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

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Dev, A.A.^1 ; Atrey, M.D.^1 ; Vanapalli, S.^1,2

Department of Mechanical Engineering, Indian Institute of Technology Bombay, Mumbai

400076, India^1

University of Twente, P.O.B 217, Enschede

7500 AE, Netherlands^2

关键词: Computational fluid dynamics modeling;    Design flexibility;    Filling pressures;    Flow charac-teristics;    Operating frequency;    Pressure amplitudes;    Pressure wave generators;    Stirling type pulse tube cryocooler;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012065/pdf
DOI  :  10.1088/1757-899X/171/1/012065

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

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.