| Outline of Annual Research Achievements |
As planned in the proposal, I developed an integrated microfluidic platform for instantaneous flow and localized temperature control in FY2017. The platform consisted of a flow-focusing region for emulsion droplet production, a cross junction region embedded with a microheater for droplet trapping and localized temperature control by using an active feedback control system. Our integrated platform offers the capability of manipulating non-contact, instantaneous flow with precise temperature control, which provides valuable tools for studying transient interfacial dynamics. These results led to a publication (1). By using this platform with minor modifications, we are also able to complete 2 related (but not listed in the original proposal) projects, which led to a total 4 publications (see below) during FY2017.
[1] Doojin Lee, Cifeng Fang, Aniket S. Ravan, G.G. Fuller, A.Q. Shen, Temperature controlled tensiometry using droplet microfluidics, Lab on a Chip, 2017, 17, 717-726. [2] Francesco Del Giudice, Shivani Sathish, Gaetano D’Avino, Amy Q. Shen, From the edge to the center: viscoelastic migration of particles and cells in a strongly shear-thinning liquid flowing in a microchannel, Analytical Chemistry, 2017, 19;89(24):13146-13159. [3] Noa Burshtein, Konstantinos Zografos, Amy Q. Shen, Robert J. Poole, and Simon J. Haward, Inertioelastic flow instability at a stagnation point, Physical Review X, 2017, 7, 041039-18. [4] Simon J. Haward, Amy Q. Shen, Jacob Page, Tamer A. Zaki, Poiseuille flow over a wavy surface, Physical Review Fluids, 2017, 2, 124102.
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| Strategy for Future Research Activity |
Since I am ahead of schedule from my original proposed research, I would like to add 1 additional project for FY2018, that is closely related to the original Kakenhi research.
I will employ a state-of-the-art microfabrication technique (selective laser-induced etching, SLE) to produce microfluidic cylinder geometries that explore new geometrical regimes. Using flow velocimetry and quantitative birefringence measurement techniques we will study the flow behavior of a well-characterized viscoelastic polymer solution around the cylinders. The results will be of relevance to understanding practical applications of viscoelastic fluids, for example in porous media flows, and also for benchmarking against numerical simulations using viscoelastic constitutive models.
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