TED-AJ03-164 NUMERICAL ANALYSIS OF HEAT AND FLUID FLOW IN PULSE TUBE REFRIGERATOR

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Numerical study has been performed on heat and fluid flow in basic pulse tube refrigerator to analyze the working principle. There is a mechanism called "surface heat pumping" as one of the working principles of refrigeration for the basic pulse tube refrigerator of the first generation. This is the mechanism that heat is pumped from the cold end to the hot end by the successive heat exchanges between the pulse tube wall and the working gas in the tube. A numerical simulation of viscous compressible flow in the basic pulse tube refrigerator has been performed to make clear the working principle of refrigeration. Transient axisymmetric two-dimensional equations of continuity, momentum and energy were solved by means of TVD method. The physical model of the pulse tube with a regenerator is used for numerical simulation. The pulse tube is a stainless steel pipe of 150mm in length, 5mm in inner diameter and 1mm in thickness, containing the heat exchanger of 30mm in length. The dimensions of regenerator are 60mm in length and 12.5mm in inner diameter. The woven 200 mesh wire screens of copper are used as a regenerator material. The air is selected as a working gas. Heat exchanges between the pulse tube wall and the working gas in the tube are assumed as a convective heat transfer. The oscillating flow is generated by changing the pressure at the inlet of regenerator with time as a sinusoidal wave. In this paper analyzed are the transient behaviors of pressure and gas temperature, heat transfer from the working gas to the tube wall, and moving distances and temperature changes of gas elements in the pulse tube.[figure]
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TED-AJ03-164 NUMERICAL ANALYSIS OF HEAT AND FLUID FLOW IN PULSE TUBE REFRIGERATOR

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