The conventional method of capturing entrained fine droplets of liquid involves use of demisters or mist eliminators.

All demisters work on the principle of capturing fine droplets entrained in a gas phase in such a way that they are not re-entrainable into the gas phase.

The mechanism can be by:

  • Changing the direction of the gas stream thereby inducing inertial impaction of the heavier droplet or by reducing the velocity of the droplets below their terminal settling velocity and intercepting them with static surface;
  • Allowing the fine droplets to diffuse through very narrow spaces smaller than their mean free path and then impinging on a surface due to Brownian motion;
  • Directly impinging onto a surface.

The six primary types of demister are: