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An Initial Non-Equilibrium Porous-Media Model for CFD Simulation of Stirling RegeneratorsThe objective of this paper is to define empirical parameters for an initial thermal non-equilibrium porous-media model for use in Computational Fluid Dynamics (CFD) codes for simulation of Stirling regenerators. The two codes currently used at Glenn Research Center for Stirling modeling are Fluent and CFD-ACE. The codes porous-media models are equilibrium models, which assume solid matrix and fluid are in thermal equilibrium. This is believed to be a poor assumption for Stirling regenerators; Stirling 1-D regenerator models, used in Stirling design, use non-equilibrium regenerator models and suggest regenerator matrix and gas average temperatures can differ by several degrees at a given axial location and time during the cycle. Experimentally based information was used to define: hydrodynamic dispersion, permeability, inertial coefficient, fluid effective thermal conductivity, and fluid-solid heat transfer coefficient. Solid effective thermal conductivity was also estimated. Determination of model parameters was based on planned use in a CFD model of Infinia's Stirling Technology Demonstration Converter (TDC), which uses a random-fiber regenerator matrix. Emphasis is on use of available data to define empirical parameters needed in a thermal non-equilibrium porous media model for Stirling regenerator simulation. Such a model has not yet been implemented by the authors or their associates.
Document ID
Document Type
Technical Memorandum (TM)
Tew, Roy C.
(NASA Glenn Research Center Cleveland, OH, United States)
Simon, Terry
(Minnesota Univ. Minneapolis, MN, United States)
Gedeon, David
(Gedeon Associates Athens, OH, United States)
Ibrahim, Mounir
(Cleveland State Univ. Cleveland, OH, United States)
Rong, Wei
(Cleveland State Univ. Cleveland, OH, United States)
Date Acquired
August 23, 2013
Publication Date
October 1, 2006
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
Meeting Information
Fourth International Energy Conversion Engineering Conference and Exhibit (IECEC)(San Diego, CA)
Funding Number(s)
WBS: WBS 494-04-01-01
Distribution Limits
Public Use Permitted.
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