Solute diffusion in fruit, vegetable and cereal processing II: Simplified solution of continuous counter-current diffusion
1997
Chairat Siripatana | Neeranart Suparanont (Prince of Songkla Univ., Songkhla (Thailand). Faculty of Agro-Industry. Dept. of Industrial Biotechnology)
Application of diffusion theory in continuous counter-current diffusion (CCD) is simplified for simple shapes and extended for anomalous shapes. The concepts of j-factor and time delay were introduced. The simplified solution of diffusion equation was derived within practical ranges (0.1Biot number (Bi) infinity, 1 shape indes (v) 3, and 0.5 draft (alpha) infinity). Anomalous shapes were treated by ellipsoidal model and partially varified by solution of rectangular block and finite cylinder. The model was extended for the effect of axial dispersion. The concept of equivalent draft was developed and applied to estimated the Sherwood number affected by axial dispersion in both solid and liquid phases. Practical application of the solution to the actual CCD is demonstrated.
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