A study of transition from periodic dripping to jetting in the presence of an electric field

Integrated silicon microfluidic chip for picoliter-scale analyte segmentation and microscale printing for mass spectrometry imaging

“…4A). It has been shown 39 that the transition from dripping to spindle and jetting modes occurs at the critical Weber number, We = ρv 2 2r/γ, that depends on the flow velocity v. Widening the channel radius from 7 μm (design in Fig. 2D and 4) to 12 μm (design in Fig.…”

“…2A–C ) will decrease the flow velocity (hence the critical Weber number) as much as 5-fold. 39 Therefore, at the same flow rate, by increasing the channel radius, the boundary from micro-dripping to jetting regimes will be pushed to higher voltages, so that smaller droplets could be printed.…”