%0 Journal Article
%@ 10226680
%A Trinh, T.H.
%A KuShaari, K.
%A Shuib, A.S.
%A Bin Ismail, L.
%A Basit, A.
%A Azeem, B.
%C Kuala Lumpur
%D 2014
%F scholars:5138
%I Trans Tech Publications Ltd
%J Advanced Materials Research
%K Coatings; Diffusion; Finite element method; Latexes; Thickness measurement; Urea, Coating material; Coating thickness; Comsol multiphysics; Constant release; Controlled-release fertilizers; Effective diffusivities; Release profiles; Standard errors, Metabolism
%P 166-171
%R 10.4028/www.scientific.net/AMR.970.166
%T Modeling the release of urea from coated urea: The constant release stage
%U https://khub.utp.edu.my/scholars/5138/
%V 970
%X Controlled release fertilizer (CRF) plays an important role in nutrient loss prevention by plants and its utilization enhancement. This study uses multi-diffusion model to simulate the release of urea for two coating materials: modified polyolefin (MPO) and latex film, based on COMSOL Multiphysics software. Effective diffusivity and lag time (t0) are determined based on experimental data. Modeling results well simulate the experimental data of "constant release" stage. Standard error of estimate (SEE) ranges from 0.012 - 0.017 for MPO and 0.0316 for Latex film. The validated model is then utilized to study the effect of coating thickness (l), saturated urea concentration (Csat) and effective diffusivity (De) on the urea release profile. Release time increase with increasing coating thickness or decreasing saturated urea concentration, effective diffusivity. In addition, a change in effective diffusivity does not make significant change in percentage of urea at the end of "constant release" stage. © (2014) Trans Tech Publications, Switzerland.
%Z cited By 2; Conference of 1st International Conference on Science and Engineering of Materials, ICoSEM 2013 ; Conference Date: 13 November 2013 Through 14 November 2013; Conference Code:106246