A Procedure for the Motion of Particle-Encapsulated Droplets in Microchannels

Y. F. Yap, J. C. Chai, T. N. Wong, N. T. Nguyen, K. C. Toh, H. Y. Zhang, L. Yobas

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5 Citations (Scopus)

Abstract

A fixed-grid approach for modeling the motion of a particle-encapsulated droplet carried by a pressure-driven immiscible carrier fluid in a microchannel is presented. Three phases (the carrier fluid, the droplet, and the particle) and two different moving boundaries (the droplet-carrier fluid and droplet-particle interfaces) are involved. This is a moving-boundaries problem with the motion of the three phases strongly coupled. In the present article, the particle is assumed to be a fluid of high viscosity and constrained to move with rigid body motion. A combined formulation using one set of governing equations to treat the three phases is employed. The droplet-carrier fluid interface is represented and evolved using a level-set method with a mass-correction scheme. Surface tension is modeled using the continuum surface force model. An additional signed distance function is employed to define the droplet-particle interface. Its evolution is determined from the particle motion governed by the Newton-Euler equations. The governing equations are solved numerically using a finite-volume method on a fixed Cartesian grid. For demonstration purposes, the flows of particle-encapsulated droplets through a constricted microchannel and through a microchannel system are presented.

Original languageEnglish
Pages (from-to)59-74
Number of pages16
JournalNumerical Heat Transfer, Part B: Fundamentals
Volume53
Issue number1
Early online date6 Nov 2007
DOIs
Publication statusPublished - Jan 2008
Externally publishedYes

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    Yap, Y. F., Chai, J. C., Wong, T. N., Nguyen, N. T., Toh, K. C., Zhang, H. Y., & Yobas, L. (2008). A Procedure for the Motion of Particle-Encapsulated Droplets in Microchannels. Numerical Heat Transfer, Part B: Fundamentals, 53(1), 59-74. https://doi.org/10.1080/10407790701632485