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

Fatimah A. Z. Mohd Saat, Artur J. Jaworski

Research output: Contribution to journalArticle

6 Citations (Scopus)

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.
Original languageEnglish
Article number253
Number of pages19
JournalApplied Sciences
Volume7
Issue number3
DOIs
Publication statusPublished - 5 Mar 2017
Externally publishedYes

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Thermoacoustics
regenerators
friction factor
Regenerators
traveling waves
Friction
charge flow devices
Computational fluid dynamics
phase shift
thermodynamic cycles
pressure drop
Contacts (fluid mechanics)
Specific heat
Pressure drop
mesh
Hydrodynamics
Gases
Acoustics
hydrodynamics
Thermodynamics

Cite this

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title = "Friction Factor Correlation for Regenerator Working in a Travelling-Wave Thermoacoustic System",
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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author = "{Mohd Saat}, {Fatimah A. Z.} and Jaworski, {Artur J.}",
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journal = "Applied Sciences (Switzerland)",
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Friction Factor Correlation for Regenerator Working in a Travelling-Wave Thermoacoustic System. / Mohd Saat, Fatimah A. Z.; Jaworski, Artur J.

In: Applied Sciences, Vol. 7, No. 3, 253, 05.03.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Friction Factor Correlation for Regenerator Working in a Travelling-Wave Thermoacoustic System

AU - Mohd Saat, Fatimah A. Z.

AU - Jaworski, Artur J.

PY - 2017/3/5

Y1 - 2017/3/5

N2 - 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.

AB - 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.

KW - Thermoacoustic system

KW - Acoustic travelling-wave

KW - Porous medium

KW - Regenerator hydrodynamic condition

KW - Phase angle

KW - Flow resistance losses

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DO - 10.3390/app7030253

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