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Drop motion, deformation, and cyclic motion in a non-uniform electric field in the viscous limit
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10.1063/1.4813236
/content/aip/journal/pof2/25/7/10.1063/1.4813236
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/7/10.1063/1.4813236
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Experimental setup to study drop-behavior in non-uniform fields.

Image of FIG. 2.
FIG. 2.

Snapshots of deformation and motion of an uncharged drop in non-uniform electric field.

Image of FIG. 3.
FIG. 3.

Motion and deformation of an uncharged drop. (a) Dashed lines with symbols are experimental results while continuous lines are model predictions. Applied potential at pin-electrode, = 400 V (• ), 500 V (■), 600 V (✦), 700 V (★), and 800 V (▲). Drop radius, = 250 μm and electrodes separation, d = 2.6 mm. (b) Drop shapes corresponding to points in Fig. 3(a).

Image of FIG. 4.
FIG. 4.

Effect of applied potential on uncharged drop's deformation. (a) Comparison with Feng's model and (b) collapsed data. Experimental values (symbols) and Feng's model predictions (—). = 400 V (▲, a), 500 V (▼, b), 600 V (★, c), 700 V (✦, d), 800 V (■, e) and 900 V (•, ). Drop radius = 250 μm and electrodes separation, = 2.6 mm.

Image of FIG. 5.
FIG. 5.

Relative contribution of the quadrupole and the uniform fields to the degree of deformation. = 400 V (a), 500 V (b), 600 V (c), 700 V (d), 800 V (e), and 900 V (f). Drop radius = 250 μm and electrodes separation, = 2.6 mm.

Image of FIG. 6.
FIG. 6.

Asymmetric degree of deformation of an uncharged drop in non-uniform electric field. (a) Experimentally observed asymmetric degree of deformation. = 400 V (▲), 500 V (▼), 600 V (★), 700 V (✦), and 800 V (■). Drop radius, = 250  μm and electrodes separation, = 2.6 mm. (b) Comparison with Feng's model predictions (—).

Image of FIG. 7.
FIG. 7.

Variation of degree of deformation with drop size. (a) Experimentally observed DD (dashed lines with symbols) and DD by Feng's model (—). = 200 μm (✦, a), 275 μm (■, b), and 425 μm (•, c). Applied potential, = 600 V and electrodes spacing, = 2.6 mm. (b) scaled with drop radius, and (c) DD scaled with .

Image of FIG. 8.
FIG. 8.

Dielectrophoretic cyclic motion of a drop. (a) Near-electrode cyclic motion. = 250 μm, = 2.6 mm, and V = 400 V. Charge = 12.5 × 10 C is used to match theoretical (—) and experimental (•) cyclic motion. (b) Electrode-electrode cyclic motion. = 335 μm, = 2.5 mm and = 940 V. Charge acquired at pin electrode = 52.1 × 10 C and at plate electrode = /15 is used to match theoretical (—) and experimental (•) frequency of cyclic motion.

Image of FIG. 9.
FIG. 9.

Normalized charge (/ ) at the pin electrode as a function of the normalized potential (/ ) for a single size drop.

Image of FIG. 10.
FIG. 10.

Effect of applied potential on cyclic motion frequency. (a) Near-electrode cyclic motion frequency. = 250 μm, = 2.6 mm. (b) Electrode-electrode cyclic motion frequency. = 335 μm, = 2.5 mm.

Image of FIG. 11.
FIG. 11.

Near-electrode cyclic motion frequency (■) and charge acquired at pin electrode (•) by drops of different sizes. 600 V is applied across 2.6 mm.

Image of FIG. 12.
FIG. 12.

LD-LD system, positive dielectrophoresis: Castor oil drop, surrounded by silicone oil, disintegrating on pin electrode. V = 900 V and = 2.6 mm.

Image of FIG. 13.
FIG. 13.

Degree of deformation of an uncharged drop in LD-LD, negative dielectrophoretic system. (a) V = 500 V (▼, a), 1 kV (■, b), 1.5 kV (★, c), 2.0 kV (•, d), 2.5 kV (✦, e), and 3.0 kV (▲, f). Experimental values (symbols) and Feng's model predictions (—). Drop radius, = 325 μm and electrodes separation, = 2.6 mm. (b) Data replotted with DD/ .

Image of FIG. 14.
FIG. 14.

plots for pin-plate electrode system. (a) Typical potential plot and (b) typical electric field plot. Potential at pin electrode, V = 800 V and electrodes spacing, d = 2.6 mm. (c) Λ, and (d) at different z-positions. drop radius, a = 200 μm (a), 275 μm (b), and 425 μm (c).

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/content/aip/journal/pof2/25/7/10.1063/1.4813236
2013-07-15
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Drop motion, deformation, and cyclic motion in a non-uniform electric field in the viscous limit
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/7/10.1063/1.4813236
10.1063/1.4813236
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