Investigation of the effect of a bend in a transfer line that separates a pulse tube cold head and a pressure wave generator

A. A. Dev, M. D. Atrey, S. Vanapalli

Research output: Contribution to journalConference article

Abstract

A transfer line between a pulse tube cold head and a pressure wave generator is usually required to isolate the cold head from the vibrations of the compressor. Although it is a common practice to use a thin and narrow straight tube, a bent tube would allow design flexibility and easy mounting of the cold head, such as in a split Stirling type pulse tube cryocooler. In this paper, we report a preliminary investigation on the effect of the bending of the tube on the flow transfer characteristics. A numerical study using commercial computational fluid dynamics model is performed to gain insight into the flow characteristics in the bent tube. Oscillating flow experiments are performed with a straight and a bent tube at a filling pressure of 15 bar and an operating frequency of 40, 50 and 60 Hz. The data and the corresponding numerical simulations point to the hypothesis that the secondary flow in the bent tube causes a decrease in flow at a fixed pressure amplitude.

Original languageEnglish
Article number012065
JournalIOP Conference Series: Materials Science and Engineering
Volume171
Issue number1
DOIs
StatePublished - Mar 1 2017
Event26th International Cryogenic Engineering Conference, ICEC 2016 and International Cryogenic Materials Conference 2016, ICMC 2016 - New Delhi, India
Duration: Mar 7 2016Mar 11 2016

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