Design of Separator with Internals

      Liquid separation from the gas phase can be accomplished by any combination of the separation mechanisms previously described. Souders-Brown Equation for Gravity Settling.This equation can be simplified to describe the liquid spherical droplet terminal velocity as a function of the droplet diameter and the drag coefficient. The simplified form of the terminal velocity equation is called the Souders-Brown Equation.The equation is valid for vertical gas flow, where the drag due to upward gas flow and the downward gravity force are in balance. The equation is also frequently used to determine the downward vertical terminal velocity of droplets in horizontal fluid flow, even though this relationship is not as rigorous, especially at higher fluid velocities. The Souders-Brown equation is used in a number of ways to design equipment for gravity settling in the oil and gas industry.