Pulse Tube Refrigerator Based on Fluid Inertia
Refrigeration effect in pulse tube coolers can be explained/understood in terms of phase shift between oscillations of pressure and displacement of gas particle at the cold end of the pulse tube. There are different mechanisms (means) to create the phase shift. Surface heat pumping and resistance to fluid flow in orifice are two examples of commonly used mechanisms to create needed phase shifts in basic pulse tube cooler and orifice pulse tube cooler respectively. At high frequency operation there is yet another mechanism possible due to fluid inertia that could effectively be used to create favorable phase shift. Results of experimental investigations of the new mechanism are presented. It is found in the case double inlet pulse tube cooler that effectiveness of second (double) inlet progressively diminished as operating frequency increased. It is also observed as the operating frequency increased that fluid inertia based phase shifter achieved lower temperatures than simple orifice and double inlet configurations in a certain frequency range.
KeywordsPressure Ratio Pulse Tube Refrigeration Temperature Fluid Inertia Refrigeration Capacity
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