Abstract An experimental apparatus has been developed to investigate the thermal and hydrodynamic characteristics of regenerators. Instantaneous gas temperature, pulsating pressure and mass flow rate have been measured at both ends of the regenerator. First, pressure drop characteristics were investigated by comparing numerical simulations with experimental data. When the frequency was 4.6 Hz, the time variation of the pressure drop was predicted quite well by calculations based on conventional steady-flow friction factors. At 60 Hz operation, the amplitude of pressure drop was underestimated when the mass flow rate became high. Unlike the amplitude of the pressure drop, the phase angle was poorly predicted by the steady-flow friction factor at both 4.6 Hz and 60 Hz. Second, the ineffectiveness of the regenerator was obtained from the experimental data for various cold-end temperatures. For low cold-end temperatures the ineffectiveness of the regenerator increased. The main reason for this increase appears to be a decrease in the interstitial heat transfer coefficient caused by the reduced thermal conductivity of the gas at low temperatures.
Regenerator Characterization under Oscillating Flow and Pulsating Pressure
Cryocoolers 12 ; 531-537
2003-01-01
7 pages
Article/Chapter (Book)
Electronic Resource
English
Regenerator Characterization under Oscillating Flow and Pulsating Pressure
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