Publicou 18 edições por ano
ISSN Imprimir: 1064-2285
ISSN On-line: 2162-6561
Indexed in
MASS TRANSPORT OF LIQUID AMMONIA IN FIBER MODIFICATION PROCESS
RESUMO
This research simplified the yarn bobbin as a hollow cylinder and treated it as a porous medium, then established a model of mass transport which considered not only diffusion but also capillary flow. The basic properties of four samples are determined by experiments, e.g., the porosity and permeability. The capillary force equation of the imbibition process (Leverett function) was determined by centrifugation. The relative permeability of the liquid phase was obtained based on comparison between calculation results and experimental data. The effective diffusivity was analyzed based on the effects of diffusion and capillary action, its value depending very much on the permeability, temperature, and so on. Meanwhile, the calculation results revealed that there is a critical temperature for the transport process, when the temperature is lower than the critical value, with an increasing temperature being beneficial to mass transfer. Proper reduction of the diameter of yarn bobbins is a method to enhance the mass transport process.
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