Oscillating flow in a parallel-plate stack in a standing wave thermoacoustic resonator: PIV measurements within the entrance region

Xiaoan Mao, Zhibin Yu, Artur J. Jaworski

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

Abstract

In thermoacoustic devices, an acoustic wave interacts with stacks and heat exchangers in a resonator. Placing such internal structures, in what is
essentially an oscillatory flow, produces complex flow phenomena around their extremities due to the introduction of cross-sectional discontinuities. One of the
simplest geometries of stacks and heat exchangers can be imagined as a series of parallel plates; velocity profiles in the channels in between are disturbed by the entrance effects.
In this work, particle image velocimetry (PIV) is used to investigate the flow structure in the “entrance region”. Velocity profiles of the oscillating air flow
within the channel of a parallel-plate stack, placed in a standing wave resonator, were measured as a function of phase and distance from the stack end. Using the data obtained, this work attempts to quantify an “entrance length” (by analogy with existing fluid mechanical definitions). Its estimations are carried out over the half cycle of an oscillation period, when the working gas is known to flow into the stack. This is followed by the discussion of future uses of the methodology presented
LanguageEnglish
Title of host publicationProceedings of the International Congress on Ultrasonics
Subtitle of host publicationVienna, April 9-13
Number of pages4
Publication statusPublished - 9 Apr 2007
Externally publishedYes

Fingerprint

oscillating flow
particle image velocimetry
parallel plates
standing waves
entrances
resonators
exchangers
heat exchangers
velocity distribution
discontinuity
methodology
oscillations
cycles
acoustics
fluids
air
geometry
gases

Cite this

Mao, X., Yu, Z., & Jaworski, A. J. (2007). Oscillating flow in a parallel-plate stack in a standing wave thermoacoustic resonator: PIV measurements within the entrance region. In Proceedings of the International Congress on Ultrasonics: Vienna, April 9-13 [1564]
Mao, Xiaoan ; Yu, Zhibin ; Jaworski, Artur J. / Oscillating flow in a parallel-plate stack in a standing wave thermoacoustic resonator: PIV measurements within the entrance region. Proceedings of the International Congress on Ultrasonics: Vienna, April 9-13. 2007.
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Mao, X, Yu, Z & Jaworski, AJ 2007, Oscillating flow in a parallel-plate stack in a standing wave thermoacoustic resonator: PIV measurements within the entrance region. in Proceedings of the International Congress on Ultrasonics: Vienna, April 9-13., 1564.

Oscillating flow in a parallel-plate stack in a standing wave thermoacoustic resonator: PIV measurements within the entrance region. / Mao, Xiaoan; Yu, Zhibin; Jaworski, Artur J.

Proceedings of the International Congress on Ultrasonics: Vienna, April 9-13. 2007. 1564.

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

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AU - Jaworski, Artur J.

PY - 2007/4/9

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N2 - In thermoacoustic devices, an acoustic wave interacts with stacks and heat exchangers in a resonator. Placing such internal structures, in what isessentially an oscillatory flow, produces complex flow phenomena around their extremities due to the introduction of cross-sectional discontinuities. One of thesimplest geometries of stacks and heat exchangers can be imagined as a series of parallel plates; velocity profiles in the channels in between are disturbed by the entrance effects.In this work, particle image velocimetry (PIV) is used to investigate the flow structure in the “entrance region”. Velocity profiles of the oscillating air flowwithin the channel of a parallel-plate stack, placed in a standing wave resonator, were measured as a function of phase and distance from the stack end. Using the data obtained, this work attempts to quantify an “entrance length” (by analogy with existing fluid mechanical definitions). Its estimations are carried out over the half cycle of an oscillation period, when the working gas is known to flow into the stack. This is followed by the discussion of future uses of the methodology presented

AB - In thermoacoustic devices, an acoustic wave interacts with stacks and heat exchangers in a resonator. Placing such internal structures, in what isessentially an oscillatory flow, produces complex flow phenomena around their extremities due to the introduction of cross-sectional discontinuities. One of thesimplest geometries of stacks and heat exchangers can be imagined as a series of parallel plates; velocity profiles in the channels in between are disturbed by the entrance effects.In this work, particle image velocimetry (PIV) is used to investigate the flow structure in the “entrance region”. Velocity profiles of the oscillating air flowwithin the channel of a parallel-plate stack, placed in a standing wave resonator, were measured as a function of phase and distance from the stack end. Using the data obtained, this work attempts to quantify an “entrance length” (by analogy with existing fluid mechanical definitions). Its estimations are carried out over the half cycle of an oscillation period, when the working gas is known to flow into the stack. This is followed by the discussion of future uses of the methodology presented

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Mao X, Yu Z, Jaworski AJ. Oscillating flow in a parallel-plate stack in a standing wave thermoacoustic resonator: PIV measurements within the entrance region. In Proceedings of the International Congress on Ultrasonics: Vienna, April 9-13. 2007. 1564