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Heat Transfer Research
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ISSN Imprimir: 1064-2285
ISSN En Línea: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2019028615
pages 1749-1766

MASS TRANSPORT OF LIQUID AMMONIA IN FIBER MODIFICATION PROCESS

Dong Zhang
College of Mechanical Engineering, Donghua University, Shanghai 201620, China
Zhuo Meng
College of Mechanical Engineering, Donghua University, Shanghai 201620, China
Yize Sun
College of Mechanical Engineering, Donghua University, Shanghai 201620, China

SINOPSIS

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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