Persamaan Darcy-Weisbach dan kalkulasi online

Persamaan Darcy-Weisbach

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Dalam dinamika fluida, persamaan Darcy-weisbach adalah persamaan fenomenologika yang berkaitan dengan head loss, atau kehilangan tekanan akibat gesekan sepanjang pipa terhadap kecepatan aliran rata-rata. Persemaan ini terbentuk atas kontribusi Henry Darcy dan Julius weisbach
Persamaan Darcy-weisbach mengandung faktor gesekan tak berdimensi, yang dinamai faktor gesekan Darcy, faktor gesekan Darcy-Weisbach, atau faktor gesekan Moody. Faktor gesekan Darcy besarnya empat kali faktor gesekan Fanning, dan tidak boleh disamakan.
Head loss dapat dihitung dengan:

dengan

• hf adalah head loss akibat gesekan;
• L adalah panjang pipa;
• D adalah diameter hidrolik dari pipa (untuk pipa yang berbentuk melingkar, diameter hidrolik sebanding dengan diameter pipa tersebut);
• V adalah kecepatan rata-rata dari aliran, sebanding dengan debit aliran dibagi dengan perimeter basah;
• g adalah percepatan gravitasi;
• f adalah koefisien tak berdimensi yang disebut faktor gesekan Darcy;

[sunting] Referensi

• De Nevers (1970), Fluid Mechanics, Addison-Wesley.
• Diagram Moody

Diperoleh dari "http://id.wikipedia.org/wiki/Persamaan_Darcy-Weisbach"

Kategori: Persamaan dinamika fluida | Persamaan Fisika | Persamaan Matematika

Darcy-Weisbach formula Pressure drop in a circular pipe.			Engineering index Fluid dynamics index
				The equation states that the pressure loss ΔP=fLρV²/2D (where L and D are th pipe length and diameter, ρ is the fluid density, V is the average velocity through the pipe, and f is the Darcy friction factor). Head loss is also available through the unit menus.
	Pipe diameter: m --- METRIC --- pm nm microns (µm) mm cm km -- IMPERIAL -- mil 1/16 inch inches feet yards miles - SCIENTIFIC - Planck Bohrs Angstrom light-seconds light-years au parsecs --- OTHER --- points cubits fathoms rods chains football fields furlongs Roman miles nautical miles leagues Pipe length: m --- METRIC --- pm nm microns (µm) mm cm km -- IMPERIAL -- mil 1/16 inch inches feet yards miles - SCIENTIFIC - Planck Bohrs Angstrom light-seconds light-years au parsecs --- OTHER --- points cubits fathoms rods chains football fields furlongs Roman miles nautical miles leagues Velocity: m/s --- METRIC --- cm/s km/s -- IMPERIAL -- inches/second feet/second feet/minute - RECIPROCAL - min/mile min/km min/5 km min/10 km --- OTHER --- km/h mph miles/second knots furl's/f'night Mach c (light speed) Discharge rate: m³/s mL/min liter/min liter/s m³/min cu ft/s cu ft/min gal(US)/min gal(UK)/min Darcy friction factor: Density: kg/m³ g/m³ g/cm³ oz/in³ lb/ft³ Pressure drop: Pa nPa µPa mPa kPa MPa GPa atm kgf/cm²   (at) mbar bar mmHg (Torr) in Hg ft H2O m H2O psi Add Atau bisa juga yg ini  Email  Print  Favorites | Darcy-Weisbach Equations and Formulas CalculatorFluid Mechanics - Hydraulics Solving for pipe length. Inputs: friction factor (f)  head loss (h)  meter attometer centimeter chain dekameter decimeter exameter femtometer foot gigameter hectometer inch kilometer light year link megameter micrometer micron mile millimeter nanometer petameter picometer rod terameter yard pipe diameter (D)  meter attometer centimeter chain dekameter decimeter exameter femtometer foot gigameter hectometer inch kilometer light year link megameter micrometer micron mile millimeter nanometer petameter picometer rod terameter yard flow velocity (V)  meter/second centimeter/hour centimeter/second foot/day foot/second inch/hour inch/second kilometer/second knot mach sea level 15 C meter/day mile/hour mile/second millimeter/second speed of light in vacuum yard/second acceleration of gravity (g)  meter/second^2 centimeter/second^2 foot/second^2 inch/second^2 kilometer/second^2 mile/second^2 millimeter/second^2 yard/second^2 Conversions: f  =  0    =  0   h  =  0    =  0   foot D  =  0    =  0   foot V  =  0    =  0   foot/second g  =  0    =  0   foot/second^2 Solution: pipe length (L)  =  HAS NOT BEEN CALCULATED  Other Units: Change Equation Select an equation to solve for a different unknown Solve for head loss Solve for friction factor Solve for pipe length Solve for pipe diameter Solve for flow velocity Solve for acceleration of gravity Where h  =  head loss f  =  friction factor  L  =  pipe length  D  =  pipe diameter  V  =  flow velocity g  =  acceleration of gravity Reference - Books: 1) Warren Viessman and Mark J. Hammer. 1993. Water Supply and Pollution Control. Harper Collins College Publishers, Inc. 5th ed.			Only either the velocity or the discharge rate needs to be entered. The Darcy friction factor f is also known as the "flow coefficient" λ or the Moody friction factor, and is 4x the Fanning friction factor. It is dependant on many factors such as the pipe material, shape, and fluid velocity. Therefore, it must be known or calculated for each specific use. For laminar flow in a circular pipe, it is 64/Re. Other calcs designed for specific conditions are available, which do not have the need for a known value of f.