Non-dimensional parameters controlling the behaviour of oscillaltory flows around stacks of parallel plates in thermoacoustic devices

Xiaoan Mao, Lei Shi, Artur J. Jaworski

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

1 Citation (Scopus)

Abstract

In thermoacoustic engines and coolers, a compressible fluid undergoes an oscillatory motion around a solid body to facilitate an energy transfer between heat and acoustic waves. The solid body often takes a form of a stack of parallel plates. The oscillatory flow leads to interesting vortex shedding processes at the end of stack, which impacts the performance of the thermoacoustic device due to possible modification of heat transfer processes. There have been many works, experimental and numerical, dedicated to studies of the fluid flow around stacks, both for dimensions representative for realistic devices and using scaled-up arrangements, to obtain a better insight into the flow processes. Depending on the plate thickness, plate spacing and the fluid displacement amplitude, a series of distinct vortex shedding flow patterns are identified. These are either related to a breakup of thin elongated shear layers, or von Karman-like shedding (typical for bluff bodies in steady flows). However, the broad parameter space and the flow physics, which is still not very well understood, make the comparisons between various configurations and flow conditions difficult. Subsequently it is difficult to devise appropriate criteria for the design of stacks. The present work is an effort to find a unified approach to studying the oscillatory flow phenomena around stacks. Firstly, the Navier-Stokes equation is normalized for this particular type of flow, and a group of potential controlling parameters is identified. Secondly, based on the data available from existing literature and our own experiments, the complex phenomena of the oscillatory flow around a stack are discussed in some detail using the likely non-dimensional controlling parameters. Conclusions and suggestions for future work are drawn.

LanguageEnglish
Title of host publication16th International Congress on Sound and Vibration 2009, ICSV 2009
Pages1885-1892
Number of pages8
Volume3
Publication statusPublished - 1 Dec 2009
Externally publishedYes
Event16th International Congress on Sound and Vibration - Krakow, Poland
Duration: 5 Jul 20099 Jul 2009
http://www.wikicfp.com/cfp/servlet/event.showcfp?eventid=4380&copyownerid=2 (Link to Conference Information)

Conference

Conference16th International Congress on Sound and Vibration
Abbreviated titleICSV 2009
CountryPoland
CityKrakow
Period5/07/099/07/09
Internet address

Fingerprint

parallel plates
vortex shedding
bluff bodies
compressible fluids
steady flow
shear layers
coolers
Navier-Stokes equation
fluid flow
suggestion
engines
flow distribution
heat transfer
energy transfer
spacing
heat
physics
acoustics
fluids
configurations

Cite this

Mao, X., Shi, L., & Jaworski, A. J. (2009). Non-dimensional parameters controlling the behaviour of oscillaltory flows around stacks of parallel plates in thermoacoustic devices. In 16th International Congress on Sound and Vibration 2009, ICSV 2009 (Vol. 3, pp. 1885-1892)
Mao, Xiaoan ; Shi, Lei ; Jaworski, Artur J. / Non-dimensional parameters controlling the behaviour of oscillaltory flows around stacks of parallel plates in thermoacoustic devices. 16th International Congress on Sound and Vibration 2009, ICSV 2009. Vol. 3 2009. pp. 1885-1892
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abstract = "In thermoacoustic engines and coolers, a compressible fluid undergoes an oscillatory motion around a solid body to facilitate an energy transfer between heat and acoustic waves. The solid body often takes a form of a stack of parallel plates. The oscillatory flow leads to interesting vortex shedding processes at the end of stack, which impacts the performance of the thermoacoustic device due to possible modification of heat transfer processes. There have been many works, experimental and numerical, dedicated to studies of the fluid flow around stacks, both for dimensions representative for realistic devices and using scaled-up arrangements, to obtain a better insight into the flow processes. Depending on the plate thickness, plate spacing and the fluid displacement amplitude, a series of distinct vortex shedding flow patterns are identified. These are either related to a breakup of thin elongated shear layers, or von Karman-like shedding (typical for bluff bodies in steady flows). However, the broad parameter space and the flow physics, which is still not very well understood, make the comparisons between various configurations and flow conditions difficult. Subsequently it is difficult to devise appropriate criteria for the design of stacks. The present work is an effort to find a unified approach to studying the oscillatory flow phenomena around stacks. Firstly, the Navier-Stokes equation is normalized for this particular type of flow, and a group of potential controlling parameters is identified. Secondly, based on the data available from existing literature and our own experiments, the complex phenomena of the oscillatory flow around a stack are discussed in some detail using the likely non-dimensional controlling parameters. Conclusions and suggestions for future work are drawn.",
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Mao, X, Shi, L & Jaworski, AJ 2009, Non-dimensional parameters controlling the behaviour of oscillaltory flows around stacks of parallel plates in thermoacoustic devices. in 16th International Congress on Sound and Vibration 2009, ICSV 2009. vol. 3, pp. 1885-1892, 16th International Congress on Sound and Vibration , Krakow, Poland, 5/07/09.

