CFD-simulation of oscillatory flow around the heat exchangers of thermoacoustic devices

Olusegun M. Ilori, Xiaoan Mao, Artur J. Jaworski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Thermoacoustic systems rely on conversion between thermal and acoustic (i.e. mechanical) forms of energy. The technology lends itself to various applications such as waste heat recovery to produce useful electricity or cooling power or gas liquefaction and regasification in oil and gas industry. Detailed understanding of the fluid flow processes within the internal structures of thermoacoustic systems, especially the heat exchangers, is seen as one of the ways by which the performance of next generation of thermoacoustic systems can be improved. The current study uses 2-D computational fluid dynamics (CFD) model to perform numerical investigations of thermoacoustic heat exchangers placed in an oscillatory flow induced by a standing wave. The computational domain is chosen from a thermoacoustic rig that is built for characterisation of heat exchangers for thermoacoustic applications. Validation of the present numerical approach is first established. Then the numerical analysis is extended by modifying the geometrical and operating parameters. The geometrical parameter considered is the curvature radius of the aerodynamic shapes attached to the entrance and exit of gas channels of the heat exchangers, mainly to modify the flow characteristics. Cases are run for the drive ratios (i.e. the ratio of maximum pressure amplitude to the mean pressure) ranging from 0.3-3.0 Turbulent model as suitable for thermoacoustic analysis is selected from the literature. Results are discussed based on velocity profiles and the pressure difference obtained as functions of phase angles in the acoustic flow cycle.
LanguageEnglish
Title of host publicationProceedings of ASME 2014 International Mechanical Engineering Congress and Exposition
Subtitle of host publicationMontreal, Quebec, Canada, November 14–20
PublisherAmerican Society of Mechanical Engineers (ASME)
Number of pages8
ISBN (Electronic)978-0-7918-4954-5
DOIs
Publication statusPublished - 14 Nov 2014
Externally publishedYes

Fingerprint

Thermoacoustics
Heat exchangers
Computational fluid dynamics
Computer simulation
Acoustics
Liquefaction of gases
Gas industry
Waste heat utilization
Numerical analysis
Flow of fluids
Dynamic models
Aerodynamics
Electricity
Cooling
Gases

Cite this

Ilori, O. M., Mao, X., & Jaworski, A. J. (2014). CFD-simulation of oscillatory flow around the heat exchangers of thermoacoustic devices. In Proceedings of ASME 2014 International Mechanical Engineering Congress and Exposition: Montreal, Quebec, Canada, November 14–20 [IMECE2014-37926] American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/IMECE2014-37926
Ilori, Olusegun M. ; Mao, Xiaoan ; Jaworski, Artur J. / CFD-simulation of oscillatory flow around the heat exchangers of thermoacoustic devices. Proceedings of ASME 2014 International Mechanical Engineering Congress and Exposition: Montreal, Quebec, Canada, November 14–20. American Society of Mechanical Engineers (ASME), 2014.
@inproceedings{86ba3dafa25840e0ac3ecbc1f1ad7970,
title = "CFD-simulation of oscillatory flow around the heat exchangers of thermoacoustic devices",
abstract = "Thermoacoustic systems rely on conversion between thermal and acoustic (i.e. mechanical) forms of energy. The technology lends itself to various applications such as waste heat recovery to produce useful electricity or cooling power or gas liquefaction and regasification in oil and gas industry. Detailed understanding of the fluid flow processes within the internal structures of thermoacoustic systems, especially the heat exchangers, is seen as one of the ways by which the performance of next generation of thermoacoustic systems can be improved. The current study uses 2-D computational fluid dynamics (CFD) model to perform numerical investigations of thermoacoustic heat exchangers placed in an oscillatory flow induced by a standing wave. The computational domain is chosen from a thermoacoustic rig that is built for characterisation of heat exchangers for thermoacoustic applications. Validation of the present numerical approach is first established. Then the numerical analysis is extended by modifying the geometrical and operating parameters. The geometrical parameter considered is the curvature radius of the aerodynamic shapes attached to the entrance and exit of gas channels of the heat exchangers, mainly to modify the flow characteristics. Cases are run for the drive ratios (i.e. the ratio of maximum pressure amplitude to the mean pressure) ranging from 0.3-3.0 Turbulent model as suitable for thermoacoustic analysis is selected from the literature. Results are discussed based on velocity profiles and the pressure difference obtained as functions of phase angles in the acoustic flow cycle.",
author = "Ilori, {Olusegun M.} and Xiaoan Mao and Jaworski, {Artur J.}",
year = "2014",
month = "11",
day = "14",
doi = "10.1115/IMECE2014-37926",
language = "English",
booktitle = "Proceedings of ASME 2014 International Mechanical Engineering Congress and Exposition",
publisher = "American Society of Mechanical Engineers (ASME)",
address = "United States",

