Experimental study of the oscillating flow characteristics for a regenerator in a pulse tube cryocooler

✍ Scribed by Yonglin Ju; Yan Jiang; Yuan Zhou

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 236 KB
• Volume: 38
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/s0011-2275(98)00037-x

✦ Synopsis

A dynamic experimental apparatus was designed and constructed to investigate oscillating flow characteristics in a regenerator subjected to a periodically reversing flow established by means of a self-made linear compressor. Detailed experimental data of oscillating pressure drops and phase shift characteristics for regenerators in a high frequency pulse tube cryocooler with an operating frequency of 50 Hz were given. The correlation equations for the maximum and cycle-averaged friction factors in terms of Reynolds numbers and dimensionless distance X were obtained. It was found that the value of the cycle-averaged pressure drop in the oscillating flow across the regenerator is two to three times higher than that of a steady flow at the same Reynolds numbers based on the cross-sectional mean velocity. In addition, the relationship of the phase shifts between the velocity and pressure wave is also discussed.