MODELING LIQUID WATER ABSORPTION OF UNTREATED RAMIE FIBER DURING SOAKING

Onukwuli O.D., Okoronkwo G.O., Uyaelumuo A.E.

Abstract


Liquid water absorption of untreated ramie fiber during soaking in liquid water at temperatures of 10, 20, 30, 40,50oC was simulated using pelegs model. The weight-gain during soaking process was determined in terms of moisture content. Pelegs equation was adequately capable to predict water uptake of untreated ramie fiber under the experimental conditions. The peleg rate constant, k1, decreased from 32.53*10-2 to 9.59*10-2h%-1 while capacity constant, k2, did not with increasing temperature. The effective diffusivity was evaluated by fitting experimental absorption data to Ficks second law of diffusion. Effective diffusivity of water varied from 9.5471*10-9 to 1.9094*10-9 over the temperature range studied with an energy activation of 29,323.478KJmol-1K-1.The temperature dependence of the diffusivity coefficient was described satisfactorily by Arrhenius-type relationship.


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