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REVISTA DE CHIMIE
Cite as: Rev. Chim.
https://doi.org/10.37358/Rev.Chim.1949

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Revista de Chimie (Rev. Chim.), Year 2010, Volume 61, Issue 12,





IOAN MAMALIGA, WILHELM SCHABEL,STELIAN PETRESCU
Characterization of Water Vapour Diffusion into Spherical Silica Gel Particles

Abstract:

Effective diffusion coefficients of water vapour in pure and calcium chloride and lithium bromide impregnated silica gel particles have been experimentally determined. The experiments were carried out at 323 K using spherical particles with 3.57 mm in diameter. Diffusion coefficients were determined from experimental registration of water sorption kinetics. The measurements were performed in a constant pressure unit based on a magnetic suspension balance (Rubotherm) under isothermal conditions. The apparent water diffusivity depends itself on the adsorption equilibrium taking into account the local slope of the water sorption isotherm. The effective diffusivity of water is almost three times lower in impregnated silica gel than in non-impregnated silica gel. Keywords: diffusions coefficients, composite silica gel - calcium chloride, lithium bromide

Issue: 2010, Volume 61, Issue 12
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