Non-dimensional parameters controlling the behaviour of oscillaltory flows around stacks of parallel plates in thermoacoustic devices. / Mao, Xiaoan; Shi, Lei; Jaworski, Artur J.

16th International Congress on Sound and Vibration 2009, ICSV 2009. Vol. 3 2009. p. 1885-1892.

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

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Y1 - 2009/12/1

N2 - In thermoacoustic engines and coolers, a compressible fluid undergoes an oscillatory motion around a solid body to facilitate an energy transfer between heat and acoustic waves. The solid body often takes a form of a stack of parallel plates. The oscillatory flow leads to interesting vortex shedding processes at the end of stack, which impacts the performance of the thermoacoustic device due to possible modification of heat transfer processes. There have been many works, experimental and numerical, dedicated to studies of the fluid flow around stacks, both for dimensions representative for realistic devices and using scaled-up arrangements, to obtain a better insight into the flow processes. Depending on the plate thickness, plate spacing and the fluid displacement amplitude, a series of distinct vortex shedding flow patterns are identified. These are either related to a breakup of thin elongated shear layers, or von Karman-like shedding (typical for bluff bodies in steady flows). However, the broad parameter space and the flow physics, which is still not very well understood, make the comparisons between various configurations and flow conditions difficult. Subsequently it is difficult to devise appropriate criteria for the design of stacks. The present work is an effort to find a unified approach to studying the oscillatory flow phenomena around stacks. Firstly, the Navier-Stokes equation is normalized for this particular type of flow, and a group of potential controlling parameters is identified. Secondly, based on the data available from existing literature and our own experiments, the complex phenomena of the oscillatory flow around a stack are discussed in some detail using the likely non-dimensional controlling parameters. Conclusions and suggestions for future work are drawn.

AB - In thermoacoustic engines and coolers, a compressible fluid undergoes an oscillatory motion around a solid body to facilitate an energy transfer between heat and acoustic waves. The solid body often takes a form of a stack of parallel plates. The oscillatory flow leads to interesting vortex shedding processes at the end of stack, which impacts the performance of the thermoacoustic device due to possible modification of heat transfer processes. There have been many works, experimental and numerical, dedicated to studies of the fluid flow around stacks, both for dimensions representative for realistic devices and using scaled-up arrangements, to obtain a better insight into the flow processes. Depending on the plate thickness, plate spacing and the fluid displacement amplitude, a series of distinct vortex shedding flow patterns are identified. These are either related to a breakup of thin elongated shear layers, or von Karman-like shedding (typical for bluff bodies in steady flows). However, the broad parameter space and the flow physics, which is still not very well understood, make the comparisons between various configurations and flow conditions difficult. Subsequently it is difficult to devise appropriate criteria for the design of stacks. The present work is an effort to find a unified approach to studying the oscillatory flow phenomena around stacks. Firstly, the Navier-Stokes equation is normalized for this particular type of flow, and a group of potential controlling parameters is identified. Secondly, based on the data available from existing literature and our own experiments, the complex phenomena of the oscillatory flow around a stack are discussed in some detail using the likely non-dimensional controlling parameters. Conclusions and suggestions for future work are drawn.

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M3 - Conference contribution

SN - 9781615677368

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EP - 1892

BT - 16th International Congress on Sound and Vibration 2009, ICSV 2009

ER -

Mao X, Shi L, Jaworski AJ. Non-dimensional parameters controlling the behaviour of oscillaltory flows around stacks of parallel plates in thermoacoustic devices. In 16th International Congress on Sound and Vibration 2009, ICSV 2009. Vol. 3. 2009. p. 1885-1892