Experimental and Theoretical Modeling of the Effective Thermal Conductivity of Rough Steel Spheroid Packed Beds

[+] Author and Article Information
G. Buonanno, A. Carotenuto, G. Giovinco, N. Massarotti

Dipartimento di Meccanica Strutture Ambiente e Territorio (Di.M.S.A.T.), Università di Cassino, Via Di Biasio 43, 03043 Cassino, Italia

J. Heat Transfer 125(4), 693-702 (Jul 17, 2003) (10 pages) doi:10.1115/1.1578504 History: Received August 05, 2002; Revised March 14, 2003; Online July 17, 2003
Copyright © 2003 by ASME
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(a) The experimental apparatus; and (b) Measurement chamber
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Surface roughness and mean absolute slope of the spheroids used in the analysis: (a) lapped spheroids (σ=0.02 μm and m=0.0017), (b) prelapped spheroids (σ=0.11 μm and m=0.0054), (c) hard grinded spheroids (σ=0.96 μm and m=0.0231), and (d) soft grinded spheroids (σ=1.20 μm and m=0.0270)
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Elementary cell in a) SC and b) BCC packed beds
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Modified elementary cells adopted in the numerical model
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Mechanical model of the surfaces in contact
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(a) Dimensionless contact radius; and (b) mean thermal conductance trends versus the equivalent peak height standard deviation
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(a) Typical temperature; and (b) effective thermal conductivity trends measured
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Effective thermal conductivity as the peak height standard deviation varies for (a) face centered cubic, and (b) simple cubic packed bed (dots are experimental data with the corresponding measurement uncertainty, continuous line is the present numerical model with the corresponding uncertainty represented by dashed lines)




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