SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 39 ›› Issue (11): 51-58.DOI: 10.1016/j.cjche.2021.04.030

• Fluid Dynamics and Transport Phenomena • Previous Articles     Next Articles

Experimental investigation of dynamic mass transfer during droplet formation using micro-LIF in a coaxial microchannel

Zhuo Chen1, Qiqiang Xiong1, Shaowei Li2, Yundong Wang1, Jianhong Xu1   

  1. 1 The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;
    2 Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
  • Received:2020-12-09 Revised:2021-03-12 Online:2021-12-27 Published:2021-11-28
  • Contact: Yundong Wang, Jianhong Xu
  • Supported by:
    The authors gratefully acknowledge the supports of the National Natural Science Foundation of China (21991100, 21991101) for this work.

Experimental investigation of dynamic mass transfer during droplet formation using micro-LIF in a coaxial microchannel

Zhuo Chen1, Qiqiang Xiong1, Shaowei Li2, Yundong Wang1, Jianhong Xu1   

  1. 1 The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;
    2 Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
  • 通讯作者: Yundong Wang, Jianhong Xu
  • 基金资助:
    The authors gratefully acknowledge the supports of the National Natural Science Foundation of China (21991100, 21991101) for this work.

Abstract: The mass transfer of Rhodamine 6G from the droplet to the continuous phase in a coaxial micro-channel is studied using micro-LIF (Laser-Induced Fluorescence). The mass distribution inside droplet is measured and visualized. The experimental results affirm that there exists the internal circulation inside the droplet and it could enhance the convective mass transfer. The stagnant center of vortices is also observed. The extraction fraction could reach 40%-80%. In order to establish the mass transfer model, different flow rates of the dispersed and continuous phase are adopted. The high continuous phase flow rate and low dispersed phase flow rate are both beneficial to enhance mass transfer by expediting the internal circulation. A modified mass transfer model is found to calculate the extraction fraction. A good agreement between the model and experiment in various conditions demonstrates that the mass transfer model in this work is reliable and feasible.

Key words: Droplet formation, Micro-LIF measurement, Internal circulation, Mass transfer model

摘要: The mass transfer of Rhodamine 6G from the droplet to the continuous phase in a coaxial micro-channel is studied using micro-LIF (Laser-Induced Fluorescence). The mass distribution inside droplet is measured and visualized. The experimental results affirm that there exists the internal circulation inside the droplet and it could enhance the convective mass transfer. The stagnant center of vortices is also observed. The extraction fraction could reach 40%-80%. In order to establish the mass transfer model, different flow rates of the dispersed and continuous phase are adopted. The high continuous phase flow rate and low dispersed phase flow rate are both beneficial to enhance mass transfer by expediting the internal circulation. A modified mass transfer model is found to calculate the extraction fraction. A good agreement between the model and experiment in various conditions demonstrates that the mass transfer model in this work is reliable and feasible.

关键词: Droplet formation, Micro-LIF measurement, Internal circulation, Mass transfer model