Numerical study of oscillatory flow and heat transfer in a loaded thermoacoustic stack


Journal Article

A two-dimensional, low-Mach-number computational model is used to analyze the unsteady flow and temperature fields in the neighborhood of an idealized stack heat exchanger configuration. The model relies on a vorticity-based formulation of the mass, momentum, and energy equations in the low-Mach-number, short-stack limit. The stack and heat exchangers are assumed to consist of flat plates of equal thickness. The heat exchanger plates are assumed isothermal and in perfect thermal contact with the stack plates. The simulations are used to study the effect of heat exchanger size and operating conditions on the heat transfer and stack performance. Computed results show that optimum stack performance is achieved when the length of the heat exchanger is nearly equal to the peak-to-peak particle displacement. Numerical estimates of the mean enthalpy flux within the channel are in good agreement with the predictions of linear theory. However, the results reveal that a portion of the heat exchangers is ineffective due to reverse heat transfer. Details of the energy flux density around the heat exchangers are visualized, and implications regarding heat exchanger design and model exension are discussed. © 1999, Taylor & Francis Group, LLC. All rights reserved.

Full Text

Duke Authors

Cited Authors

  • Worlikar, AS; Knio, OM

Published Date

  • January 1, 1999

Published In

Volume / Issue

  • 35 / 1

Start / End Page

  • 49 - 65

Electronic International Standard Serial Number (EISSN)

  • 1521-0634

International Standard Serial Number (ISSN)

  • 1040-7782

Digital Object Identifier (DOI)

  • 10.1080/104077899275362

Citation Source

  • Scopus