CFD modelling of flow and heat transfer within the parallel plate heat exchanger in standing wave thermoacoustic system

Fatimah A Z Mohd Saat, Artur J. Jaworski, Xiaoan Mao, Zhibin Yu

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

2 Citations (Scopus)

Abstract

Thermoacoustics is a sustainable technology for novel energy conversion applications. The performance of future thermoacoustic systems can be improved through a better understanding of the complex fluid flow and heat transfer phenomena that form the fundamental basis for the system construction. Here, a particular attention is focused on heat exchangers. This paper investigates the flows and heat transfer within parallel plate heat exchangers working in a thermoacoustic environment characterised by an oscillatory flow induced by a standing wave. A two-dimensional computational fluid dynamics (CFD) model was developed and validated using earlier experimental data obtained within our group. The natural convection effect which is commonly neglected in most numerical analyses was included in this computational investigation to account for temperature-driven buoyancy effects observed in experiment. The flow and heat transfer characteristics were investigated by obtaining the velocity and temperature profiles over twenty periods of a flow cycle. The velocity profile was found to be distorted due to the presence of temperature, indicating a change in the flow structure. Temperature profiles produced by the computational model agreed qualitatively with the experimental model, but with differences in magnitude particularly noticeable in the area of the hot heat exchanger. Thus the temperature profile appears to have the same trend and pattern over the whole phases investigated, apart from the slight differences in the aforementioned area. Accordingly, the space average wall heat flux was discussed for different phases and locations across both cold and hot heat exchanger. Discussion includes the effect of gravity and device orientation to the flow and heat transfer. The results thus contributed toward a better understanding of the hydrodynamic and thermal performance of the flow investigated and eventually it will assist in experimental design for future research.

LanguageEnglish
Title of host publication19th International Congress on Sound and Vibration 2012, ICSV 2012
Pages936-943
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

heat exchangers
computational fluid dynamics
parallel plates
standing waves
heat transfer
temperature profiles
velocity distribution
energy conversion
buoyancy
free convection
dynamic models
fluid flow
heat flux
hydrodynamics
gravitation
trends
cycles
temperature

Cite this

Saat, F. A. Z. M., Jaworski, A. J., Mao, X., & Yu, Z. (2012). CFD modelling of flow and heat transfer within the parallel plate heat exchanger in standing wave thermoacoustic system. In 19th International Congress on Sound and Vibration 2012, ICSV 2012 (Vol. 2, pp. 936-943)
Saat, Fatimah A Z Mohd ; Jaworski, Artur J. ; Mao, Xiaoan ; Yu, Zhibin. / CFD modelling of flow and heat transfer within the parallel plate heat exchanger in standing wave thermoacoustic system. 19th International Congress on Sound and Vibration 2012, ICSV 2012. Vol. 2 2012. pp. 936-943
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abstract = "Thermoacoustics is a sustainable technology for novel energy conversion applications. The performance of future thermoacoustic systems can be improved through a better understanding of the complex fluid flow and heat transfer phenomena that form the fundamental basis for the system construction. Here, a particular attention is focused on heat exchangers. This paper investigates the flows and heat transfer within parallel plate heat exchangers working in a thermoacoustic environment characterised by an oscillatory flow induced by a standing wave. A two-dimensional computational fluid dynamics (CFD) model was developed and validated using earlier experimental data obtained within our group. The natural convection effect which is commonly neglected in most numerical analyses was included in this computational investigation to account for temperature-driven buoyancy effects observed in experiment. The flow and heat transfer characteristics were investigated by obtaining the velocity and temperature profiles over twenty periods of a flow cycle. The velocity profile was found to be distorted due to the presence of temperature, indicating a change in the flow structure. Temperature profiles produced by the computational model agreed qualitatively with the experimental model, but with differences in magnitude particularly noticeable in the area of the hot heat exchanger. Thus the temperature profile appears to have the same trend and pattern over the whole phases investigated, apart from the slight differences in the aforementioned area. Accordingly, the space average wall heat flux was discussed for different phases and locations across both cold and hot heat exchanger. Discussion includes the effect of gravity and device orientation to the flow and heat transfer. The results thus contributed toward a better understanding of the hydrodynamic and thermal performance of the flow investigated and eventually it will assist in experimental design for future research.",
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Saat, FAZM, Jaworski, AJ, Mao, X & Yu, Z 2012, CFD modelling of flow and heat transfer within the parallel plate heat exchanger in standing wave thermoacoustic system. in 19th International Congress on Sound and Vibration 2012, ICSV 2012. vol. 2, pp. 936-943, 19th International Congress on Sound and Vibration, Vilnius, Lithuania, 8/07/12.

