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CFD analysis of high frequency miniature pulse tube refrigerators for space applications with thermal non-equilibrium model
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Rajan, Ashwin T., Narasimham, G. S. V. L. and Jacob, Subhash (2010) CFD analysis of high frequency miniature pulse tube refrigerators for space applications with thermal non-equilibrium model. Applied Thermal Engineering, 30 (2-3). pp. 152-166. doi:10.1016/j.applthermaleng.2009.07.015
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WRAP_1371532-wmg-050916-cfd_analysis_of_high_frequency_miniature_pulse_tube_refrigerators_for.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (1755Kb) |
Official URL: http://dx.doi.org/10.1016/j.applthermaleng.2009.07...
Abstract
High frequency, miniature, pulse tube cryocoolers are extensively used in space applications because of their simplicity. Parametric studies of inertance type pulse tube cooler are performed with different length-to-diameter ratios of the pulse tube with the help of the FLUENT® package. The local thermal non-equilibrium of the gas and the matrix is taken into account for the modeling of porous zones, in addition to the wall thickness of the components. Dynamic characteristics and the actual mechanism of energy transfer in pulse are examined with the help of the pulse tube wall time constant. The heat interaction between pulse tube wall and the oscillating gas, leading to surface heat pumping, is quantified. The axial heat conduction is found to reduce the performance of the pulse tube refrigerator. The thermal non-equilibrium predicts a higher cold heat exchanger temperature compared to thermal equilibrium. The pressure drop through the porous medium has a strong non-linear effect due to the dominating influence of Forchheimer term over that of the linear Darcy term at high operating frequencies. The phase angle relationships among the pressure, temperature and the mass flow rate in the porous zones are also important in determining the performance of pulse tube refrigerator.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QC Physics T Technology > TP Chemical technology |
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| Divisions: | Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
| Library of Congress Subject Headings (LCSH): | Refrigeration and refrigerating machinery, Thermodynamic equilibrium, Computational fluid dynamics | ||||||||
| Journal or Publication Title: | Applied Thermal Engineering | ||||||||
| Publisher: | Pergamon | ||||||||
| ISSN: | 1359-4311 | ||||||||
| Official Date: | 2010 | ||||||||
| Dates: |
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| Volume: | 30 | ||||||||
| Number: | 2-3 | ||||||||
| Page Range: | pp. 152-166 | ||||||||
| DOI: | 10.1016/j.applthermaleng.2009.07.015 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access |
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