MODELING LIQUID WATER ABSORPTION OF UNTREATED UKAM FIBER DURING SOAKING
Publication Date : 01/03/2017
The research addresses the hydrophilic behaviors of the natural ukam plant fiber material at various studied conditions. The aim of this work was to reveal the possibilities to model the liquid water absorption characteristics of untreated ukam fiber which assists in optimizing soaking conditions. Liquid water absorption of untreated ukam fiber during soaking in liquid water at temperatures of 10, 20, 30, 40,50oC was simulated using peleg’s model. The weight-gain during soaking process was determined in terms of moisture content. Peleg’s equation was adequately capable to predict water uptake of untreated ukam fiber under the experimental conditions. The peleg rate constant, k1, decreased from 102.00*10-2 to 44.87*102 h% -1 while capacity constant, k2, did not with increasing temperature. The effective diffusivity was evaluated by fitting experimental absorption data to Fick’s second law of diffusion. Effective diffusivity of water varied from 4.2432*10 -9 to 0.8486*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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