Heat transfer on parallel plate heat exchangers in an oscillatory flow

Xiaoan Mao, Lei Shi, Artur J. Jaworski, Wasan Kamsanam

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

Abstract

In thermoacoustic devices, an acoustic wave interacts with internal solid structures such as thermoacoustic stacks (regenerators), to either produce acoustic power due to an imposed temperature gradient, or to produce a heat pumping effect by an acoustic excitation. A cold and hot heat exchangers are usually placed on either side of these internal solid structures to enable heat communication between the thermoacoustic devices and their surroundings. Heat exchangers of various geometries have been extensively studied in steady flows and results are available from a collection of published articles and handbooks. However, there is still a lack of data for heat exchangers in an oscillatory flow, because the interaction of oscillatory flow with the solid boundary is governed by complicated fluid flow and heat transfer processes that are not fully understood. This work is a step towards a better understanding of the heat transfer mechanisms in the acoustically induced oscillatory flow within thermoacoustic systems, in particular obtaining the quantitative description of the heat transfer between heat exchangers and the stack. The assembly of a stack and heat exchangers is replaced by a simplified "stack-less" pair of heat exchangers, in order to focus on the generic heat transfer processes rather than the intricacies of practical thermoacoustic systems. The fins of the hot and cold heat exchangers are kept at constant temperatures by virtue of resistive heating and water cooling, respectively. Planar Laser Induced Fluorescence (PLIF) and Particle Image Velocimetry (PIV) are used to obtain the temperature and velocity fields around the fins. The heat flux between the heat exchanger fins and the fluid is analyzed phase-by-phase. The time dependent local heat transfer coefficient is obtained from the temperature gradient in the thermal boundary layer. The measurements are conducted at various levels of acoustic excitation in order to study the correlation between the non-dimensional heat transfer coefficient Nu and the Reynolds number. The effect of the flow behaviour at the end of the plates on the temperature field in the region is also studied. It is hoped that this work could lead to a better understanding of heat transfer on short plates in the acoustically induced oscillatory flows.

LanguageEnglish
Title of host publicationASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010
Pages653-661
Number of pages9
Volume2
DOIs
Publication statusPublished - 1 Dec 2010
Externally publishedYes
EventAmerican Society of Mechanical Engineers10th Biennial Conference on Engineering Systems Design and Analysis - Istanbul, Turkey
Duration: 12 Jul 201014 Jul 2010

Conference

ConferenceAmerican Society of Mechanical Engineers10th Biennial Conference on Engineering Systems Design and Analysis
Abbreviated titleASME / ESDA
CountryTurkey
CityIstanbul
Period12/07/1014/07/10

Fingerprint

Heat exchangers
Thermoacoustics
Heat transfer
Acoustics
Thermal gradients
Heat transfer coefficients
Regenerators
Cooling water
Steady flow
Velocity measurement
Heat flux
Flow of fluids
Boundary layers
Temperature distribution
Reynolds number
Fluorescence
Acoustic waves
Heating
Temperature
Fluids

Cite this

Mao, X., Shi, L., Jaworski, A. J., & Kamsanam, W. (2010). Heat transfer on parallel plate heat exchangers in an oscillatory flow. In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010 (Vol. 2, pp. 653-661) https://doi.org/10.1115/ESDA2010-24760
Mao, Xiaoan ; Shi, Lei ; Jaworski, Artur J. ; Kamsanam, Wasan. / Heat transfer on parallel plate heat exchangers in an oscillatory flow. ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010. Vol. 2 2010. pp. 653-661
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Mao, X, Shi, L, Jaworski, AJ & Kamsanam, W 2010, Heat transfer on parallel plate heat exchangers in an oscillatory flow. in ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010. vol. 2, pp. 653-661, American Society of Mechanical Engineers10th Biennial Conference on Engineering Systems Design and Analysis, Istanbul, Turkey, 12/07/10. https://doi.org/10.1115/ESDA2010-24760

Heat transfer on parallel plate heat exchangers in an oscillatory flow. / Mao, Xiaoan; Shi, Lei; Jaworski, Artur J.; Kamsanam, Wasan.

ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010. Vol. 2 2010. p. 653-661.

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

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Mao X, Shi L, Jaworski AJ, Kamsanam W. Heat transfer on parallel plate heat exchangers in an oscillatory flow. In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010. Vol. 2. 2010. p. 653-661 https://doi.org/10.1115/ESDA2010-24760