Document Type : Regular Article

Authors

• Yaser Kazemi ¹
• Abdullah Irankhah ²

¹ Hydrogen and Fuel Cell Research Laboratory, Department of Chemical Engineering, Faculty of Engineering, University of Kashan, P. O. Box 87317-51167, Kashan, Iran

² Hydrogen and Fuel Cell Research Lab., Chemical Engineering Dep., Engineering Faculty, University of Kashan

Abstract

Most of the reactions that occur in microreactors take place on the surface, so it is important to keep the reactants close to the reactive wall. One effective technique in this field is single-phase hydrodynamic focusing. However, this method has a drawback: a high percentage of reactants penetrate into the sheath fluid. To address this issue, the concept of two-phase hydrodynamic focusing is introduced in this study. The main idea is to use a highly viscous sheath fluid to create a barrier against reactant penetration into the sheath flow. To demonstrate the effectiveness of this method, a 3D numerical simulation was performed with an irreversible second-order reaction. The results show that two-phase hydrodynamic focusing increases reaction rates, particularly in downstream regions where the Sherwood number can increase by several orders of magnitude with the use of a highly viscous sheath of liquid. Additionally, it was observed that the use of two-phase hydrodynamic focusing improves efficiency, which is defined as the ratio of solute in the sample flow to the total solute in each cross-section.

Keywords

• Microreactor
• Hydrodynamic Focusing
• Numerical Solution
• Multiphase Flow
• Mass Transport

Main Subjects

• Modeling and Simulation