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Hydraulic Diameter
342.9 mm
Hydraulic Diameter vs Duct Width (a)
सूत्र
## Hydraulic Diameter The hydraulic diameter allows non-circular conduits to be analysed using the same formulas developed for circular pipes. ### Formula **D_h = 4 A / P** where A is the cross-sectional flow area and P is the wetted perimeter. For a rectangular duct with sides a and b: D_h = 4ab / (2(a+b)) = 2ab / (a+b). For a circle, D_h equals the actual diameter.
हल किया गया उदाहरण
A rectangular HVAC duct 400 mm wide and 300 mm tall.
- 01Area = 400 x 300 = 120,000 mm^2
- 02Perimeter = 2 x (400 + 300) = 1,400 mm
- 03D_h = 4 x 120,000 / 1,400 = 342.9 mm
अक्सर पूछे जाने वाले प्रश्न
Why not just use the average of width and height?
The hydraulic diameter accounts for the relationship between flow area and wall friction area (wetted perimeter). A simple average would not correctly represent the friction behaviour.
What is hydraulic diameter for a square duct?
For a square duct with side s, D_h = 4s^2 / (4s) = s. The hydraulic diameter equals the side length.
When is hydraulic diameter used?
Use it for computing Reynolds number, friction factor, and head loss in non-circular conduits: HVAC ducts, open channels, annular spaces, and non-standard piping cross-sections.
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