Both Experimental and Numerical Investigation on Breakup Length of Cylindrical Falling Jet

The variation in breakup length of a liquid jet subjected to different physical parameters is investigated experimentally. The different parameters are jet velocity, Reynolds number and Weber number. Effect of gravity on breakup length is also studied. Jet breakup process is simulated numerically by solving the transient axisymmetric equations of continuity and motion using an algorithm based on the Volume of Fluid (VOF) method that was previously proven successful in simulations of steady-state liquid jets. The experimental results are compared with the numerical simulation and discrepancies are discussed. The experiment shows that the breakup length first decreases with the increase of jet velocity and then increases with much higher velocity. The simulation result shows the expected pattern of the jet breakup process with satellite drop formation and droplet oscillation as can be found in experiment. It also shows the transient variation in the jet breakup process.