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http://dx.doi.org/10.3795/KSME-A.2015.39.4.429

Study on Deformation of Miniature Metal Bellows in Cryocooler Following Temperature Change of Internal Gas  

Lee, Seung Ha (EO/IR R&D Lab., LIGNex1 Co., Ltd.)
Lee, Tae Won (Dept. of Mechanical Design Engineering, Kumoh Nat'l Inst. of Technology)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.39, no.4, 2015 , pp. 429-435 More about this Journal
Abstract
A bellows is an important temperature control component in a Joule-Thomson micro-cryocooler. It is designed using a very thin shell, and the inside of the bellows is filled with nitrogen gas. The bellows is made of a nickel-cobalt alloy that maintains its strength and elastic properties in a wide range of temperatures from cryogenic to $300^{\circ}C$. The pressure of the gas and the volume within the bellows vary according to the temperature of the gas. As a result, the bellows contracts or expands in the axial direction like a spring. To explore this phenomenon, the deformation of the bellows and its internal volume must be calculated iteratively under a modified pressure until the state equation of the gas is satisfied at a given temperature. In this paper, the modified Benedict-Webb-Rubin state equation is adopted to describe the temperature-volume-pressure relations of the gas. Experiments were performed to validate the proposed method. The results of a numerical analysis and the experiments showed good agreement.
Keywords
Joule-Thomson Cryocooler; MBWR State Equation; Bellows; Internal Volume; Axisymmetric Shell Element;
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Times Cited By KSCI : 2  (Citation Analysis)
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