Mise au point de dispositifs de caracterisation thermophysique de materiaux isolants solides ou pateux - extensions aux fluides cisailles

Abstract : We develop a new simple device based on existing methods to estimate thermophysical properties of insulating materials. We determine the thermal conductivity and the volumic heat of a sample. The classical probe offers all the advantages of a sensor. In a compact device, we have a no intrusive instrument, which can by calibration determine many properties of a material (moisture, density, etc). The new device proposed here tries to combine all the advantages of the previous methods. The main idea is to control the heat flux diffusion inside the insulating sample by addition of a highly conductive metal support. The conducting layer is then a simple technological means to impose boundary conditions. No regulated heat sink and flux meter is then needed. The thermal excitation is applied with a heating disc or ribbon. A development of this kind of device is considered for the thermal characterization of a fluid layer sheared (in Couette flow) by a brass cylindrical block in rotation. It is not necessary to instrument the moving parts on the experimental device. The modeling developed using an extension of the quadripole formalism, takes account of the twodimensional conductive transfer in the sample, and the semi-infinite medium. The comparison of the more or less simplified models, and the study of sensitivity, proves it is possible to estimate 3 parameters : the inertia of the probe (estimated on a material of reference), the volumic heat of the sample, and the thermal conductivity of the sample. An experimental study on materials of reference validate our methods and some examples of applications are presented
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Bruno Ladevie. Mise au point de dispositifs de caracterisation thermophysique de materiaux isolants solides ou pateux - extensions aux fluides cisailles. Mécanique [physics.med-ph]. Arts & Métiers Paristech, 1998. Français. ⟨NNT : 1998ENAM0035⟩. ⟨tel-01857494⟩

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