Abstract
The objective of this paper is to characterize the hydrodynamic and thermal behaviors of yield stress fluids within a cylindrical agitated vessel equipped with simple helical ribbon stirrers (SHR) (one and two-stages) by means of the numerical simulation approach. For this purpose, a computational fluid dynamic simulation using the 3D finite volume technique has been carried out to solve the continuity, momentum and thermal energy equations. In this study, we have analyzed the Oldroyd and Reynolds numbers effects on the hydrodynamic and thermal behaviors for the two mentioned stirrers types. In addition, the influence of the impeller width and its clearance from the vessel wall on the velocity and thermal fields has been investigated. Velocity and thermal fields’ visualization has been presented in different (r–z) and (r–θ) planes. Moreover, the power constant and Nusselt number are correlated by a relationship relating the physical properties and the geometric ratios defining the SHR.
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