ABSTRACT
Separators are normally designed as steady-state equipment, that is, the fluid physical properties do not change with time, though a dynamic state in a separator is not uncommon.
In a vertical vessel, the gas flow is always in the upward direction, and the liquid droplet will have two forces acting on it. The gravitational force will act downward, trying to settle the droplet, and the drag force will act upward, trying to carry the droplet along with the gas phase (Figure 6.1). The gravitational force depends on the density of the liquid droplet, and the drag force depends on the Reynolds number and the size and shape of the particle.
