Hydraulic diameter

Hydraulic diameter

The hydraulic diameter, D_h , is a commonly used term when handling flow in noncircular tubes and channels. Using this term one can calculate many things in the same way as for a round tube.


D_h = frac {4A}{U}

where "A" is the cross sectional area and "U" is the wetted perimeter of the cross-section.

For a round tube, this checks as:

: D_h = frac{4 frac {pi D^2}{4{pi D} = D

The Manning formula contains a quantity called the hydraulic radius. Despite what the name may suggest, the hydraulic diameter is not twice the hydraulic radius.

For an annulus the hydraulic diameter is

: D_h = frac{4 cdot 0.25 pi (D_o^2 - D_i^2)} {pi (D_o + D_i)} = D_o - D_i

and for a rectangular duct

: D_h = frac {4 L W} {2 (L + W)} = frac{2LW}{L+W}

For the special case of a square duct, where L = W , then D_h = L . For the other limiting case of a very wide duct, i.e. a slot of width W where L gg W, then D_h = 2W.

External links

Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • hydraulic diameter — hidraulinis skersmuo statusas T sritis Standartizacija ir metrologija apibrėžtis Keturgubas šlapiojo skerspjūvio ploto ir šlapiojo perimetro dalmuo. atitikmenys: angl. hydraulic diameter vok. hydraulischer Durchmesser, m rus. гидравлический… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • Diameter — For the notion of diameter in graph theory, see Distance (graph theory). For the computer network protocol, see Diameter (protocol). Diameter In geometry, a diameter of a circle is any straight line segment that passes through the center of the… …   Wikipedia

  • Hydraulic machinery — are machines and tools which use fluid power to do work. Heavy equipment is a common example.In this type of machine, high pressure hydraulic fluid is transmitted throughout the machine to various hydraulic motors and hydraulic cylinders. The… …   Wikipedia

  • Hydraulic conductivity — Hydraulic conductivity, symbolically represented as K, is a property of vascular plants, soil or rock, that describes the ease with which water can move through pore spaces or fractures. It depends on the intrinsic permeability of the material… …   Wikipedia

  • Hydraulic clearance — Hydraulic clearance. Flow in narrow clearances are of vital importance in hydraulic system component design. The flow in a narrow circular clearance of a spool valve can be calculated according to the formula below if the height is negligible… …   Wikipedia

  • Hydraulic drive system — A hydraulic or hydrostatic drive system or hydraulic power transmission is a drive or transmission system that makes use of a hydraulic fluid under pressure to drive machinery.Such a system basically consists of: *Generator part of the… …   Wikipedia

  • Hydraulic brake — The hydraulic brake is an arrangement of braking mechanism which uses brake fluid, typically containing ethylene glycol, to transfer pressure from the controlling unit, which is usually near the operator of the vehicle, to the actual brake… …   Wikipedia

  • Hydraulic cylinder — A Hydraulic cylinder (also called a linear hydraulic motor) is a mechanical actuator that is used to give a linear force through a linear stroke. It has many applications, notably in engineering vehicles. Operation Hydraulic cylinders get their… …   Wikipedia

  • Hydraulic seal — { [refimproveA hydraulic seal is a relatively soft, non metallic ring captured in a groove or fixed in a combination of rings, forming a seal assembly, to block or separate fluid in reciprocating motion applications. Hydraulic seals are vital in… …   Wikipedia

  • Hydraulic ram — A hydraulic ram is a cyclic water pump powered by hydropower. It functions as a hydraulic transformer that takes in water at one hydraulic head and flow rate, and outputs water at a different hydraulic head and flow rate. The device utilizes a… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”