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Numerical Modeling of Pulse Tube Refrigerator and Study of Multi-Dimensional Effect

Jahanbakhshi, Reza | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41124 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saeedi, Mohammad Hassan
  7. Abstract:
  8. Pulse Tube Refrigerator (PTR) has an exceptional feature among all similar refrigerators, because of its unique characteristics such as long lifetime, compact size and no moving parts in low temperature. Despite of all these advantages because of its low efficiency, many researchers are trying to optimize performance of this refrigerator. Most of these efforts are based on one-dimensional simulation of the system. In this thesis, a two-dimensional analysis is performed to study the nature of flow field in an Inertance Tube Pulse Tube Refrigerator (ITPTR). This analysis is based on a numerical modeling of an entire ITPTR. To reach this purpose the two-dimensional form of mass, momentum and energy equation with an axi-symmetric assumption solved by a numerical code develoved in MATLAB software. For verifying the simulation a pulse tube refrigerator prototype has been designed, fabricated and tested in our laboratory. In this simulation the modeled system is studied in different operational and geometrical conditions to achieve an optimum performance. In favor of this purpose the effect of some key parameters on the performance of ITPTR are studied. These parameters include mesh size in regenerator, pulse tube’s diameter and length, regenerator’s diameter and length, length of Inertance tube, operating pressure and pressure amplitude. Also to achieve a phenomenal understanding of oscillatory flow in PTR, the flow pattern in different local and temporal position is studied and its effect on efficiency of system is considered
  9. Keywords:
  10. Finite Volume Method ; Computational Fluid Modeling ; Inertance Tube ; Pulse Tube Refrigrator

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