Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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Effect of Intersection Angle of the Flow-focusing Type Droplet Generation Device Channel on Droplet Diameter by using Numerical Simulation Modeling

수치해석 모델링을 이용한 교차 흐름 미세유체 액적 생성 디바이스 채널 교차각이 액적 직경에 미치는 영향

  • Kim, Shang-Jin (Department of Pharmacology, College of Veterinary Medicine, Chonbuk National University) ;
  • Kang, Hyung-Sub (Department of Pharmacology, College of Veterinary Medicine, Chonbuk National University) ;
  • Yang, Yeong-Seok (Division of Pharmaceutical Engineering, Woosuk University) ;
  • Kim, Gi-Beum (Department of Pharmacology, College of Veterinary Medicine, Chonbuk National University)
  • 김상진 (전북대학교 수의과대학 약리학교실) ;
  • 강형섭 (전북대학교 수의과대학 약리학교실) ;
  • 양영석 (우석대학교 제약공학과) ;
  • 김기범 (전북대학교 수의과대학 약리학교실)
  • Received : 2015.05.28
  • Accepted : 2015.06.30
  • Published : 2015.06.30
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Abstract

In this paper, we studied the effects of intersection angles of the flow-foucusing type droplet generation device inlet channel on droplet diameter using numerical simulation modeling. We modeled different intersection angles with a fixed continuous channel width, dispersed channels width, orifices width, and expansion channels width. Numerical simulations were performed using COMSOL Multiphysics$^{(R)}$ to solve the incompressible Navier-Stokes equations for a two-phase flow in various flow-focusing geometries. Modeling results showed that an increase of the intersection angle causes an increase in the modification of the dispersed flow rate ($v^{\prime}{_d}$), and the increase of the modification of the continuous flow rate ($v^{\prime}{_c}$) obstructs the dispersed phase fluid flow, thereby reducing the droplet diameter. However, the droplet diameter did not decrease, even when the intersection angle increased. The droplet diameter decreased when the intersection angle was less than $90^{\circ}$, increased at an intersection angle of $90^{\circ}$, and decreased when the intersection angle was more than $90^{\circ}$. Furthermore, when the intermediate energy deceased, there was a decrease in the droplet diameter when the intersection angle increased. Therefore, variations in the droplet diameter can be used to change the intersection angle and fluid flow rate.

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References

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