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A Network Model for the Effective Thermal Conductivity of Rigid Fibrous Refractory InsulationsA procedure is described for computing the effective thermal conductivity of a rigid fibrous refractory insulation. The insulation is modeled as a 3-dimensional Cartesian network of thermal conductance. The values and volume distributions of the conductance are assigned to reflect the physical properties of the insulation, its constituent fibers, and any permeating gas. The effective thermal conductivity is computed by considering the simultaneous energy transport by solid conduction, gas conduction and radiation through a cubic volume of model insulation; thus the coupling between heat transfer modes is retained (within the simplifications inherent to the model), rather than suppressed by treating these heat transfer modes as independent. The model takes into account insulation composition, density and fiber anisotropy, as well as the geometric and material properties of the constituent fibers. A relatively good agreement, between calculated and experimentally derived thermal conductivity values, is obtained for a variety of rigid fibrous insulations.
Document ID
20010048683
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Marschall, Jochen
(National Academy of Sciences - National Research Council Moffett Field, CA United States)
Cooper, D. M.
Date Acquired
August 20, 2013
Publication Date
January 1, 1995
Subject Category
Nonmetallic Materials
Meeting Information
Meeting: 4th ASME/JSME Thermal Engineering Joint Conference
Location: Lahaina, HI
Country: United States
Start Date: March 19, 1995
End Date: March 24, 1995
Sponsors: American Society of Mechanical Engineers, Japan Society of Mechanical Engineers
Funding Number(s)
PROJECT: RTOP 232-01-04
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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