ARTICLE:

• INVERSE ESTIMATION OF THE TRANSIENT BEHAVIOR FORA TWO-LAYER CONCENTRIC CIRCULAR CYLINDER WITH INTERFACE THERMAL RESISTANCE  download article

S. K. Wu
Industrial Technology Research Institute, Hsinchu, Taiwan

H. S. Chu
Industrial Technology Research Institute, Hsinchu, Taiwan

ABSTRACT

This work presents a numerical analysis on estimating the transient behavior of a two-layer concentric circular cylinder by an inverse method. To consider the interface thermal resistance between the two layers, the acoustic mismatch model is employed. In this study, the space-marching technique is adopted to solve the inverse heat conduction problem. The influences of interface thermal resistance, measurement locations, curvature of cylinder and measurement errors are studied in detail. The results show that the inverse method accurately estimated the surface conditions and temperature distributions in a two-layer system even with an abrupt temperature drop in the interface. The best inverse solution is obtained with the sensor closest to the unknown boundary. The inaccuracy will be magnified by interface thermal resistance and curvature. Furthermore, the differences between exact and estimated values are amplified when α₂/α₁ and k₂/k₁ increase.

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CND-06 pages

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