Abstract—In the effort of getting a better understanding on urea release mechanism, a multi-diffusion model is used to simulate the diffusion of urea through coating layer and to environment. Based on the multi-diffusion model for "constant release" stage, the effect of particle size (
R0) and coating thickness (
l) on diffusive flux, release rate and release time are investigated by using Finite Element Method (FEM) and 2D-geometry. Results show that an increase in particle size or coating thickness also leads to an increase in release time. However, adjusting on particle size is more economical than coating thickness. In addition, there is no relationship between the product
R0 × l with the diffusive flux or release rate. A linear relationship between the product
R0 2 ×
l-1 and release rate has been found instead.
Index Terms—Urea Release, urea diffusion, finite element method, multi-diffusion modeling.
T. H. Thanh, K. Ku Shaari, A. Basit and B. Azeem are with the Universiti Teknologi PETRONAS, Tronoh, Perak 31750 Malaysia (e-mail: onalone2000@gmail.com; kuzilati_kushaari@petronas.com.my; abdulbasit135@gmail.com; engrbabara@gmail.com).
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Cite: Thanh H. Trinh, Ku Zilati Ku Shaari, Abdul Basit, and Babar Azeem, "Effect of Particle Size and Coating Thickness on the Release of Urea Using Multi-Diffusion Model," International Journal of Chemical Engineering and Applications vol. 5, no. 1, pp. 58-63, 2014.
