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Toricelli formula


1. Formula
2. Time to empty a tank

1. Formula

Toricelli formula is applied to calculate tank orifice flowrate

Toricelli formula

Flow of liquid out of a tank through an orifice

Q=Liquid flowrate at orifice (m3/s)
C=Orifice coefficient (-)
A1=Orifice area (m2)
h=Height of liquid from top of tank to middle of orifice (m)
g=gravity acceleration (m.s-2)

g=9.81 m.s-2
C=0.6 for non profiled orifice

2. Time to empty a tank

Time to empty a tank

tv=Time in s to discharge a tank up to the level of the orifice (s)
H=Height of liquid at t=0 (m)

Source

Mecanique et Rheologie des fluides en genie chimique, Noel Midoux, Lavoisier Tec et Doc, page 51