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Cool-down studies on vacuum insulated cryogenic transfer lines

✍ Scribed by M.V. Krishna Murthy; S. Srinivasa Murthy; K. Srinivasan; M. Kanniah

Publisher: Elsevier Science
Year: 1976
Tongue: English
Weight: 300 KB
Volume: 16
Category: Article
ISSN: 0011-2275
DOI: 10.1016/0011-2275(76)90053-9

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✦ Synopsis

Analytical and experimental studies on the cool-down of vacuum insulated cryogenic transfer lines have been carried out. An expression for estimating the cool-down history is derived taking into account the gas conduction effects. Experiments were carried out for LN2 flow in glass lines. The cool-down time decreases with increasing vacuum up to 10 -2 torr. Beyond this there is no significant change in cool-down time. The outer jacket size has no appreciable influence on the cool-down process. Higher mass flow rates result in faster cooling of the pipe line. The experimental and theoretical cool-down curves agree well, particularly at higher jacket vacuums and at higher mass flow rates.

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