Constant pressure expression of power law non-Newtonian fluid/solid mixture

• Main Authors: Iwata, Masashi, Shimo, Takayuki, Tanaka, Takanori, Jami, Mohammed Saedi
• Format: Article
• Language: English; English; English
• Published: Elsevier 2019
• Subjects: TP155 Chemical engineering
• Online Access: http://irep.iium.edu.my/69549/7/69549%20Constant%20pressure%20expression%20of%20power%20law.pdf; http://irep.iium.edu.my/69549/8/69549%20Constant%20pressure%20expression%20of%20power%20law%20SCOPUS.pdf; http://irep.iium.edu.my/69549/19/69549_Constant%20pressure%20expression%20of%20power_WOS.pdf; http://irep.iium.edu.my/69549/; https://www.sciencedirect.com/science/article/pii/S1876107018301494
• Institution: Universiti Islam Antarabangsa Malaysia

Expression of non-Newtonian fluid/solid mixture is often encountered in the fields of polymer and food industries. However, a reliable method for the design of the expression process has not been established. In this study, we conducted expression experiments of power law non-Newtonian fluid/solid mixture under constant pressure condition. 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. The progress of the expression is represented by an average consolidation ratio Uc. The agreement between calculated and experimental Uc was satisfactory when the creep deformation of the material was taken into consideration. It was also elucidated that the consolidation time required for attaining a certain degree of primary consolidation depends on the (N+1)/N-th power of the total volume of the solid material omega_0, where N is the flow behavior index of the squeezed liquid. On the other hand, the creep constants B, the ratio of creep deformation to the total deformation, and eta, a measure of the rate of creep deformation, both were found to be omega_0-independent parameters, supporting the validity of the assumption made in the theoretical derivation.