The dispersion of two immiscible fluids in a static micromixer comprising i
nterdigital channels with corrugated walls was investigated using silicon o
il dispersed in dyed as well as pure water as test systems. Silicon oil and
water flow rates between 20 mL/h to 500 mL/h and 150 mL/h to 700 mL/h were
used, respectively. The experiments revealed the dependence of the average
droplet size and size distribution on geometrical parameters of the microm
ixer and operating conditions. Dispersions with average droplet sizes as sm
all as 5.6 mu m and monomodal size distributions having small standard devi
ations of the droplet size down to 3.6 mu m could be generated using the mi
cromixer. The droplet size decreased with increasing total flow and ratio o
f the flow rates of the two liquids. In addition, a decrease of the droplet
size was found when decreasing the channel width of the mixing device. Gen
erally, the silicon oil - dyed water dispersion showed smaller average drop
let sizes and were more stable compared to the dispersions based on silicon
oil and pure water.