|
|
| Line 1: |
Line 1: |
| The '''hydraulic diameter''', ''D<sub>H</sub>'', is a commonly used term when handling [[Fluid dynamics|flow]] in noncircular tubes and channels. Using this term one can calculate many things in the same way as for a round tube. It is defined as
| | Eusebio is the name women and men use to call my home and I think in which sounds quite good when you say it. I used to be [http://Www.encyclopedia.com/searchresults.aspx?q=unemployed unemployed] but then now I am a very cashier. My house is then in South Carolina and I don't plan changing it. It's not a common item but what I desire doing is bottle t-shirts collecting and now My hubby and i have time to acquire on new things. I'm not awesome at webdesign but your [http://www.reddit.com/r/howto/search?q=preferred+retail preferred retail] stores want to check the best website: http://circuspartypanama.com<br><br> |
| :<math> D_H = \frac {4A}{P} </math>
| |
|
| |
|
| where ''A'' is the [[Cross section (geometry)|cross sectional]] [[area]] and ''P'' is the [[wetted perimeter]] of the cross-section.
| | My web blog :: [http://circuspartypanama.com hack Clash of Clans] |
| | |
| For a round tube, this checks as:
| |
| | |
| :<math> D_H = D </math> | |
| | |
| 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, but four times.
| |
| | |
| For an [[Annulus (mathematics)|annulus]] the hydraulic diameter is
| |
| | |
| :<math> D_H = \frac{4 \cdot 0.25 \pi (D_o^2 - D_i^2)} {\pi (D_o + D_i)} = D_o - D_i </math> | |
| | |
| and for a rectangular duct, if completely filled with fluid:
| |
| | |
| :<math> D_H = \frac {4 L W} {2 (L + W)} = \frac{2LW}{L+W}</math>
| |
| | |
| And for a rectangular duct, if partly filled with fluid:
| |
| | |
| :<math> D_H = \frac {4 L W} {(L + 2W)}</math>
| |
| | |
| For the special case of a square duct, where ''L''=''W'', then ''D<sub>H</sub>'' = ''L''. For the other limiting case of a very wide duct, i.e. a slot of width ''W'' where ''W'' ≫ ''L''', then ''D<sub>H</sub>'' = 2''L''.
| |
| | |
| For a fully filled duct or pipe whose cross section is a [[regular polygon]], the hydraulic diameter is equivalent to the diameter of a circle [[inscribed]] within the [[wetted perimeter]].
| |
| | |
| Hydraulic diameter is mainly used for calculations involving [[turbulent flow]]. [[secondary flow|Secondary flows]] can be observed in non-circular ducts as a result of turbulent [[shear stress]] in the turbulent flow. When the flow is [[Laminar flow|laminar]], secondary flows do not occur.
| |
| | |
| Hydraulic diameter is also used in calculation of heat transfer in internal flow problems.
| |
| | |
| ==See also==
| |
| * [[Equivalent spherical diameter]]
| |
| * [[Hydraulic radius]]
| |
| * [[Darcy friction factor]]
| |
| | |
| [[Category:Fluid dynamics]]
| |
| [[Category:Heat transfer]]
| |
| [[Category:Hydrology| ]]
| |
| [[Category:Hydraulic engineering]]
| |
Eusebio is the name women and men use to call my home and I think in which sounds quite good when you say it. I used to be unemployed but then now I am a very cashier. My house is then in South Carolina and I don't plan changing it. It's not a common item but what I desire doing is bottle t-shirts collecting and now My hubby and i have time to acquire on new things. I'm not awesome at webdesign but your preferred retail stores want to check the best website: http://circuspartypanama.com
My web blog :: hack Clash of Clans