Simultaneous estimation of the emissivity and the temperature-dependent thermal conductivity and specific heat in a semitransparent plane layer by an inverse method

• Autorzy: Zmywaczyk J.
• Języki publikacji: EN

Abstrakty

EN

A model of transient ID conduction-radiation heat transfer in absorbing, emitting and isotropically scattering grey medium with boundary conditions of the third kind for temperature has been considered in this paper. It has been assumed that boundaries of the plane layer of thickness L were of diffusive character. To solve the boundary-value problem a finite difference method (FDM) together with a two-flux method (TFM) based on the Schuster-Schwarzschild approximation was used. In the inverse formulation of the problem it has been accepted as the unknown quantities the total panchromatic hemispherical emissivity [epsilon][1] of the sample surface exposed to external incident radiation and the temperature-dependent thermal conductivity k(T) and specific heat c[p](T) of the sample material. The coefficient inverse heat transfer problem (CIHTP) was solved iteratively using the Levenberg-Marquardt algorithm to find a minimum of a mean square functional J involving residuals between the measured and calculated temperatures. It has been found that the final time of measurements t[f] should be correlated with the disturbance magnitude ZAB so as to reduce uncertainty of the estimated parameters.

Słowa kluczowe

EN

inverse problems; parameter estimation; thermophysical parameters; two-flux method

PL

ocean parametrów; parametry termofizyczne; zagadnienie odwrotne

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2006
• Tom: Vol. 27, no. 3
• Strony: 39--62
• Opis fizyczny: Wz., wykr., tab.,Bibliogr. 12 poz.,

Twórcy

autor

Zmywaczyk J.

• Wojskowa Akademia Techniczna, Warszawa,

Bibliografia

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