Jump to Main Content
Apparent diffusion model assessment in extraction processes by means of a Luenberger observer
- Martínez-Vera, C., Ruiz-Martínez, R.S., Vizcarra-Mendoza, M.G., Álvarez-Calderón, J.
- Journal of food engineering 2010 v.101 no.1 pp. 16-22
- diffusion, extraction, simulation models, chemical concentration, tung oil, seeds, seed extracts, estimation, model food systems
- In this work a clear methodology is proposed that allows the estimation of diffusion-concentration functional relationship in extraction processes, which are modelled by Fick's second law. A criterion is proposed for deciding when the diffusivity should be considered a constant value (comparable to those obtained by the standard regression technique) and when a function depending on concentration. The methodology is based in a Luenberger observer. The diffusion-concentration relationship is refined by an optimization procedure making use of a numerical solution of the diffusion equation. The robustness of the methodology is assessed by a noise propagation analysis. The methodology is illustrated for oil extraction from tung seeds with experimental data taken from the literature.