Numerical simulation of the viscous compressible flow in a pulse tube is carried out to study the detail of the flow and the fundamental mechanism of refrigeration. Axisymmetric two-dimensional Navier-Stokes equations are solved numerically using a finite-volume method. The analytical solution of oscillating flow in terms of Bessel functions is applied for setting up the velocity profile at the pulse tube inlet as a boundary condition.
The phase difference in oscillating flow between the tube center and the nearby tube wall is observed by the simulation. The temperature separation between the cold end and the hot end, and also the time-averaged enthalpy flow, are evaluated in order to investigate the refrigeration mechanism. The simulation results suggest that the flow of steady refrigeration enthalpy depends also on the profile of the inlet velocity. Moreover, the internal velocity distribution induced by the inlet flow profile might be also an important factor for determining the optimum compressor driving frequency.
Numerical Study of Pulse Tube Flow
Cryocoolers 10 ; Chapter : 38 ; 321-328
2002-01-01
8 pages
Article/Chapter (Book)
Electronic Resource
English
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