CFD simulations and experimental validation of homogenisation curves and mixing time in stirred Newtonian and pseudoplastic liquids

Calculation of Metzner Constant for Double Helical Ribbon Impeller by Computational Fluid Dynamic Method

“…In some literature [15,31], the effective shear rate and the effective viscosity are also referred to as the average shear rate and the average viscosity, respectively. Therefore, the effective viscosity and the effective shear rate, to some extent, are close to the average viscosity and the average shear rate in the entire stirred tank during the mixing process.…”

Using CFD and Ultrasonic velocimetry to Study the Mixing of Pseudoplastic Fluids with a Helical Ribbon Impeller

“…The use of numerical simulations to investigate mixing dynamics and/or analyze a mixing operation is well established [13]. The fact that it provides an efficient and cost effective avenue to study details of the flow field generated by the impeller are some of the reasons for its growing popularity in mixing system design [14][15][16]. For instance, Shekhar and Jayanti [14] used computational fluid dynamics (CFD) to calculate the flow field generated by helical ribbon impellers in Newtonian and power law fluids, and concluded that the proportionality constant of the Metzner and Otto correlation [17] was independent of the fluid rheology, as represented by the flow behavior index, but strongly dependent on the clearance ratio.…”

CFD modeling of pilot-scale pump-mixer: Single-phase head and power characteristics

“…The two regions are implicitly coupled at the interface via a SM algorithm which takes into account the relative motion between the two regions and performs required interpolation. Advances in computing hardware have, for all practical purpose, overcome the time inefficiencies associated with transient simulations and consequently SM technique has emerged as the most widely used and validated approach to model flow in agitated tanks (Yeoh et al, 2004;Aubin et al, 2004;Montante et al, 2005;Li et al, 2005). In fact, research on agitated vessels seems to be shifting focus from impeller-baffle interaction modeling to application of more advanced turbulence models within the framework of SM approach.…”

“…However, advances in powerful numerical simulation tools like computational fluid dynamics (CFD) coupled with improvement in computing hardware have enabled us to gradually move from empirical to knowledge-based design. Going by the literature published in the recent past, CFD has been extensively used to model mechanically agitated vessels (Aubin et al, 2004;Yeoh et al, 2004;Montante et al, 2005;Li et al, 2005). However, most of these studies are focused on batch operations and CFD studies on continuous mixers, especially on head characteristics of pumping impellers, are difficult to come across.…”