Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Deformation Analysis of Self-regulating Bellows in Joule-Thomson Cryocooler

줄-톰슨 극저온 냉각기용 벨로우즈의 변형해석

  • 이상은 (LIG 넥스원 구미연구원 기술 5팀) ;
  • 이태원 (금오공과대학교 기계공학부)
  • Published : 2008.04.01
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Abstract

Bellows is an important component in Joule-Thomson cryocooler, which minimize the excessive flow of the cryogenic gas. The bellows is made of Monel 400 and its geometry is an axial symmetric shell. During cool-down process, the pressure and volume within bellows must be satisfied with Benedict-Webb-Rubin state equation. Moreover, Poisson's ratio of Monel 400 is nearly constants, but its Young's modulus varies for a drop in temperature. Under these conditions, bellows contracts in the axial direction like a spring. To evaluate deformation of bellows at cryogenic temperature, the numerical calculation of the volume within bellows and finite element analysis are iteratively used in this research. the numerical results show that deformation of the bellows is approximately linear for change of temperature.

Keywords

References

  1. Kim, S. J. and Jang, S. P., "Experimental and Numerical Analysis of Heat Transfer Phenomena in A Sensor Tube of a Mass Flow Controller," International Journal of Heat and Mass Transfer, Vol. 44, No. 9, pp. 1711-1724, 2000 https://doi.org/10.1016/S0017-9310(00)00216-7
  2. Bonney, G. E., "Bi-Material Controlled Demand Flow Joule-thomson coolers," International Cryocooler Conference, pp. 1003-1011, 1993
  3. Lee, W. I., Oh, J. E. and Kim, T. W., "A Study on the Dynamic Characteristics of Bellows," Trans. of the KSME, Vol. 12, No. 6, pp. 1273-1281, 1988
  4. Lee, S. H., Sim, D. S. and Oh, S. G., "A Numerical Analysis Study on Evaluation of the Reliability for Bellows in the Vehicle Exhaust System," J. of KSPSE, Vol. 9, No. 4, pp. 77-82, 2005
  5. Koh, B. K. and Park, K. J., "Development of Element Analysis Program and Simplified Formulas of Bellows and Shape Optimization," Trans. of the KSME A, Vol. 21, No. 8, pp. 1195-1208, 1996
  6. Kim, D. H. and Choi, M. J., "A Vibration Analysis Model for Bellows Using Reduced Degree of Freedom in the Vehicle Exhaust System," Proceeding of KSPE Autumn Conference, pp. 659-663, 1997
  7. Rhee, E. J., Park, M. K. and Joo, D. W., "A Development of Brake System for Inline Skate using Bellows," J. of KSPE, Vol. 16, No. 3, pp. 30-37, 1999
  8. Chien, S. B., Chen, L. T. and Chou, F. C., "A Study on the Transient Characteristics of a Self Regulating Joule-Thomson Cryocooler," Cryogenics, Vol. 36, No. 12, pp. 359-365, 1996 https://doi.org/10.1016/0011-2275(96)81106-4
  9. Chien, S. B. and Chen, L. T., "Two-Phase Coexistence Analysis of the Bellows Control Mechanism for a J-T Cryocooler," Cryogenics, Vol. 39, No. 4, pp. 979-984, 1999
  10. Asami, T. "New Method to Determine the BWR Coefficients in Saturated Region," Cryogenics, Vol. 28, No. 8, pp. 521-526, 1988 https://doi.org/10.1016/0011-2275(88)90164-6
  11. Cengel, Y. A. and Boles, M. A., "Thermodynamics - An Engineering Approach," 4-th Ed., McGraw-Hill, pp. 88-98, 2002
  12. ANSYS, "Online Documentation for ANSYS 10.0," ANSYS Inc., 2005
  13. Special Metals Online Technical Bulletin, "Monel Alloy 400," Special Metals Corporation, http://www.specialmetals.com/documents/Monel20alloy 20400.pdf, 2005
  14. Lopez Cela, J. J., Huerta, C. and Alarcon, E., "Numerical Analysis of Axisymmetric Shell by One-Dimensional Continuum Elements Suitable for High Frequency Excitations," Computers and Structures, Vol. 78, No. 5, pp. 711-724, 2000 https://doi.org/10.1016/S0045-7949(00)00048-1