EFFECT OF INFLUX ON THE FREE-SURFACE TRANSPORT WITHIN A HOLLOW AMPUL

A numerical investigation of free surface transport within a hollow gl ass ampule with feed-in boundary conditions is presented. The glass am pule is treated as a vertical film with a finite pressure difference a cross the film, with applied influx on the upper boundary, and with ap plied heat flux at the outer free surface. Two different sizes of glas s ampules, along with different influx values are investigated. A fini te element method with full consideration of surface tension and visco sity effects is used to solve the transient Navier-Stokes equations in cyclindrical coordinates. Radiative and convective boundary condition s are incorporated when solving the energy equation. The movement of t he inner and outer free surfaces with the specified feed-in velocity f or different dimensions and temporal temperature distribution are anal yzed. It is found that the feed-in mechanism rather than the pressure difference provides the more dominant driving forces. Also studied is the effect of using different feed-in velocities on the flow and tempe rature fields. The results presented in this work illustrate the basic effects of the feed-in mechanism of the free surface transport phenom enon