RT Journal Article ID 6857baf560cca0f9 A1 Zhang, Dong A1 Meng, Zhuo A1 Sun, Yize T1 MASS TRANSPORT OF LIQUID AMMONIA IN FIBER MODIFICATION PROCESS JF Heat Transfer Research JO HTR YR 2019 FD 2019-10-29 VO 50 IS 18 SP 1749 OP 1766 K1 liquid ammonia K1 yarn bobbin K1 mass transport K1 permeability K1 capillary force AB 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. PB Begell House LK https://www.dl.begellhouse.com/journals/46784ef93dddff27,070d4e004eb90078,6857baf560cca0f9.html