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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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References

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Kim,  K. J., Feldman,  K. T., Lloyd,  G., Razani,  A., and Shanahan,  K. L., 1998, “Performance of High Power Metal Hydride Reactors,” Int. J. Hydrogen Energy, 23 (5), pp. 355–362.
Lloyd,  G., Kim,  K. J., Razani,  A., and Feldman,  K. T.1998, “Thermal Conductivity Measurements of Metal Hydride Compacts Developed for High Power Reactors,” J. Thermophys. Heat Transfer, 12 (1), pp. 132–137.
Lloyd,  G., Razani,  A., and Feldman,  K. T.1998, “Transitional Reactor Dynamics Affecting Optimization of a Heat-Driven Metal Hydride Refrigerator,” Int. J. Heat Mass Transf., 41 (3), pp. 513–427.
Lloyd,  G., Razani,  A., and Kim,  K. J., 1998, “Performance Characteristics of a Compressor-Driven Metal Hydride Refrigerator,” J. Energy Resour. Technol., 120 (4), pp. 305–313.
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Lloyd, G. M., 1998, “Optimization of Heat and Mass Transfer in Metal Hydride Systems.” Ph.D. thesis, University of New Mexico, Albuquerque, NM.
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Figures

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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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