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  • Author or Editor: J. Durastanti x
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Abstract  

The spiral plate heat exchanger (SHE) is widely used in plenty of industrial services in full counter current flow liquid-liquid heat exchange. We have produced a thermal modelling of the heat exchanges in both steady-state and time dependent cases with 2D spiral geometry, allowing computation with different materials, forced convective heat transfer models in turbulent flow and geometrical parameters options. We will display here some results in steady-state conditions in order to improve the exchanger performances.

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Abstract  

We show here an adaptation of the classical Flash Method permitting the measure of the thermal conductivity of semi-transparent porous materials. A flash lamp send a heat pulse on the upper face of a cylindrical sample and lower face temperature is analysed. The semi-transparent material is sandwiched between two copper slices. The sample used scatters thermal radiation, and absorbs it very little. It is therefore possible to account for two parts of heat transfer through the material: a pure conductive phenomenon and a radiative one. In most insulating materials radiative transfer represents about 1/3 of the total heat flux at the ambiant temperature. The problem is solved with electrical analogy, quadripoles technique and Laplace transform. The modelization brings out two physical character parameters of the material and a coefficient qualifying the thermal exchange between the sample and the environment during the experiment.

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