Abstract
Present work reports the influence of wall slip during microfluidic droplet formation in T-junction. A FEM based numerical technique in conjunction with conservative two phase Level SET method has been used to track droplet interface during formation and its movement. The experiment results has been used to validate the present numerical model. The influence of slip velocity on the droplet length and its movement has been investigated for different flow rate ratios. The length of the droplet increases, as the slip length of the channel wall increases. Further, the influence of wall slip on the leakage (gutter) flow during the downstream movement of a stable droplet in the main channel has been investigated. The leakage flow in the corner of the channel decreases, as the wall slip increases during downstream movement of the stable droplet in the channel. An increase in slip length causes pressure drop to decrease across the droplet front interface. The advancing and the receding contact angle decreases and increases respectively, with the increase in wall slip.
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