Parameters influencing the droplet formation in a focusing microfluidic channel

In the present work a detailed numerical study of parameters influencing droplet formation in flow-focusing microfluidic device are made. First, an extensive verification simulations with data from literature is carried out. Influence like viscosity and inflow velocity compared results showing good agreement. Some differences attributed to different techniques used: pure volume-of-fluid method used, while reference this combined level-set method. As second step model, comparison experimental was out which shows very After completed, eight new covering wide range velocities continuous phase u c . these discrete d remains unchanged. The variation reveals that increasing value , respectively capillary number Ca length reaches point saturation, i.e. where does not decrease any more. For setup saturation occurs for > 0,03. On other hand, when goes towards low values ( < 0,01 setup), size increases significantly. Further, it found numbers above around 0,015 water/oil 0,025 water + 40% glycerol / oil systems, transmission dripping jetting regimes occurs. It shown increases, higher total pressure jumps occur, also leading smaller droplets.