We simulate numerically a novel method for dispensing, mixing and ejecting of picolitre liquid samples in a single step. The system consists of a free liquid film, suspended in a frame and positioned in front of a droplet dispenser. On impact, a picolitre droplet merges with the film, but due to its momentum, passes through and forms a droplet that separates on the other side and continues its flight. Through this process the liquid in the droplet and that in the film is mixed in a controlled way. We model the flow using the Navier-Stokes together with the Cahn-Hilliard equations. This system allows us to simulate the motion of a free surface in the presence of surface tension during merging, mixing and ejection of droplets. The influence of dispensing conditions was studied and it was found that the residual velocity of droplets after passage through the thin liquid film matches the measured velocity from the experiment well.
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ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels
June 23–25, 2008
Darmstadt, Germany
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4834-5
PROCEEDINGS PAPER
Numerical Simulation of the Passage of Small Liquid Droplets Through a Thin Liquid Film
Minh Do-Quang,
Minh Do-Quang
Royal Institute of Technology, Stockholm, Sweden
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Go¨ran Stemme,
Go¨ran Stemme
Royal Institute of Technology, Stockholm, Sweden
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Wouter van der Wijngaart,
Wouter van der Wijngaart
Royal Institute of Technology, Stockholm, Sweden
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Gustav Amberg
Gustav Amberg
Royal Institute of Technology, Stockholm, Sweden
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Minh Do-Quang
Royal Institute of Technology, Stockholm, Sweden
Go¨ran Stemme
Royal Institute of Technology, Stockholm, Sweden
Wouter van der Wijngaart
Royal Institute of Technology, Stockholm, Sweden
Gustav Amberg
Royal Institute of Technology, Stockholm, Sweden
Paper No:
ICNMM2008-62319, pp. 857-861; 5 pages
Published Online:
June 11, 2009
Citation
Do-Quang, M, Stemme, G, van der Wijngaart, W, & Amberg, G. "Numerical Simulation of the Passage of Small Liquid Droplets Through a Thin Liquid Film." Proceedings of the ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. Darmstadt, Germany. June 23–25, 2008. pp. 857-861. ASME. https://doi.org/10.1115/ICNMM2008-62319
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