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Separator Design 357
NL number of trays below the feed tray
NM minimum number of trays
NU number of trays above the feed tray
P pressure or perimeter
P 0 internal or operating pressure, or the pressure at the surface of a filter
cake
pressure drop across a filter cake
P s
pressure produced by a vacuum pump
P v
q a measure of the thermal condition of the feed
R radius or reflux ratio
Re Reynolds Number
Rh hydraulic radius
minimum reflux ratio
R M
RO optimum reflux ratio
s specific surface (the surface area per unit volume of particle)
S stress
tc corrosion allowance, thickness
t D time for a drop to reach a liquid-liquid interface
if filtering time
t s shell thickness or surge time
t H head thickness
residence time
t R
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