Tabellen, 7 Quellen
Conference paper
English
A re-entrant groove hydrogen heat pipe
AIAA | 1978
|AIAA | 1978
|AIAA | 1977
|Reentrant-Groove Hydrogen Heat Pipe
NTRS | 1982
|Novel Groove-Shaped Screen-Wick Miniature Heat Pipe
AIAA | 2002
|