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Modeling the Release of Urea from Coated Urea: The Constant Release Stage

Trinh, Thanh and Ku Shaari, Ku Zilati and Shuib, Anis and Ismail, Lukman and Basit, Abdul and Azeem, Babar (2013) Modeling the Release of Urea from Coated Urea: The Constant Release Stage. In: International Conference on the Science and Engineering of Materials 2013 (ICoSEM2013), 13-14th November 2013, Kuala Lumpur.

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Official URL: http://umconference.um.edu.my/ICoSEM

Abstract

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.

Item Type:Conference or Workshop Item (Paper)
Subjects:T Technology > TP Chemical technology
Academic Subject One:Academic Department - Chemical Engineering - Process System Engineering
Departments / MOR / COE:Departments > Chemical Engineering
Research Institutes > Energy
Research Institutes > Institute for Health Analytics
ID Code:10946
Deposited By: Anis Shuib
Deposited On:16 Dec 2013 23:47
Last Modified:16 Dec 2013 23:47

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