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. 2016 Jun 3;6:26953. doi: 10.1038/srep26953

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(a) Droplet length, D, as a function of the flow rate of inner (oil) phase, q_in, for different flow ratios between the inner (oil) to outer (water) flow rate in an unmodified, hydrophilic capillary: ϕ = 1/3 (▲), ϕ = 1 (), ϕ = 3 (), ϕ = 7 (). (b) Effect of flow ratio on the dimensionless droplet length D, normalized with the capillary diameter, d. The dashed line is the best fit of the power-law relation: D/d ~ ϕ^10/9.

Inline graphic — (a) Droplet length, D, as a function of the flow rate of inner (oil) phase, q_in, for different flow ratios between the inner (oil) to outer (water) flow rate in an unmodified, hydrophilic capillary: ϕ = 1/3 (▲), ϕ = 1 (), ϕ = 3 (), ϕ = 7 (). (b) Effect of flow ratio on the dimensionless droplet length D, normalized with the capillary diameter, d. The dashed line is the best fit of the power-law relation: D/d ~ ϕ^10/9.