Effect of hydrodynamic heterogeneity on micromixing intensification in a Taylor–Couette flow reactor with variable configurations of inner cylinder

Abstract

Effect of hydrodynamic heterogeneity on micromixing intensification in a Taylor-Couette flow (TC) reactor with variable configurations of inner cylinder has been investigated by adoption of a parallel competing iodide-iodate reaction system. Two types of inner cylinder, circular inner cylinder and lobed inner cylinder (CTC and LTC), were used to generate hydrodynamic heterogeneity, focusing on the effects of the Reynolds number, the acid concentration, and the feeding time on the micromixing performance. Segregation index (Xs) was employed to evaluate the micromixing efficiency. It is revealed that Xs decreases with the increase of Reynolds number and feeding time but increases with the increase of acid concentration for both the CTC and LTC. However, the LTC does present a better micromixing performance at various operating conditions than that of the CTC as affirmed by both the experimental and computational fluid dynamics simulation results.

Synthesis of Micro-/Nanohydroxyapatite Assisted by the Taylor–Couette Flow Reactor

“…20 When the inner cylinder rotates at a certain speed, Taylor vortex flow will appear in the gap, and the impact jet area formed between the opposite rotating ring Taylor vortex enhances the mass transfer and facilitates mixing. 21 24 The excellent mixing and periodic flow of the Taylor vortex promote the formation of spherical, homogeneous agglomerated particles. Kim et al 25 investigated the effect of the Taylor vortex on the crystallization process of the gas− liquid reaction of calcium carbonate and found that the Taylor vortex enhanced the mass transfer at the gas−liquid interface, thus increasing the crystallization yield.…”

“…The inner cylinder rotates while the outer cylinder is fixed, and the inner and outer cylinder gap is the reaction site . When the inner cylinder rotates at a certain speed, Taylor vortex flow will appear in the gap, and the impact jet area formed between the opposite rotating ring Taylor vortex enhances the mass transfer and facilitates mixing . The simple structure and flexible operation have facilitated Taylor–Couette flow reactors’ experimental and industrial development.…”

“… 20 When the inner cylinder rotates at a certain speed, Taylor vortex flow will appear in the gap, and the impact jet area formed between the opposite rotating ring Taylor vortex enhances the mass transfer and facilitates mixing. 21 The simple structure and flexible operation have facilitated Taylor–Couette flow reactors’ experimental and industrial development. Recently, many researchers have focused their interest on mixing enhancement in Taylor–Couette flow reactors.…”

Evaluation on Micromixing of a Continuous Solid Particle Flow in In-Line HSMs by Experiments and Artificial Intelligence Approaches

“…In the past decades, fluid mixing as a common and basic unit operation has been widely developed and applied in various industrial fields, including the chemical, petroleum, pharmaceutical, and food industries. , It can be distinguished into three distinct levels as macromixing, mesomixing, and micromixing based on the space/time scale of mixing. , Specifically, the micromixing occurring at the molecular scale plays an essential role in the fast chemical reaction, as polymerization reactions, catalytic reactions, , and precipitation reactions. , The micromixing performance of reactors and the inherent reaction kinetics of the reaction determine the conversion and selectivity of reactants and the quality and yield of products. , Many scholars have studied the micromixing performance of reactors including stirred reactors, , microchannel reactors, , rotating packed-bed (RPB) reactors, , rotor–stator spinning disk reactors, , impinging jet reactors, and high-shear mixers (HSM) . For example, Liu et al investigated the micromixing characteristics of the novel large-double-blade stirring reactor and indicated that the micromixing performance was improved by increasing the feeding time and feeding in the high-local energy dissipation rate regions.…”

“…3,4 Specifically, the micromixing occurring at the molecular scale plays an essential role in the fast chemical reaction, 5 as polymerization reactions, 6 catalytic reactions, 7,8 and precipitation reactions. 9,10 The micromixing performance of reactors and the inherent reaction kinetics of the reaction determine the conversion and selectivity of reactants and the quality and yield of products. 11,12 Many scholars have studied the micromixing performance of reactors including stirred reactors, 13,14 microchannel reactors, 15,16 rotating packed-bed (RPB) reactors, 17,18 rotor−stator spinning disk reactors, 19,20 impinging jet reactors, 21 and high-shear mixers (HSM).…”