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摘要
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Stirling regenerator is one of the emerging heat exchanger systems in the area of cryogenic
cooling. Many kinds of research have been conducted to study the efficiency of Stirling regenerators.
Therefore, the principles and related knowledge of Stirling refrigerators must be thoroughly understood
to design a regenerator with excellent performance for low‐temperature and cryogenic engineering
applications. In this study, an experimental setup is developed to estimate the pressure drop
of the oscillating flow through two different wire‐mesh regenerators, namely, 200 mesh and 300
mesh, for various operating frequencies ranging from 3 (200 RPM) to 10 Hz (600 RPM). Transient,
axisymmetric, incompressible, and laminar flow governing equations are solved numerically, and
source terms are added in the governing equations with the help of the porous media model and
the Ergun semiempirical correlation, assuming that the wire meshes are cylindrical particles arranged
uniformly. Simulation results show that the numerical predictions of temporal pressure variation
are in reasonably good agreement with those of experimental findings. It is also found that
the Ergun correlation works more accurately for higher flow rate conditions. |
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