Convective heat and mass transfer modelling at air-porous material精品.pdfVIP

Accepted for publication in Chemical Engineering Science, February 21, 2012 Convective heat and mass transfer modelling at air-porous material interfaces: overview of existing methods and relevance Thijs Defraeye a *, Bert Blocken b, Dominique Derome c, Bart Nicolai a, Jan Carmeliet d,e a VCBT / MeBioS, Department of Biosystems, Katholieke Universiteit Leuven, Willem de Croylaan 42, 3001 Heverlee, Belgium b Building Physics and Services, Eindhoven University of Technology, P.O. Box 513, 5600 Eindhoven, The Netherlands c Department of Civil and Mechanical Engineering, Swiss Federal Laboratories for Materials Testing and Research (Empa), Überlandstrasse 129, 8600 Dübendorf, Switzerland d Chair of Building Physics, Swiss Federal Institute of Technology Zurich (ETHZ), Wolfgang-Pauli-Strasse 15, 8093 Zürich, Switzerland e Laboratory for Building Science and Technology, Swiss Federal Laboratories for Materials Testing and Research (Empa), Überlandstrasse 129, 8600 Dübendorf, Switzerland Keywords convective transfer coefficient; conjugate modelling; porous material; computational fluid dynamics; drying; air flow Abstract Accurate predictions of convective heat and mass transfer at air-porous material interfaces are essential in many engineering applications, one example being optimisation of industrial drying processes with respect to energy consumption and product quality. For porous-material modelling purposes, simplified convective transfer coefficients (CTCs) are often used to avoid explicit air-flow modelling. Alternatively, conjugate models have been introduced recently and are being more widely used. Conjugate modelling has the advantage that it does not require the use of CTCs or of the heat