CAPILLARY PRESSURE: SOME STATIC AND DYNAMIC VIEWS IN SEMI-ORDERED MEDIA AND THEIR APPLICABILITY TO WOOD DRYING

Autor:	G. William Slade
Rok vydání:	1998
Předmět:	Mesoscopic physics Capillary pressure Chemistry Capillary action General Chemical Engineering Thermodynamics Mechanics Wood drying Control volume Capillary number Physics::Fluid Dynamics Fluid dynamics Physical and Theoretical Chemistry Porous medium
Zdroj:	Drying Technology. 16:1-13
ISSN:	1532-2300 0737-3937
DOI:	10.1080/07373939808917389
Popis:	In most situations where vapor-liquid motion is simulated within porous media, one often sees the conflicting notions of ‘continuous water column’ used alongside the concept of ‘well-mixed liquid-gas system’ within a control-volume. This assumption clearly breaks down when the computational control volume approaches the structural cell dimensions. The ‘grainyness’ of the cell structure and the fluid flow patterns cannot be neglected any longer, if accurate descriptions of water (or any other fluid) content are to be generated. This would be useful especially in predicting the onset of hygroscopicity in regions where the liquid saturation begins to vanish during drying. Using arguments based on a simple mechanical potential energy formulation, the multiplicity of equilibrium states for a fluid/gas system in a semi-ordered structure (where capillary forces dominate, e.g. softwoods) will be explored. By these methods, it is hoped that insight into capillary motion on a mesoscopic scale can be gained.
Databáze:	OpenAIRE
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