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Drying in capillary-porous media

Posted on:1992-06-05Degree:Ph.DType:Dissertation
University:North Carolina State UniversityCandidate:Robbins, Mary ClareFull Text:PDF
GTID:1472390017950061Subject:Engineering
Abstract/Summary:
Drying in capillary-porous media is studied by using Luikov's model of simultaneous heat and mass transfer in planar and cylindrical geometries and effects of various dimensionless parameters such as Luikov, Posnov, and Kossovich numbers on the resulting temperature, moisture, and pressure distributions are examined. An inverse problem of heat and mass diffusion is presented for the estimation of thermophysical properties from the measurements of local temperature and moisture content. In the second chapter, exact analytical solutions are developed for the temperature and moisture distributions in a planar medium by using a decoupling procedure to solve the governing partial differential equations of heat and mass transfer. A parametric survey is performed to illustrate the effects of various dimensionless parameters on heat and mass diffusion.;In the third chapter, a cylindrical medium is considered. Exact analytical solutions are developed by generalizing the decoupling procedure for the cylindrical medium. A comparison of temperature and moisture fields for the cylinder and the slab is given.;The fourth chapter is concerned with the inverse problem of property determination of drying in capillary-porous planar medium by using simulated measurements of local temperature, local moisture content, and total moisture removed from the medium.;In the final chapter, the effects of pressure in drying of capillary-porous planar media are examined. Exact analytical solutions for temperature, moisture, and pressure are obtained by extending the decoupling procedure used previously to this system of three equations. The influence of the dimensionless parameters on the temperature, moisture, and pressure distributions in the medium are presented graphically.
Keywords/Search Tags:Capillary-porous, Drying, Moisture, Heat and mass, Temperature, Dimensionless parameters, Medium, Exact analytical solutions
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