Coefficient of Friction Si Unit

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The corresponding CGS unit is the dyne the force required to accelerate a one gram mass by one centimeter per second squared or gcms 2. Where fm is the Moody friction factor g the acceleration due to gravity HLθ the liquid hold up fraction as a function of inclination angle θ L the pipe length P the pressure ρg the gas density ρL the liquid density ρn the no-slip density vm the mixture velocity and vsg is the superficial gas velocity.

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The density of air is 12 kgm 3.

. Roughness coefficient is unitless for the Hazen-Williams and Chezy-Manning head loss formulas and has units of millifeet mm for the Darcy-Weisbach formula. The SI unit of force is the newton symbol N which is the force required to accelerate a one kilogram mass at a rate of one meter per second squared or kgms 2. Air flows with velocity 6 ms in a duct with diameter 315 mm.

The centipoise is convenient because the viscosity of water at 20 C is about 1 cP and one centipoise is equal to the SI millipascal second mPas. The friction coefficient can be calculated by the Colebrooke Equation or by using the Moody Diagram. The SI unit of kinematic viscosity is square meter per second m 2 s whereas the CGS unit for kinematic viscosity is the stokes St or cm 2 s 1 00001 m 2 s 1 named after Sir.

The friction loss can be. You can determine the viscosity of water at a particular temperature using the water viscosity-to-temperature chart or by the interpolation method using the water viscosity-to-temperature table. A newton is thus equal to.

Example - Pressure Loss in Air Duct. The only difference being the units used. The friction coefficient is estimated to 0019 and the length of the duct is 1 m.

The flow factor uses SI-units and is used throughout the world whereas the Flow Coefficient uses imperial units and is mainly used in the United States. Draw a vertical line from the X-axis up until it reaches the graph of water viscosity. Choice of head loss formula is supplied in the OPTIONS section.

The Flow Factor k v and Flow Coefficient C v are very similar. The Flow Factor k v defines the friction loss for water at a density of ρ1000kgm 3. Using the chart simply.

Find the temperature you need from the X-axis.

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