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Hydraulic Diameter


1. General formula
2. Formula for rectangular duct
3. Formula for annular flow

1. General Formula

Hydraulic diameter is used for non-circular flow
Calculation Hydraulic Diameter
DH=Hydraulic Diameter

2. Formula for rectangular duct


Hydraulic Diameter flow in rectangular pipe

Hydraulic Diameter in rectangular pipe
Calculation of hydraulic diameter for rectangular flow

e=Height of the flow section (m)
l=Width of the flow section (m)


3. Formula for annular flow


Hydraulic Diameter flow in annular pipe

Hydraulic Diameter in annular flow
Calculation of hydraulic diameter for annular flow

R=Outside diameter of the tube (m)
K=Rinside/R
Rinside=Inside diameter of the tube (m)


Source

Mecanique et Rheologie des fluides en genie chimique, Noel Midoux, Lavoisier Tec et Doc, page 197