Numerical analysis on pressure drop and heat transfer performance of mesh regenerators used in cryocoolers

Tao, Yu; Liu, Y.W.; Gao, Fengjie; Chen, X.Y.; He, Ya‐Ling

doi:10.1016/j.cryogenics.2009.07.003

Cited by 27 publications

(9 citation statements)

References 13 publications

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“…The Forchheimer inertial coefficient was dependent of the pulsating frequency of the flow. Based on experimental results, an anisotropic equation was derived from calculating the permeability and the inertial coefficient for a wire screen mesh regenerator by Tao et al [10]. A computational study was performed by Teitel [11] to simulate the flow through a woven screen mesh using available correlation data, and the permeability and inertial coefficient were obtained from the wind tunnel testing of Miguel [12], and the obtained numerical results were validated well with the experimental data.…”

Section: Introductionmentioning

confidence: 95%

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Correlations Based on Numerical Validation of Oscillating Flow Regenerator

et al. 2022

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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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Section: Introductionmentioning

confidence: 95%

“…Equation (10) shows the relation between pressure drop and resistances based on the Ergun semiempirical correlation.…”

Section: Friction Factor Characteristicsmentioning

confidence: 99%

Correlations Based on Numerical Validation of Oscillating Flow Regenerator

et al. 2022

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“…Clearman et al [14] experimented several types of annular porous matrices to confirm the importance of the anisotropy and the average pressure in such structures. Recently, Tao et al [15] studied numerically heat transfer in regenerator for different mesh types, materials and lengths of the porous layer. They were able to determine the anisotropic characteristics of a porous medium as regenerator in a cryogenic cooling system (PTR).…”

Section: Introductionmentioning

confidence: 99%

Numerical characterization of a γ-Stirling engine considering losses and interaction between functioning parameters

Hachem

Gheith²,

Aloui³

et al. 2015

Energy Conversion and Management

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“…Landrum et al [20] followed the same CFD procedure in establishing the hydrodynamic properties of the regenerator in an oscillating flow but with small mesh fillers suitable for miniature cryocoolers. In a different study, the porous medium coefficients were also derived by Tao et al [21]. However, the derived equation is inappropriate for general use as the friction factor applied in defining the pressure drop is the equation specifically built for cryogenic conditions.…”

Section: Literature Reviewmentioning

confidence: 99%

Friction Factor Correlation for Regenerator Working in a Travelling-Wave Thermoacoustic System

Saat

Jaworski

2017

Applied Sciences

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Abstract:Regenerator is a porous solid structure which is important in the travelling-wave thermoacoustic system. It provides the necessary contact surface and thermal capacity for the working gas to undergo a thermodynamic cycle under acoustic oscillatory flow conditions. However, it also creates a pressure drop that could degrade the overall system performance. Ideally, in a travelling-wave system, the phase angle between oscillating pressure and velocity in the regenerator should be zero, or as close to zero as possible. In this study, the hydrodynamic condition of a regenerator has been investigated both experimentally (in a purpose-built rig providing a travelling-wave phasing) and numerically. A two-dimensional ANSYS FLUENT CFD model, capturing the important features of the experimental conditions, has been developed. The findings suggest that a steady-state correlation, commonly used in designing thermoacoustic systems, is applicable provided that the travelling-wave phase angle is maintained. However, for coarse mesh regenerators, the results show interesting "phase shifting" phenomena, which may limit the correlation validity. Current experimental and CFD studies are important for predicting the viscous losses in future models of thermoacoustic systems.

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Numerical analysis on pressure drop and heat transfer performance of mesh regenerators used in cryocoolers

Cited by 27 publications

References 13 publications

Correlations Based on Numerical Validation of Oscillating Flow Regenerator

Correlations Based on Numerical Validation of Oscillating Flow Regenerator

Numerical characterization of a γ-Stirling engine considering losses and interaction between functioning parameters

Friction Factor Correlation for Regenerator Working in a Travelling-Wave Thermoacoustic System

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