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Friction Velocity Formula

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Friction Velocity, also called shear velocity, is a form by which a shear stress may be re-written in units of velocity. Check FAQs

V f = V \cdot \sqrt{\frac{f}{8}}

V_f - Friction Velocity?V - Mean Velocity?f - Friction Factor?

Friction Velocity Example

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Here is how the Friction Velocity equation looks like with Values.

Here is how the Friction Velocity equation looks like with Units.

Here is how the Friction Velocity equation looks like.

9.8993 = 17.2 \cdot \sqrt{\frac{2.65}{8}}

9.8993m/s = 17.2m/s \cdot \sqrt{\frac{2.65}{8}}

9.8993 = 17.2 \cdot \sqrt{\frac{2.65}{8}}

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Friction Velocity Solution

Follow our step by step solution on how to calculate Friction Velocity?

FIRST Step Consider the formula

V f = V \cdot \sqrt{\frac{f}{8}}

Next Step Substitute values of Variables

∴

V f = 17.2m/s \cdot \sqrt{\frac{2.65}{8}}

Next Step Prepare to Evaluate

∴

V f = 17.2 \cdot \sqrt{\frac{2.65}{8}}

Next Step Evaluate

∴

V f = 9.89934341257035m/s

LAST Step Rounding Answer

∴

V f = 9.8993m/s

Friction Velocity Formula Elements

Variables

Functions

Friction Velocity

Friction Velocity, also called shear velocity, is a form by which a shear stress may be re-written in units of velocity.

Symbol: V_f

Measurement: SpeedUnit: m/s

Note: Value can be positive or negative.

Formulas to find Friction Velocity

Mean Velocity

Mean Velocity is defined as the average velocity of a fluid at a point and over an arbitrary time T.

Symbol: V

Measurement: SpeedUnit: m/s

Note: Value can be positive or negative.

Formulas to find Mean Velocity

Friction Factor

The Friction Factor or Moody chart is the plot of the relative roughness (e/D) of a pipe against Reynold's number.

Symbol: f

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Friction Factor

sqrt

A square root function is a function that takes a non-negative number as an input and returns the square root of the given input number.

Syntax: sqrt(Number)

Other formulas in Liquid Jet category

Go Angle of Jet given Maximum Vertical Elevation

Θ = a \sin (\sqrt{\frac{H \cdot 2 \cdot g}{{V o}^{2}}})

Go Angle of Jet given Time of Flight of Liquid Jet

Θ = a \sin (T \cdot \frac{g}{2 \cdot V o})

Go Angle of Jet given Time to Reach Highest Point

Θ = a \sin (T \cdot \frac{g}{V o})

Go Initial Velocity given Time of Flight of Liquid Jet

V o = T \cdot \frac{g}{\sin (Θ)}

How to Evaluate Friction Velocity?

Friction Velocity evaluator uses Friction Velocity = Mean Velocity*sqrt(Friction Factor/8) to evaluate the Friction Velocity, Friction velocity, also called Shear velocity, is a form by which a shear stress may be re-written in units of velocity. Friction Velocity is denoted by V_f symbol.

How to evaluate Friction Velocity using this online evaluator? To use this online evaluator for Friction Velocity, enter Mean Velocity (V) & Friction Factor (f) and hit the calculate button.

FAQs on Friction Velocity

What is the formula to find Friction Velocity?

The formula of Friction Velocity is expressed as Friction Velocity = Mean Velocity*sqrt(Friction Factor/8). Here is an example- 9.899343 = 17.2*sqrt(2.65/8).

How to calculate Friction Velocity?

With Mean Velocity (V) & Friction Factor (f) we can find Friction Velocity using the formula - Friction Velocity = Mean Velocity*sqrt(Friction Factor/8). This formula also uses Square Root Function function(s).

Can the Friction Velocity be negative?

Yes, the Friction Velocity, measured in Speed can be negative.

Which unit is used to measure Friction Velocity?

Friction Velocity is usually measured using the Meter per Second[m/s] for Speed. Meter per Minute[m/s], Meter per Hour[m/s], Kilometer per Hour[m/s] are the few other units in which Friction Velocity can be measured.

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Friction Velocity Formula

Friction Velocity Example

Friction Velocity Solution

Friction Velocity Formula Elements

Other formulas in Liquid Jet category

How to Evaluate Friction Velocity?

FAQs on Friction Velocity

Variable Name