Numerical Simulation of Hydrophobicity Effect on Microchannel Walls in Droplet Formation

Numerical simulation of the hydrophobicity effect of microchannel walls in the process of droplet formation has been performed# two geometry configuration, t-junction and double t-junction have been used to investigate this effect# in both geometry contact angle between walls and continuous phase has been studied as an important factor for hydrophobicity# the result shows that in both geometry configuration, an increase of contact angle from 90° to 180° has an important role in the formation of the droplet and their shape# when contact angle is under 90° in t-junction, there is no droplet formation but in double t-junction, droplet formation still happens# so we can generate droplets at both hydrophilic and hydrophobic walls in double t-junction flow-focusing devices which is an advantage of double t-junction over t-junction#