Numerical Study on the Jet Dynamic through Centrifuge Spinning: Influence of Angular Velocity

Centrifuge spinning is a method that makespossible of fabrication nanofibers rapidly and at high yields.in the centrifugal spinning process, a polymer solution isdelivered by the centrifugal force through small nozzle of arapidly rotating cylindrical drum. thereby, thin fibers areformed and collected on a collector in the form of a web. inthis study, a mathematical model of the dynamics of a viscousliquid jet, which emerges from rotating drum throughcentrifuge spinning, was derived. the navier-stokesequations were solved in this system with the usual viscousfree surface boundary conditions. one-dimensional equationswere derived using asymptotic methods based upon a slenderjet assumption and solved numerically. the effect of angularvelocity upon the trajectory, radius, and tangential velocity ofthe jet was simulated and presented. increasing angularvelocity resulted in a decrease in the size of the liquid jet.also, increasing angular velocity tended to increase the jetvelocity which translated to increase the production rate. thejet centerline became more tightly coiled when the angularvelocity increased. in addition, simulated jet diameter wascompared with some results reported in our previous work.