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The Hydraulic Diameter of a Circular Duct calculator computes the hydraulic diameter of a circular duct based on the radius (r) of the duct.
INSTRUCTION: Choose units and enter the following:
- (r) This is the radius of the duct.
Hydraulic Diameter (DH): The diameter is returned in meters. However, this can be automatically converted to compatible units via the pull-down menu.
The Math / Science
Hydraulic diameter of circular duct
dh = 2•r
where:
- dh is the hydraulic diameter of a circular duct
- r is the pipe or duct radius
A hydraulic diameter is useful for dimensionless quantities (e.g. Reynolds number or Gauckler-Manning Equation) which employ a single variable for flow analysis.
Hydraulic diameter is mainly used for calculations involving turbulent flow. Secondary flows can be observed in non-circular ducts as a result of turbulent shear stress in the turbulent flow. Hydraulic diameter is also used in calculation of heat transfer in internal-flow problems.
