Abstract
This chapter explores the effectiveness of using an additional DC flow to reduce convective heat losses in inclined pulse tube refrigerators. The effectiveness of using an additional DC flow to improve the cooling performance by reducing convective heat losses caused by gravity-driven secondary flow in inclined orifice pulse tube refrigerators is studied by visualization of flow and by measurement of gas temperatures at the cold and hot ends of the pulse tube. Results reveal that the gas temperature decreases at the cold end and increases at the hot end by decreasing the convective secondary flow to an optimum level in the core region generated by the additional DC flow, and that the gas temperature increases at the cold end and decreases at the hot end when the additional DC flow exceeds this level. These results confirm that convective heat loss can be effectively reduced by using an additional DC flow, if the level of the flow is optimized, and that the cooling performance of the refrigerator can thereby be improved.
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