Highly efficient and controllable micromixer through interactions of photothermal multivortices

Author:

Luo Fangjing1,Yang Jianxin2,Zhou Ruixue1,Li Yao3,Luan Tianyang1,Li Zongbao4ORCID,Wu Jiayin1,Shou Qian5,Xing Xiaobo1ORCID

Affiliation:

1. South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China

2. Department of Biomedical Engineering, Chinese University of Hong Kong, Hong Kong 999077, China

3. State Key Laboratory of Optics Information Physics and Technologies, School of Information and Optoelectronic Science and Engineering, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China

4. School of Material and Chemical Engineering, Tongren University, Guizhou 554300, China

5. Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, South China Normal University, Guangzhou 510631, China

Abstract

The efficient and homogeneous mixing of fluids is crucial for microfluidic applications, such as chemical reactions, biological analyses, and material synthesis. This study designs a novel micromixer for efficient and controllable mixing based on photothermal vortices, which are generated from an array of linear heat sources as excited by a laser. The mixing performance is theoretically investigated using a multiphysics-coupled system based on the finite element method. We reveal the interactions between vortices and the mixing mechanism of fluids. The vortices provide a stable strength and adjustment ability to disturb fluid interfaces and enhance the mixing efficiency. Additionally, the effects of the vertical distance between two waveguides, optical power, and inlet mean velocity on the mixing performance are explored. As a result, the calculated mixing efficiency is 99.89%, which could be regarded as an important reference of the micromixer with an excellent mixing performance. The purpose of this study is to provide a new method for rapid, efficient, and controllable mixing for a myriad of chemical research and biotechnological applications.

Funder

National Natural Science Foundation of China

Science and Technology Program of Guangzhou

Science and Technology Project of Guangdong Province

Key Project of Education Department of Guangdong Province

and Open Fund of Guangdong Provincial Key Laboratory of Information Photonics Technology

Publisher

AIP Publishing

Subject

Condensed Matter Physics,Fluid Flow and Transfer Processes,Mechanics of Materials,Computational Mechanics,Mechanical Engineering

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