Problem Statement
Our calculation will be based on the following data: droplet velocity coming out of the nozzle, 5 m/s, droplet diameter 50 mm, dynamic viscosity of air m=1.8x10-5 (N.s/m2), density of air 1.225 kg/m3. Due to the initial high ejection speed, the droplet Reynolds number is expected to exceed 1, the upper limit that the Stokes’ law is still applicable. However, as will be shown later, the droplet velocity decreases exponentially and we are going to assume that the Stokes’ law is valid at all time for simplicity. Consequently, the drag coefficient of the droplet can be represented as CD=24/Re.
Jet column breaks down, forming the primary droplet
Long tail trailing the primary droplet forms satellite droplets