The effect of boundary conditions on effective thermal conductivity of heterogeneous materials in transient state

• Autorzy: Polesek-Karczewska, S.
• Języki publikacji: EN

Abstrakty

EN

The measured temperature distributions in the layer of heated packed bed is presented in the paper. Analytical solutions of Fourier heat conduction equation for two different boundary conditions are found. The comparison of between the experimental data and theoretical predictions are used to estimate the corresponding values of effective thermal conductivity, which is the matching parameter of considered problem. The analysis leads to the conclusion that the contribution of radiation mechanism in the transient processes in non-homogeneous materials may be considerable for the jump boundary conditions.

Słowa kluczowe

EN

conduction; packed bed; radiation; thermal conductivity

• Czasopismo: Archives of Thermodynamics
• Rocznik: 2003
• Tom: Vol. 24, no 4
• Strony: 3-14
• Opis fizyczny: Bibliogr. 9 poz.,

Twórcy

autor

Polesek-Karczewska, S.

• Institute of Fluid Flow Machinery, Polish Academy of Sciences, Fiszera 14, 80-952 Gdańsk

Bibliografia

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• [4] HERWIG H., BECKERT K.: Experimental evidence about the controversy concerning Fourier or non-Fourier heat conduction in materials with a nonhomogeneous inner structure, Heat and Mass Transfer, 36(2000), 387-392.
• [5] POLESEK-KARCZEWSKA S.: Transient Heat Transfer in Packed Beds, Ph.D. thesis, IFFM PASC., Gdańsk 1999, (in Polish),
• [6] CARSLAW H. S., JAEGER J. C. Conduction of Heat in Solids, Chap. 3, Oxford Univ. Press, Oxford 1959.
• [7] TAUTZ H.: Heat Conduction and Temperature Balancing, Verlag Chemie, Weinheim, 1971 (in German).
• [8] MYERS G. E.: Analytical Methods in Conduction Heat Transfer, App. E, McGraw- Hill, 1971.
• [9] POLESEK-KARCZEWSKA S.: Effective thermal conductivity of packed beds of spheres in transient heat transfer, Heat and Mass Transfer, 39(2003), 375-380.