Poster De Conférence Année : 2024

Performance Improvement of Low Pressure Inertance Pulse tube Cryocooler

Résumé

Miniaturized Pulse tube Cryocoolers integrated with knudsen pump are designed for operations under minimal vibration and low thermal noise where piston movement replaced by rarefied movement of gas molecules within small channels. This phenomenon was limited to operating under low-pressure environment. To develop such a PT cryocooler, numerical studies have shown their importance in predicting the influential parameters on flow inside the pulse tube. The main objective of this work is to use CFD methods to examine the cooling performance at low charging pressure and optimize the design parameters of miniaturized PT cryocoolers. The operating pressure range has been set to 2 bar and the pressure amplitude between 1 and 2 bar. The numerical studies were performed using two-dimensional axisymmetric analysis of an IPTCC with the help of the commercial CFD tool ANSYS FLUENT. As a fundamental case, the geometrical set-up investigated by Ashwin et al [1] is considered. After achieving periodic steady state, numerical results have been compared. The numerical studies at low pressure have shown that cooling performance can be improved by increasing the pressure ratio. Afterwards, the recirculation flow pattern observed near the cold end of the pulse tube due to the scaleing of individual part components of the inertance pulse tube cryocooler(IPTCC). The aspect ratio (length to diameter ratio) of part components had kept similar. This recirculation zone increases the flow velocity near the cold end and reduces the cooling performance. At a high average pressure of 25 bar, this recirculation zones appeared near the wall and circulated the flow between hot and the cold side of the pulse tube. In this study, the design parameters have been carefully modified to reduce recirculation zones.

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Dates et versions

hal-04943852 , version 1 (24-02-2025)

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Identifiants

  • HAL Id : hal-04943852 , version 1

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Maimuna Rafique, Lucien Baldas, Jan Korvink, Juergen J. Brandner. Performance Improvement of Low Pressure Inertance Pulse tube Cryocooler. 29th International Cryogenic Engineering Conference, International Cryogenic Materials Conference 2024, Jul 2024, Genève, Switzerland. ⟨hal-04943852⟩
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