Abstract
The idea of an effective diffusivity of a composite normally requires the assumption that the composite is quasihomogeneous, i.e. the size of the individual particles of the phases is small compared with the size of sample. Using the laser flash technique it is investigated to what extent this assumption has to be fulfilled in defining an effective thermal diffusivity for heterogeneous materials. Samples of the following geometry were examined: disc-shaped pores in metals, copper spheres in Plexiglass, Plexiglass discs in metals and molten materials in non-transparent capsules. The results are interpreted on the background of the model of the effective diffusivity, where the encapsulated phase is characterized by a shape factor and a definite orientation with respect to the heat flow in the sample.
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References
E. Kröner, B. Schulz; Workshop on Composites 8 ETCP Sept. 1982 Baden-Baden High-Temperatures High Pressures, in print.
B. Schulz; Report KernforschungsZentrum Karlsruhe 1974 KfK 1988.
G. Ondracek; Report Kernfors chungs Zentrum Karlsruhe 1978 KfK 2688
C.J. Maxwell; A Treatise on Electricity and Magnetism, Oxford Clarenden Press (1904) Vol. 1.
D.A.G. Bruggemann; Ann. Phys. 24 (1935) 636.
W. Niesel; Ann. Phys. 10 (1952) 336.
G. Ondracek; Zeitschrift für Werkstofftechnik 8 (1974) 416.
B. Schulz; High-Temp. High Press. 13 (1981) 649.
W.D. Sältzer; Zur Theorie und Messung von Eigenschaftskenngrössen zweiphasiger Werkstoffe im plastisch-viskosen Verformungsbereich. Thesis University Karlsruhe 1983 (KfK 3581) und W.D. Sältzer, B. Schulz; Proc. 4th RISØ; Symposium on Metallurgy and Materials Science 1983; Deformation on Multi-phase and particle containing Materials, p. 511–524 (in English).
R.E. Taylor; High Temp. High Press. 11 (1979) 43.
W. Rapp; Report Kernforschungszentrum Karlsruhe, (1983) KfK 3616
R.E. Taylor; High Temp. High Press. 12 (1980) 147.
C.H. Smitheless; Metals Reference book Vol. III 4th Edition London, Butterworth 1967.
Gnelins Handbuch der anorganischen Chemie 8. Auflage Band Blei Teil 4C Verbindungen Syst. Nr. 47 Band 47 Verlag Chemie GmbH Weiriheim/Bergstrasse - 1971.
D’Ans’Lax (Ed.); Taschenbuch für Chemiker und Physider Vol. 1 Springer Verlag Berlin 1967.
Ullmanns Enzyklopädie der technischen Chemie 3. Auflage Band 11 Urban and Schwarzenberg Müchen-Berlin 1960.
U. Stille; Archiv Elektrotechnik 38 (1944) 91.
H.A. Tasman, D. Pel, J. Richter, H.E. Schmidt; 8th European Conf. on Thermophys. Properties, Baden-Baden 27.09.-01.10.1982, in High Temperature — High Pressure, in print.
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© 1985 Purdue Research Foundation
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Schulz, B. (1985). On the Effective Thermal Diffusivity of Macroscopic Heterogeneous Two Phase Materials. In: Ashworth, T., Smith, D.R. (eds) Thermal Conductivity 18. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-4916-7_4
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DOI: https://doi.org/10.1007/978-1-4684-4916-7_4
Publisher Name: Springer, Boston, MA
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