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ALTERNATIVE MODELS FOR OPTICAL PROPERTIES OF A HIGHLY-POROUS MEDIUM COMPOSED OF WOOD CHIPS

DOI: 10.1615/RAD-19.120
pages 93-100

Leonid A. Dombrovsky
Joint Institute for High Temperatures, 17A Krasnokazarmennaya Str., Moscow, 111116, Russia; Tyumen State University, 6 Volodarsky Str., Tyumen, 625003, Russia

Pierre Lea
GRESPI - EA 4694, University of Reims Champagne-Ardenne, F-51687 Reims, France

Didier Caron
GRESPI - EA 4694, University of Reims Champagne-Ardenne, F-51687 Reims, France

Jean-François Henry
GRESPI - EA 4694, University of Reims Champagne-Ardenne, F-51687 Reims, France

Hervé Pron
GRESPI - EA 4694, University of Reims Champagne-Ardenne, F-51687 Reims, France

Jaona Harifidy Randrianalisoa
Centre de Thermique de Lyon, Institut National des Sciences Appliqués, Lyon; GRESPI - EA 4694, University of Reims Champagne-Ardenne, F-51687 Reims, France

Abstract

The highly-porous layer of oakwood chips is used as a relatively pure reference material in laboratory studies of heating, drying and pyrolysis of organic waste. The general computational model for thermo-chemical processes accompanying the industrial production of a synthesis gas and bio-diesel fuels includes thermal radiation, which is one of the important heat transfer modes. Therefore, a relatively simple model for spectral optical properties of a medium composed of wood chips is desirable to avoid time-consuming calculations. Such a model based on analytical solution for diffusely irradiated wood plates is suggested in the paper. A comparison with direct numerical simulation of radiative transfer confirms good accuracy of the model. A similar approach can be recommended to estimate optical properties of other semi-transparent disperse systems containing randomly oriented large particles.

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