Modelling of constant pressure expression of homogeneous semi-solid material

• Main Authors: Jami, Mohammed Saedi, Iwata, Masashi
• Format: Conference or Workshop Item
• Language: English; English
• Published: 2020
• Subjects: TP Chemical technology; TP155 Chemical engineering; TS Manufactures
• Online Access: http://irep.iium.edu.my/86563/1/86563_MODELLING%20OF%20CONSTANT%20PRESSURE%20EXPRESSION-Abstract.pdf; http://irep.iium.edu.my/86563/2/86563_MODELLING%20OF%20CONSTANT%20PRESSURE%20EXPRESSION-Poster.pdf; http://irep.iium.edu.my/86563/; https://www.iium.edu.my/kulliyyah/koe/kerice-2020

Mechanical expression is the separation of liquid from a two-phase solid/liquid system by compression due to movement of a retaining wall rather than pumping the solid/liquid system into a fixed chamber as in filtration. In this study, the basic consolidation equation was derived by combining the fundamental equation for power law non-Newtonian flow through the cake with the equation of continuity and solved numerically using the Runge–Kutta method. As a model solid/liquid mixture, cellulose powder mixed with an aqueous solution of sodium polyacrylate was used. The mixture was preconsolidated under a constant pressure ps1, resulting in a homogeneous cake of thickness L1. Then it was expressed under a constant pressure p. The time course of the thickness L of the sample was measured. L∞ is the final thickness of the compressed cake. The agreement between calculated and experimental Uc was satisfactory when the creep effect was considered.