Computations of Compound Droplet Formation from a Co-Axial Dual Nozzle by Three-Fluid Front Tracking Method

概要

論文の詳細を見る
Formation of compound droplets from a co-axial dual nozzle was simulated by a three-fluid front tracking method. The device simulated in this study is the so-called flow focusing device. Core and shell fluids, which are the constituents of a compound droplet, are injected from inner and outer nozzles, respectively. External fluid is also injected in order to drag the core and shell fluids to promote the break up into droplets. Dripping-jetting transition was observed as in the similar manner as the formation of simple droplets in two-fluid systems. Formation of compound droplets sometimes fails and simple droplets with no core fluid produce depending on the non-dimensional numbers. The transition between compound and simple droplets was examined by changing the Capillary number (Ca) based on the core fluid and the viscosity ratio between the external fluid and the droplet fluids. When both the viscosity ratio and Ca are low, the droplets break off as simple droplets. When these numbers are moderate, compound droplets are formed. The Weber number based on the core fluid also influences the formation of compound droplets.
The Society of Chemical Engineers, Japanの論文