Computational Investigation of Various Transition Stages in the Drop Formation Process

The aim of this paper to study the various transition stages of drop formation with the help of computational techniques. These regimes are being observed by varying capillary tube dimension and flow velocity. Two different drop formation mechanisms are famed: Either the drops are formed close to the capillary tip—dripping—or they break up from an extended liquid jet—jetting. Dripping faucet regime develops during the transition of the periodic regime to the jetting regime. We use glycerin as disperse phase liquid. We found that for low Weber number, the periodic dripping regimes are obtained whereas, for the high Weber number, jetting regimes are developed. We also study the variation in thread length and size of the breakoff drops and found that the variation of the thread length and the drop’s size in periodic dripping is nearly constant while these properties change in dripping faucet regime as well as in jetting regimes.