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Flow Measurement - Rotameter

AF = π/4· DF2

mm = Lt/(Dt - Db)

cc = - Lt· Db/(Dt - Db)

D1 = (h - cc)/mm

A1 = π/4· D12

A2 = A1 - AF

w = CR· A2· [2· g· VF· (ρF - ρ)· ρ/(AF· (1 - (A2/A1)2))]1/2

q = w/ρ

Rotameter rise, h = inches
Density, ρ = lb per ft3
Float volume, VF = in3
Float diameter, DF = in
Float density, ρF = lb per ft3
Tube diameter at the bottom, Db = inches
Tube diameter at the top, Dt = inches
Tube length, Lt = inches
Rotameter coefficient, CR =