Experimental study of heat transfer from plain fins in oscillatory flow - A microscopic view of heat exchange processes in thermoacoustic devices

Xiaoan Mao, Artur J. Jaworski

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

Abstract

An experimental study of heat transfer processes taking place in a stack of plain fins placed in an acoustically induced oscillatory flow is reported. This is of critical importance for understanding the performance of stacks and heat exchangers in thermoacoustic systems. Here, a pair of heat exchangers, consisting of an electrically heated heat exchanger and a water-cooled one, both having controlled temperatures, is used. The simplified "stack-less" arrangement is adopted here to mimic the processes taking place at the interface between the stack and heat exchanger. Measurement techniques such as planar laser induced fluorescence (PLIF) thermometry and particle image velocimetry (PIV) are applied to obtain the temperature and velocity fields around the fins. By using a phase-locking mechanism, the instantaneous temperature or velocity fields around the fins, corresponding to same phases in acoustic oscillation cycles, are obtained. The statistics of the temperature and velocity data are calculated for further analysis. From the mean temperature field, the heat flux on the fin surface is calculated from the temperature gradient. Combined with the mean velocity field, the local and/or time-dependent heat fluxes are studied to reveal the mechanism of the heat transfer process between the fins and the flow. The deduced time- and spatial-averaged heat flux is used to find the heat transfer coefficient to evaluate the performance of the convective heat transfer between the fins and the oscillatory flow. Furthermore, the effects of the fluid displacement amplitude on the heat transfer process are studied. It is thought that this study will be also helpful to the understanding of the general heat transfer from a solid body in an oscillatory flow.

LanguageEnglish
Title of host publication19th International Congress on Sound and Vibration 2012, ICSV 2012
Pages1605-1612
Number of pages8
Volume2
Publication statusPublished - 1 Dec 2012
Externally publishedYes
Event19th International Congress on Sound and Vibration - Vilnius, Lithuania
Duration: 8 Jul 201212 Jul 2012
Conference number: 19

Conference

Conference19th International Congress on Sound and Vibration
Abbreviated titleICSV 2012
CountryLithuania
CityVilnius
Period8/07/1212/07/12

Fingerprint

fins
plains
heat transfer
heat exchangers
heat
heat flux
exchangers
temperature distribution
velocity distribution
convective heat transfer
particle image velocimetry
heat transfer coefficients
laser induced fluorescence
locking
temperature measurement
temperature gradients
statistics
oscillations
cycles
temperature

Cite this

Mao, X., & Jaworski, A. J. (2012). Experimental study of heat transfer from plain fins in oscillatory flow - A microscopic view of heat exchange processes in thermoacoustic devices. In 19th International Congress on Sound and Vibration 2012, ICSV 2012 (Vol. 2, pp. 1605-1612)
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title = "Experimental study of heat transfer from plain fins in oscillatory flow - A microscopic view of heat exchange processes in thermoacoustic devices",
abstract = "An experimental study of heat transfer processes taking place in a stack of plain fins placed in an acoustically induced oscillatory flow is reported. This is of critical importance for understanding the performance of stacks and heat exchangers in thermoacoustic systems. Here, a pair of heat exchangers, consisting of an electrically heated heat exchanger and a water-cooled one, both having controlled temperatures, is used. The simplified {"}stack-less{"} arrangement is adopted here to mimic the processes taking place at the interface between the stack and heat exchanger. Measurement techniques such as planar laser induced fluorescence (PLIF) thermometry and particle image velocimetry (PIV) are applied to obtain the temperature and velocity fields around the fins. By using a phase-locking mechanism, the instantaneous temperature or velocity fields around the fins, corresponding to same phases in acoustic oscillation cycles, are obtained. The statistics of the temperature and velocity data are calculated for further analysis. From the mean temperature field, the heat flux on the fin surface is calculated from the temperature gradient. Combined with the mean velocity field, the local and/or time-dependent heat fluxes are studied to reveal the mechanism of the heat transfer process between the fins and the flow. The deduced time- and spatial-averaged heat flux is used to find the heat transfer coefficient to evaluate the performance of the convective heat transfer between the fins and the oscillatory flow. Furthermore, the effects of the fluid displacement amplitude on the heat transfer process are studied. It is thought that this study will be also helpful to the understanding of the general heat transfer from a solid body in an oscillatory flow.",
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Mao, X & Jaworski, AJ 2012, Experimental study of heat transfer from plain fins in oscillatory flow - A microscopic view of heat exchange processes in thermoacoustic devices. in 19th International Congress on Sound and Vibration 2012, ICSV 2012. vol. 2, pp. 1605-1612, 19th International Congress on Sound and Vibration, Vilnius, Lithuania, 8/07/12.

Experimental study of heat transfer from plain fins in oscillatory flow - A microscopic view of heat exchange processes in thermoacoustic devices. / Mao, Xiaoan; Jaworski, Artur J.

19th International Congress on Sound and Vibration 2012, ICSV 2012. Vol. 2 2012. p. 1605-1612.

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

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T1 - Experimental study of heat transfer from plain fins in oscillatory flow - A microscopic view of heat exchange processes in thermoacoustic devices

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N2 - An experimental study of heat transfer processes taking place in a stack of plain fins placed in an acoustically induced oscillatory flow is reported. This is of critical importance for understanding the performance of stacks and heat exchangers in thermoacoustic systems. Here, a pair of heat exchangers, consisting of an electrically heated heat exchanger and a water-cooled one, both having controlled temperatures, is used. The simplified "stack-less" arrangement is adopted here to mimic the processes taking place at the interface between the stack and heat exchanger. Measurement techniques such as planar laser induced fluorescence (PLIF) thermometry and particle image velocimetry (PIV) are applied to obtain the temperature and velocity fields around the fins. By using a phase-locking mechanism, the instantaneous temperature or velocity fields around the fins, corresponding to same phases in acoustic oscillation cycles, are obtained. The statistics of the temperature and velocity data are calculated for further analysis. From the mean temperature field, the heat flux on the fin surface is calculated from the temperature gradient. Combined with the mean velocity field, the local and/or time-dependent heat fluxes are studied to reveal the mechanism of the heat transfer process between the fins and the flow. The deduced time- and spatial-averaged heat flux is used to find the heat transfer coefficient to evaluate the performance of the convective heat transfer between the fins and the oscillatory flow. Furthermore, the effects of the fluid displacement amplitude on the heat transfer process are studied. It is thought that this study will be also helpful to the understanding of the general heat transfer from a solid body in an oscillatory flow.

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Mao X, Jaworski AJ. Experimental study of heat transfer from plain fins in oscillatory flow - A microscopic view of heat exchange processes in thermoacoustic devices. In 19th International Congress on Sound and Vibration 2012, ICSV 2012. Vol. 2. 2012. p. 1605-1612