Effects of flow control in drop formation in coflow and electro-coflow settings

We studied the formation of emulsion drops in a coflow setting using glass-based microfluidic devices. Our work was focused on how the flow control method used - controlled flow rate (using syringe pumps) or controlled pressure - affects the drop size, frequency of formation, and the transition from dripping to jetting regime. Conversely to what has been shown in flow-focusing in 2D PDMS devices, drops generated in a 3D coflow setup do not present change in size with the different flow control methods. Interestingly, the transition from dripping to jetting is extended for Weber numbers (associated to the inner liquid, We) larger than 1 for pressure control, whereas in flow rate control, dripping is constricted to We