CFD modelling of flow and heat transfer within the parallel plate heat exchanger in standing wave thermoacoustic system. / Saat, Fatimah A Z Mohd; Jaworski, Artur J.; Mao, Xiaoan; Yu, Zhibin.

19th International Congress on Sound and Vibration 2012, ICSV 2012. Vol. 2 2012. p. 936-943.

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

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T1 - CFD modelling of flow and heat transfer within the parallel plate heat exchanger in standing wave thermoacoustic system

AU - Saat, Fatimah A Z Mohd

AU - Jaworski, Artur J.

AU - Mao, Xiaoan

AU - Yu, Zhibin

PY - 2012/12/1

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N2 - Thermoacoustics is a sustainable technology for novel energy conversion applications. The performance of future thermoacoustic systems can be improved through a better understanding of the complex fluid flow and heat transfer phenomena that form the fundamental basis for the system construction. Here, a particular attention is focused on heat exchangers. This paper investigates the flows and heat transfer within parallel plate heat exchangers working in a thermoacoustic environment characterised by an oscillatory flow induced by a standing wave. A two-dimensional computational fluid dynamics (CFD) model was developed and validated using earlier experimental data obtained within our group. The natural convection effect which is commonly neglected in most numerical analyses was included in this computational investigation to account for temperature-driven buoyancy effects observed in experiment. The flow and heat transfer characteristics were investigated by obtaining the velocity and temperature profiles over twenty periods of a flow cycle. The velocity profile was found to be distorted due to the presence of temperature, indicating a change in the flow structure. Temperature profiles produced by the computational model agreed qualitatively with the experimental model, but with differences in magnitude particularly noticeable in the area of the hot heat exchanger. Thus the temperature profile appears to have the same trend and pattern over the whole phases investigated, apart from the slight differences in the aforementioned area. Accordingly, the space average wall heat flux was discussed for different phases and locations across both cold and hot heat exchanger. Discussion includes the effect of gravity and device orientation to the flow and heat transfer. The results thus contributed toward a better understanding of the hydrodynamic and thermal performance of the flow investigated and eventually it will assist in experimental design for future research.

AB - Thermoacoustics is a sustainable technology for novel energy conversion applications. The performance of future thermoacoustic systems can be improved through a better understanding of the complex fluid flow and heat transfer phenomena that form the fundamental basis for the system construction. Here, a particular attention is focused on heat exchangers. This paper investigates the flows and heat transfer within parallel plate heat exchangers working in a thermoacoustic environment characterised by an oscillatory flow induced by a standing wave. A two-dimensional computational fluid dynamics (CFD) model was developed and validated using earlier experimental data obtained within our group. The natural convection effect which is commonly neglected in most numerical analyses was included in this computational investigation to account for temperature-driven buoyancy effects observed in experiment. The flow and heat transfer characteristics were investigated by obtaining the velocity and temperature profiles over twenty periods of a flow cycle. The velocity profile was found to be distorted due to the presence of temperature, indicating a change in the flow structure. Temperature profiles produced by the computational model agreed qualitatively with the experimental model, but with differences in magnitude particularly noticeable in the area of the hot heat exchanger. Thus the temperature profile appears to have the same trend and pattern over the whole phases investigated, apart from the slight differences in the aforementioned area. Accordingly, the space average wall heat flux was discussed for different phases and locations across both cold and hot heat exchanger. Discussion includes the effect of gravity and device orientation to the flow and heat transfer. The results thus contributed toward a better understanding of the hydrodynamic and thermal performance of the flow investigated and eventually it will assist in experimental design for future research.

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M3 - Conference contribution

SN - 9781622764655

VL - 2

SP - 936

EP - 943

BT - 19th International Congress on Sound and Vibration 2012, ICSV 2012

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Saat FAZM, Jaworski AJ, Mao X, Yu Z. CFD modelling of flow and heat transfer within the parallel plate heat exchanger in standing wave thermoacoustic system. In 19th International Congress on Sound and Vibration 2012, ICSV 2012. Vol. 2. 2012. p. 936-943