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NET HEAT FLUX IDENTIFICATION USING DIGITIZED TEMPERATURE DATA IN REACTOR ACCIDENTS WITH HOT SPOT FORMATION ON THIN WALL WITH VARIABLE THERMAL CONDUCTIVITY

DOI: 10.1615/ICHMT.1995.RadTransfProcHeatMassTransfSevNuclReactAcc.480

Alexander I. Ilyinsky
Chemical Engineering Department, Ege University, 35100, Bornova, Izmir, Turkey

Resumo

This paper presents a new technique for restoration of net heat flux distribution over hot spots on a thin conductive wall with variable thermal conductivity using surface temperature measurements with digitizing errors Asymptotic theory has been used to describe temperature distribution in a thin 3-D solid body in severe thermal environment. Using the Kirchhoff transformation, the solution of an inverse source boundary problem has been found as linear superposition of the eigenfunctions of 2-D Laplacian. The optimal Wiener filtration of an initial temperature data has been implemented as a preprocessing procedure to improve the conditionness of the inverse problem in discrete formulation. The best possible accuracy in heat flux restoration based on a Wiener filtration has been estimated for two different walls made of AISI 316 and AISI 1010 steel, respectively. The effect of variable thermal conductance of the wall has been studied for different temperature factors.

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