MANIPULATING SMALL DROPLETS IN MICROCHANNELS WITH COMPLEX FLUIDS - - PowerPoint PPT Presentation
JUNE 5, 2019 MANIPULATING SMALL DROPLETS IN MICROCHANNELS WITH COMPLEX FLUIDS Blue Waters Symposium 2019 MICHAEL P . HOWARD The University of Texas at Austin I use Blue Waters to engineer complex fluids and soft materials at the nanoscale.
MICHAEL P . HOWARD The University of Texas at Austin JUNE 5, 2019
Blue Waters Symposium 2019 I use Blue Waters to engineer complex fluids and soft materials at the nanoscale.
2 Di Carlo et al., PNAS 104, 18892 (2007).
3
4
100
η / ηs (a) κ=0
4×100
ρ=0.025 ρ=0.050 ρ=0.100
10 10-5 10-4 10-3 10-2
γ .
5
D'Avino et al., Lab Chip 12, 1638 (2012). ß distance down channel
6 Prohm et al., Eur. Phys. J. E 35, 80 (2012).
Kim et al., Lab Chip 12, 2807 (2012).
7
8
9
M.P. Howard et al., J. Chem. Phys. 142, 224908 (2015).
10
11
12 M.P. Howard et al., Soft Matter 15, 3168 (2019).
2 4 6
no polymer
fx [ε/d]
0.001 0.002 0.003 0.004 0.005
0.0 0.2 0.4 0.6 0.8 1.0
13 0.0 0.2 0.4 0.6
⟨D⟩
fx [ε/d]
(a)
0.001 0.002 0.003 0.004 0.005
M.P. Howard et al., Soft Matter 15, 3168 (2019).
Ca
0.0 0.1 0.2 0.3 20 30 40
⟨θ⟩ [◦] (b)
14
0.0 0.2 0.4 0.6 0.8 1.0
|zc|/H
2 4 6 8
probability
no polymer φp = 2.5% φp = 5.0% φp = 7.5% φp = 10.0% 0.5 0.7 0.9 1 2
M.P. Howard et al., Soft Matter 15, 3168 (2019).
. −1.0 −0.5 0.0 0.5 1.0
z/H
0.0 0.5 1.0 1.5
ux [d/τ] (b)
no polymer φp = 2.5% φp = 5.0% φp = 7.5% φp = 10.0%
τ ∼ ✓∂ux ∂z ◆n
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M.P. Howard et al., Soft Matter 15, 3168 (2019).