Abstract
The formation of water-in-oil (W/O) emulsion droplets in a microfluidic flow-focusing device was investigated under the wide selection of operating parameters together with liquid materials. This is not only to demonstrate the obtained flow regimes and droplet outcomes but also to propose a predictive correlation among droplet size and operating dimensionless numbers. Data were collected from two etched channels of 100 and 190 µm depth. Experimental results of 12 data sets from over 100 experiments in two different-sized channels were assessed. Under the certain range of studied conditions, the stable narrowing jet and tip streaming regime noticeably created monodisperse droplet formation with high throughput. In addition, droplet size and junction size have been found to correlate with the flow rate ratio (Qc/Qd), viscosity ratio (µc/µd) and capillary number (Ca) following the correlation equation proposed in this work. This correlation will be beneficial in delivering predictable and controllable monodisperse droplets in a high flow process regime.
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