Numerical treatment of transient diffussion in shrinking or swelling solids
The diffusion equation for solids that undergo change of volume was numerically integrated, using a frame of reference fixed to the volume average velocity of the system. Numerical solutions are reported for absorption and desorption processes in swelling and shrinking systems, respectively, with sl...
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1995
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07351933_v22_n4_p527_Viollaz http://hdl.handle.net/20.500.12110/paper_07351933_v22_n4_p527_Viollaz |
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| Sumario: | The diffusion equation for solids that undergo change of volume was numerically integrated, using a frame of reference fixed to the volume average velocity of the system. Numerical solutions are reported for absorption and desorption processes in swelling and shrinking systems, respectively, with slab, cylindrical or spherical geometry. Uniform initial concentration, constant surface concentration, symmetry with respect to the centre, central axis or central plane of the system and diffusion coefficient independent on diffusant concentration were assumed. Plots in terms of dimensionless concentration of diffusant versus Fourier number based on the initial half-thickness of the system are reported, covering different concentration ranges of diffusant. © 1995. |
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