Numerical Simulation of the Heat Transfer and Flow Characteristics of Pulse Tube Refrigerators
Author:
Meng Yuan1,
Cui Zheng2,
Shao Wei12,
Ji Wanxiang1
Affiliation:
1. Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China
2. Shandong Institute of Advanced Technology, Jinan 250061, China
Abstract
Because of the unequal diameter between the pulse tube and the heat exchangers at the two sides, the fluid entering the pulse tube from the heat exchanger easily forms a complex disturbing flow in the pulse tube, which causes energy loss and affects the performance of a pulse tube refrigerator. This study proposes a numerical model for predicting the flow and heat transfer characteristics of pulse tube refrigerators. Three cases of adding conical tube transitions between the pulse tube and the heat exchanger are studied, and the results indicate that the conical tube transition can reduce the fluid flow velocity at the inlet and outlet of the pulse tube and reduce the size of the vortex at the boundary of the pulse tube. In comparison with the tapered transition of 45° on only one side of the pulse tube, both sides can maintain the temperature gradient, effectively decrease the effect of the disturbing flow, and significantly improve the cooling performance of the pulse tube.
Funder
Taishan Scholar Project,Natural Science Foundation of Shandong Province,China Postdoctoral Science Foundation
Subject
Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction
Reference27 articles.
1. Bian, S. (1983). Small Cryogenic Refrigerator, Mechanical Industry Press.
2. Pulse tube refrigeration;Gifford;J. Eng. Ind.-Trans. ASME,1964
3. Longsworth, R.C. (1967). Advances in Cryogenic Engineering, Springer.
4. Low temperature expansion pulse tubes;Mikulin;Adv. Cryog. Eng.,1984
5. A comparison of three types of pulse tube refrigerators: New methods for reaching 60 K;Radebaugh;Adv. Cryog. Eng.,1986