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Comparison of Different Heat Exchanger Models in a Thermoacoustic Engine Simulation

[+] Author Affiliations
Catherine Weisman, Diana Baltean-Carlès

LIMSI-CNRS and University Pierre and Marie Curie, Orsay, France

Patrick Le Quéré

LIMSI-CNRS, Orsay, France

Luc Bauwens

University of Calgary, Calgary, AB, Canada

Paper No. FEDSM-ICNMM2010-31166, pp. 123-130; 8 pages
doi:10.1115/FEDSM-ICNMM2010-31166
From:
  • ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels
  • ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 2, Fora
  • Montreal, Quebec, Canada, August 1–5, 2010
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-4949-1 | eISBN: 978-0-7918-3880-8
  • Copyright © 2010 by ASME

abstract

The role of unavoidable space between heat exchangers and stack inside a thermoacoustic standing wave generator is investigated. A two-dimensional Low Mach number viscous and heat conducting flow model of the active thermoacoustic cell, comprising heater and cooler separated by a stack made of parallel conducting plates, is described. Three different models of heat exchangers are implemented and compared. Ideal heat exchangers consist of a fluid zone with imposed temperature. The other two models are made up of stacks of horizontal plates, either with specified wall temperatures, in one model and with constant prescribed heat fluxes in the other. A multiple scale analysis allows for coupling the active thermoacoustic cell model with the flow inside the resonator, obtained as a solution to a linear acoustic formulation. When a large enough temperature difference is applied between the heat exchangers, initial pressure perturbations grow. Different resonant modes are amplified for different configurations, in the same way as in experimental observations.

Copyright © 2010 by ASME

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