Experimental Study of Reactive Mixing in a Laminar Flow Batch Reactor

CFD Investigation of the Mixing of Yield‐Pseudoplastic Fluids with Anchor Impellers

“…For instance, in polymerization reactors, it is desirable to ensure efficient mixing to prevent phenomena like hot spots, to control the molecular weight distribution of the final product, and to avoid the dead zones. It is believed that the large-diameter close-clearance impellers, such as helical-ribbon and anchor impellers, give rise to good mixing in the entire mixing vessels for such applications [7,8]. In laminar mixing of highly viscous fluids, the mixing is obtained by a sequence of stretching, folding and breaking mechanisms and not by highly energetic eddies, which makes the design of an optimal mixing device very challenging [9].…”

Using CFD to understand chaotic mixing in laminar stirred tanks

“…Unfortunately, quantitative methods to describe mixing in stirred tanks have been generally limited to bulk measures such as using neutralization experiments to visually deter-Ž mine mixing time Hayes et al, 1998;Norwood and Metzner, . 1960 , or measuring mixing times based on the variance of the pH, conductivity, or concentration recorded by a small Correspondence concerning this article should be addressed to F. J.…”

Assessment of Mixing Performance and Power Consumption of a Novel Polymerization Reactor System

“…In a recent study, Hayes et al [12] investigated mixing in a vessel using a single helical ribbon impeller with CV as tracer dye in solutions of poly(ethylene glycol) in water. Rather than sampling the liquid, they used a spectrophotometric probe to continuously monitor concentration changes.…”

“…Various experimental methods for measuring mixing times have been reviewed [10±13]. Several studies of mixing of viscous (10 to 80 Pa s) fluids using helical ribbon and/or helical screw impellers have been performed using the dye addition method, where a colored tracer is added to the vessel, and the time required for dispersion of the tracer throughout the vessel is determined visually [14±17] or using visible spectrophotometry [12]. Mixing times three to six times shorter than those obtained with analytical methods are typically obtained using the visual method, which has been criticized because of its subjective nature [10].…”