TECHNICAL PAPERS: Porous Media, Particles, and Droplets

Formulation and Numerical Solution of Non-Local Thermal Equilibrium Equations for Multiple Gas/Solid Porous Metal Hydride Reactors

[+] Author and Article Information
George M. Lloyd

Department of Civil and Materials Engineering, University of Illinois at Chicago, 842 West Taylor Street, Chicago, IL 60607e-mail: lloydg@asme.org/glloyd@uic.edu

A. Razani, Kwang J. Kim

Department of Mechanical Engineering, University of New Mexico, Albuquerque, NM 87106

J. Heat Transfer 123(3), 520-526 (Dec 06, 2000) (7 pages) doi:10.1115/1.1370521 History: Received October 25, 1999; Revised December 06, 2000
Copyright © 2001 by ASME
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Block diagram of the heat pump system studied in the paper (left and middle). Two reactors exchange hydrogen during a cycle, and each communicates with three thermal reservoirs (right) photograph of experimental reactor.
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Boundary region at r0,t. Hydrogen at Tf(r0,t) is injected into the reactor with interface phase temperatures Tf(r0,t) and Ts(r0,t)
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Schematic diagram of conditions existing at the microscopic level dictating idealizations made for interface boundary conditions
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Stability and convergence study of numerical method. Bottom plot: Effect of λ on boundary transport of H2, for varying λ and constant zone size of Δr=0.40 (mm). Top plot: variation in integral error for two grid sizes.
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Temperature difference, TT−Ts, field for hsf=100 (W/m2⋅K)
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Temperature difference, TT−Ts, field for hsf=1000 (W/m2⋅K). Dashed lines demarcate regions of significant NLTE effects.
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Hydrogen desorption rate, φ̇ for hsf=100 (W/m2⋅K)
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Overlay of hydrogen concentration, x for hsf=100 (W/m2⋅K) (solid) with LTE (dashed)
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Comparison of two dimensionless criteria for local thermal equilibrium near the regenerator injection boundary




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