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

Effect of Intersection Angle of the Flow-focusing Type Droplet Generation Device Channel on Droplet Diameter by using Numerical Simulation Modeling

양영석|김기범|강형섭|김상진
대한의용생체공학회 (The Korea Society Of Medical & Biological Engineering)|2015.06|의공학회지 (Journal of biomedical Engineering Research)|제36권 제3호|pp. 61-68|DOI http://dx.doi.org/10.9718/JBER.2015.36.3.61

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키워드

MicrofludicsDroplet generationIntersection angleLevel-set method modelingFlow-focusing device

초록

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® 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 ( ), and the increase of the modification of the continuous flow rate ( ) 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 90o, increased at an intersection angle of 90o, and decreased when the intersection angle was more than 90o. 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.

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® 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 ( ), and the increase of the modification of the continuous flow rate ( ) 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 90o, increased at an intersection angle of 90o, and decreased when the intersection angle was more than 90o. 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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