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

Autor: Takayuki Shimo, Masashi Iwata, Takanori Tanaka, Mohammed Saedi Jami
Rok vydání: 2019
Předmět:
Zdroj: Journal of the Taiwan Institute of Chemical Engineers. 94:37-42
ISSN: 1876-1070
DOI: 10.1016/j.jtice.2018.03.011
Popis: 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 ω0, 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 η, a measure of the rate of creep deformation, both were found to be ω0-independent parameters, supporting the validity of the assumption made in the theoretical derivation.
Databáze: OpenAIRE
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