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Determination of moisture diffusivity in porous media using scanning neutron radiography

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  • Chemistry
  • Engineering

Abstract

PII: S0017-9310(05)80095-X hr. J. Heur Muss Tmnsler. Vol. 36, No 5. ,,p. IX-1267. 1993 0017-9310193 $6.00+0.00 Primed in Great Britain c 1993 Pcrpamon Press Ltd Determination of moisture diffusivity in porous media using scanning neutron radiography L. PEL,t A. A. J. KETELAARSS and 0. C. G. ADANt tDepartment of Architecture and Building Technology (FAGO), and IDepartment of Chemical Engineering (TCP), Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands and A. A. VAN WELL Delft University of Technology, Interfacultair Reactor Instituut, Mekelweg 15.2629 JB Delft, The Netherlands (Recehed 7 April 1992) Abstract-A technique for measuring moisture concentration profiles based on scanning neutron radi- ography is presented. With this technique moisture concentration profiles have been measured during drying of brick and kaolin clay. The isothermal moisture diffusivity as a function of moisture content could be determined directly from these profiles. An error analysis shows that the minimum spatial resolution for scanning should be 0.5 mm. If this condition is not satisfied, it is not possible, for example, to detect the minimum in the moisture dilTusivity in the case of a receding drying front. 1. INTRODUCTION MODELLING heat and mass transfer in porous media is an area of continuing research in various disciplines, e.g. chemical engineering, civil engineering and soil science. For describing heat and mass transport in such media a model at the macroscopic scale is necess- ary, allowing the porous material to be looked upon as a continuum. The basic equations for heat and mass transfer at this level were first established by Philip and de Vries [I]. Various authors, e.g. refs. [2,3] have tried to derive this description at the macroscopic scale by means of applying the volume averaging tech- nique to the microscopic equations. Although insight into the problem improved as a result of this, it is not yet possib

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