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A correlation function for thermal properties estimation applied to a large thickness sample with a single surface sensor

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3 Author(s)
Lima e Silva, S.M.M. ; Department of Mechanical Engineering, Federal University of Uberlândia Campus Santa Mônica, Uberlândia 38400 902 MG, Brazil ; Duarte, M.A.V. ; Guimaraes, G.

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This article describes an experimental technique to measure simultaneously the thermal diffusivity and thermal conductivity of nonmetallic materials. The method is applied to a large thickness sample and uses a single temperature sensor located at the heating surface of a perspex sample. In addition the golden section optimization technique is used with parameter estimation for minimizing two different objective functions. Each of the thermal properties is estimated in a different way. The diffusivity estimation uses a correlation function estimator between heat flux and temperature while a square function error of experimental and estimated temperatures is the objective function used for determining the conductivity. A comparison with the guarded hot plate method indicates a deviation of 2.1% of the thermal conductivity. An error analysis for both properties is also presented. © 1998 American Institute of Physics.

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Review of Scientific Instruments  (Volume:69 ,  Issue: 9 )