}

Ilori, OM, Mao, X & Jaworski, AJ 2014, CFD-simulation of oscillatory flow around the heat exchangers of thermoacoustic devices. in Proceedings of ASME 2014 International Mechanical Engineering Congress and Exposition: Montreal, Quebec, Canada, November 14–20., IMECE2014-37926, American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/IMECE2014-37926

CFD-simulation of oscillatory flow around the heat exchangers of thermoacoustic devices. / Ilori, Olusegun M.; Mao, Xiaoan; Jaworski, Artur J.

Proceedings of ASME 2014 International Mechanical Engineering Congress and Exposition: Montreal, Quebec, Canada, November 14–20. American Society of Mechanical Engineers (ASME), 2014. IMECE2014-37926.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - CFD-simulation of oscillatory flow around the heat exchangers of thermoacoustic devices

AU - Ilori, Olusegun M.

AU - Mao, Xiaoan

AU - Jaworski, Artur J.

PY - 2014/11/14

Y1 - 2014/11/14

N2 - Thermoacoustic systems rely on conversion between thermal and acoustic (i.e. mechanical) forms of energy. The technology lends itself to various applications such as waste heat recovery to produce useful electricity or cooling power or gas liquefaction and regasification in oil and gas industry. Detailed understanding of the fluid flow processes within the internal structures of thermoacoustic systems, especially the heat exchangers, is seen as one of the ways by which the performance of next generation of thermoacoustic systems can be improved. The current study uses 2-D computational fluid dynamics (CFD) model to perform numerical investigations of thermoacoustic heat exchangers placed in an oscillatory flow induced by a standing wave. The computational domain is chosen from a thermoacoustic rig that is built for characterisation of heat exchangers for thermoacoustic applications. Validation of the present numerical approach is first established. Then the numerical analysis is extended by modifying the geometrical and operating parameters. The geometrical parameter considered is the curvature radius of the aerodynamic shapes attached to the entrance and exit of gas channels of the heat exchangers, mainly to modify the flow characteristics. Cases are run for the drive ratios (i.e. the ratio of maximum pressure amplitude to the mean pressure) ranging from 0.3-3.0 Turbulent model as suitable for thermoacoustic analysis is selected from the literature. Results are discussed based on velocity profiles and the pressure difference obtained as functions of phase angles in the acoustic flow cycle.

AB - Thermoacoustic systems rely on conversion between thermal and acoustic (i.e. mechanical) forms of energy. The technology lends itself to various applications such as waste heat recovery to produce useful electricity or cooling power or gas liquefaction and regasification in oil and gas industry. Detailed understanding of the fluid flow processes within the internal structures of thermoacoustic systems, especially the heat exchangers, is seen as one of the ways by which the performance of next generation of thermoacoustic systems can be improved. The current study uses 2-D computational fluid dynamics (CFD) model to perform numerical investigations of thermoacoustic heat exchangers placed in an oscillatory flow induced by a standing wave. The computational domain is chosen from a thermoacoustic rig that is built for characterisation of heat exchangers for thermoacoustic applications. Validation of the present numerical approach is first established. Then the numerical analysis is extended by modifying the geometrical and operating parameters. The geometrical parameter considered is the curvature radius of the aerodynamic shapes attached to the entrance and exit of gas channels of the heat exchangers, mainly to modify the flow characteristics. Cases are run for the drive ratios (i.e. the ratio of maximum pressure amplitude to the mean pressure) ranging from 0.3-3.0 Turbulent model as suitable for thermoacoustic analysis is selected from the literature. Results are discussed based on velocity profiles and the pressure difference obtained as functions of phase angles in the acoustic flow cycle.

U2 - 10.1115/IMECE2014-37926

DO - 10.1115/IMECE2014-37926

M3 - Conference contribution

BT - Proceedings of ASME 2014 International Mechanical Engineering Congress and Exposition

PB - American Society of Mechanical Engineers (ASME)

ER -

Ilori OM, Mao X, Jaworski AJ. CFD-simulation of oscillatory flow around the heat exchangers of thermoacoustic devices. In Proceedings of ASME 2014 International Mechanical Engineering Congress and Exposition: Montreal, Quebec, Canada, November 14–20. American Society of Mechanical Engineers (ASME). 2014. IMECE2014-37926 https://doi.org/10.1115/IMECE2014-37926