Template:Model theory (Text, Screen Efficiency)

Screen efficiency, or the efficiency of undersize removal, $E_{\rm {US}}$ (frac), is defined as "the fraction of sub-aperture material in the feed stream which is actually recovered to the undersize stream". Formally,

$E_{\rm {US}}={\dfrac {Q_{\rm {M,US}}}{(Q_{\rm {M,F}}).P_{\rm {Aperture}}}}$

where:

• $Q_{\rm {M,US}}$ is the mass flow rate of particles in the undersize stream (t/h)
• $Q_{\rm {M,F}}$ is the mass flow rate of particles in the feed stream (t/h)
• $P_{\rm {Aperture}}$ is the mass fraction of particles in the feed which are smaller than the aperture size (w/w)