Numerical Analysis of Heat Pumping in Oscillatory Flows(Thermal Engineering)

Abstract

A numerical analysis has been performed to clarify how heat pumping in a regenerator is generated in oscillatory flows and to investigate the effect of heat pumping on the phase difference between pressure and velocity. Pulse tube refrigerators of the 1st and 2nd generations are used as physical models in this study. In the 1st generation, the phase difference between pressure and velocity is nearly 90° and in the 2nd generation, nearly 0°. Transient one-dimensional equations of continuity, momentum and energy are solved utilizing a TVD scheme. It was found that heat pumping in a regenerator is shown by analyzing the fields of velocity and temperature of gas elements without thermoacoustic theory. It was also found that heat pumping in a regenerator is enhanced when the phase difference between pressure and velocity is nearly 0°.