FormulaDen.com

Physics Chemistry Math Chemical Engineering Civil Electrical Electronics Electronics and Instrumentation Materials Science Mechanical Production Engineering Financial Health

Wall shear stress Formula

Fx Copy

LaTeX Copy

Wall shear stress is defined as the shear stress in the layer of fluid next to the wall of a pipe. Check FAQs

τ w = \frac{C fx \cdot ρ \cdot ({u ∞}^{2})}{2}

τ_w - Wall Shear Stress?C_fx - Local Friction Coefficient?ρ - Density?u_∞ - Free Stream Velocity?

Wall shear stress Example

With values

With units

Only example

Here is how the Wall shear stress equation looks like with Values.

Here is how the Wall shear stress equation looks like with Units.

Here is how the Wall shear stress equation looks like.

801189.2 = \frac{0.328 \cdot 997 \cdot (70^{2})}{2}

801189.2Pa = \frac{0.328 \cdot 997kg/m³ \cdot ({70m/s}^{2})}{2}

801189.2 = \frac{0.328 \cdot 997 \cdot (70^{2})}{2}

Tip: Use pencil ( Pencil

) icon above to edit Input Values and Units.

Calculate

Recalculate

Solution

Copy

Reset

You are here -

Home » Category

Physics » Category

Mechanical » Category

Heat and Mass Transfer » fx Wall shear stress

Wall shear stress Solution

Follow our step by step solution on how to calculate Wall shear stress?

FIRST Step Consider the formula

τ w = \frac{C fx \cdot ρ \cdot ({u ∞}^{2})}{2}

Next Step Substitute values of Variables

∴

τ w = \frac{0.328 \cdot 997kg/m³ \cdot ({70m/s}^{2})}{2}

Next Step Prepare to Evaluate

∴

τ w = \frac{0.328 \cdot 997 \cdot (70^{2})}{2}

LAST Step Evaluate

∴

τ w = 801189.2Pa

Wall shear stress Formula Elements

Variables

Wall Shear Stress

Wall shear stress is defined as the shear stress in the layer of fluid next to the wall of a pipe.

Symbol: τ_w

Measurement: PressureUnit: Pa

Note: Value can be positive or negative.

Formulas to find Wall Shear Stress

Local Friction Coefficient

Local Friction Coefficient for the flow in ducts is the ratio of wall shearing stress and dynamic head of the stream.

Symbol: C_fx

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Local Friction Coefficient

Density

The Density of a material shows the denseness of that material in a specific given area. This is taken as mass per unit volume of a given object.

Symbol: ρ

Measurement: DensityUnit: kg/m³

Note: Value should be greater than 0.

Formulas to find Density

Free Stream Velocity

Free Stream Velocity is defined as at some distance above the boundary the velocity reaches a constant value that is free stream velocity.

Symbol: u_∞

Measurement: SpeedUnit: m/s

Note: Value can be positive or negative.

Formulas to find Free Stream Velocity

Other formulas in Laminar Flow category

Go Hydrodynamic boundary layer thickness at distance X from leading edge

𝛿hx = 5 \cdot x \cdot {Re x}^{- 0.5}

Go Thermal boundary layer thickness at distance X from leading edge

𝛿Tx = 𝛿hx \cdot {Pr}^{- 0.333}

Go Displacement thickness

𝛿 d = \frac{𝛿hx}{3}

Go Momentum thickness

θ = \frac{𝛿hx}{7}

How to Evaluate Wall shear stress?

Wall shear stress evaluator uses Wall Shear Stress = (Local Friction Coefficient*Density*(Free Stream Velocity^2))/2 to evaluate the Wall Shear Stress, Wall shear stress formula is defined as a measure of the frictional force per unit area exerted by a fluid flowing along a solid surface, typically used to analyze the flow behavior over a flat plate, and is an important parameter in understanding the flow dynamics and its effects on the surface. Wall Shear Stress is denoted by τ_w symbol.

How to evaluate Wall shear stress using this online evaluator? To use this online evaluator for Wall shear stress, enter Local Friction Coefficient (C_fx), Density (ρ) & Free Stream Velocity (u_∞) and hit the calculate button.

FAQs on Wall shear stress

What is the formula to find Wall shear stress?

The formula of Wall shear stress is expressed as Wall Shear Stress = (Local Friction Coefficient*Density*(Free Stream Velocity^2))/2. Here is an example- 801189.2 = (0.328*997*(70^2))/2.

How to calculate Wall shear stress?

With Local Friction Coefficient (C_fx), Density (ρ) & Free Stream Velocity (u_∞) we can find Wall shear stress using the formula - Wall Shear Stress = (Local Friction Coefficient*Density*(Free Stream Velocity^2))/2.

Can the Wall shear stress be negative?

Yes, the Wall shear stress, measured in Pressure can be negative.

Which unit is used to measure Wall shear stress?

Wall shear stress is usually measured using the Pascal[Pa] for Pressure. Kilopascal[Pa], Bar[Pa], Pound Per Square Inch[Pa] are the few other units in which Wall shear stress can be measured.

Let Others Know

✖

Facebook

Twitter

Copied!

: Value
: Unit

Wall shear stress Formula

Wall shear stress Example

Wall shear stress Solution

Wall shear stress Formula Elements

Other formulas in Laminar Flow category

How to Evaluate Wall shear stress?

FAQs on Wall shear stress

Variable Name