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Head Loss Formula

GoHead Loss Due to Fitting Formula

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Head Loss due to Friction is the reduction in fluid pressure energy as it flows through a conduit, caused by friction between the fluid and the conduit walls. Check FAQs

H f = \frac{f \cdot L p \cdot {V avg}^{2}}{2 \cdot D \cdot [g]}

H_f - Head Loss due to Friction?f - Friction Factor?L_p - Pipe Length?V_avg - Fluid Average Velocity?D - Pipe Diameter?[g] - Gravitational acceleration on Earth?

Head Loss Example

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Here is how the Head Loss equation looks like with Values.

Here is how the Head Loss equation looks like with Units.

Here is how the Head Loss equation looks like.

12.3173 = \frac{0.03 \cdot 36.75 \cdot {3.31}^{2}}{2 \cdot 0.05 \cdot 9.8066}

12.3173m = \frac{0.03 \cdot 36.75m \cdot {3.31m/s}^{2}}{2 \cdot 0.05m \cdot 9.8066m/s²}

12.3173 = \frac{0.03 \cdot 36.75 \cdot {3.31}^{2}}{2 \cdot 0.05 \cdot 9.8066}

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Head Loss Solution

Follow our step by step solution on how to calculate Head Loss?

FIRST Step Consider the formula

H f = \frac{f \cdot L p \cdot {V avg}^{2}}{2 \cdot D \cdot [g]}

Next Step Substitute values of Variables

∴

H f = \frac{0.03 \cdot 36.75m \cdot {3.31m/s}^{2}}{2 \cdot 0.05m \cdot [g]}

Next Step Substitute values of Constants

∴

H f = \frac{0.03 \cdot 36.75m \cdot {3.31m/s}^{2}}{2 \cdot 0.05m \cdot 9.8066m/s²}

Next Step Prepare to Evaluate

∴

H f = \frac{0.03 \cdot 36.75 \cdot {3.31}^{2}}{2 \cdot 0.05 \cdot 9.8066}

Next Step Evaluate

∴

H f = 12.3172543631107m

LAST Step Rounding Answer

∴

H f = 12.3173m

Head Loss Formula Elements

Variables

Constants

Head Loss due to Friction

Head Loss due to Friction is the reduction in fluid pressure energy as it flows through a conduit, caused by friction between the fluid and the conduit walls.

Symbol: H_f

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Head Loss due to Friction

Friction Factor

Friction Factor represents the resistance to flow in a pipe or conduit, influenced by surface roughness and fluid properties, crucial in calculating pressure drops.

Symbol: f

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Friction Factor

Pipe Length

Pipe Length refers to the distance between two points along a conduit or pipeline, impacting fluid flow dynamics, friction losses, and pressure drop, crucial in system design and analysis.

Symbol: L_p

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Pipe Length

Fluid Average Velocity

Fluid Average Velocity is the mean speed at which fluid particles travel through a cross-section of a conduit, influencing flow rate and dynamics, typically measured in meters per second (m/s).

Symbol: V_avg

Measurement: SpeedUnit: m/s

Note: Value should be greater than 0.

Formulas to find Fluid Average Velocity

Pipe Diameter

Pipe Diameter is the width of a cylindrical conduit, crucial in fluid dynamics, influencing flow rate, pressure drop, and system design, typically measured in millimeters or inches.

Symbol: D

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Pipe Diameter

Gravitational acceleration on Earth

Gravitational acceleration on Earth means that the velocity of an object in free fall will increase by 9.8 m/s2 every second.

Symbol: [g]

Value: 9.80665 m/s²

Other Formulas to find Head Loss due to Friction

Go Head Loss Due to Fitting

H f = \frac{K \cdot {V avg}^{2}}{2 \cdot [g]}

Other formulas in Flow Measurement category

Go Reynolds number of fluid flowing in Pipe

R = \frac{V \cdot D \cdot ρ}{µ a}

Go Flow Rate

F v = A \cdot V avg

Go Mass Flow Rate

Q = ρ m \cdot F v

Go Volume Flow Rate

F v = \frac{Q}{ρ m}

How to Evaluate Head Loss?

Head Loss evaluator uses Head Loss due to Friction = (Friction Factor*Pipe Length*Fluid Average Velocity^2)/(2*Pipe Diameter*[g]) to evaluate the Head Loss due to Friction, The Head Loss formula is defined as a measure of the reduction in the total head (sum of elevation head, velocity head, and pressure head) of the fluid as it moves through a fluid system. Head Loss due to Friction is denoted by H_f symbol.

How to evaluate Head Loss using this online evaluator? To use this online evaluator for Head Loss, enter Friction Factor (f), Pipe Length (L_p), Fluid Average Velocity (V_avg) & Pipe Diameter (D) and hit the calculate button.

FAQs on Head Loss

What is the formula to find Head Loss?

The formula of Head Loss is expressed as Head Loss due to Friction = (Friction Factor*Pipe Length*Fluid Average Velocity^2)/(2*Pipe Diameter*[g]). Here is an example- 12.31725 = (0.03*36.75*3.31^2)/(2*0.05*[g]).

How to calculate Head Loss?

With Friction Factor (f), Pipe Length (L_p), Fluid Average Velocity (V_avg) & Pipe Diameter (D) we can find Head Loss using the formula - Head Loss due to Friction = (Friction Factor*Pipe Length*Fluid Average Velocity^2)/(2*Pipe Diameter*[g]). This formula also uses Gravitational acceleration on Earth constant(s).

What are the other ways to Calculate Head Loss due to Friction?

Here are the different ways to Calculate Head Loss due to Friction-

Head Loss due to Friction=(Head Loss Coefficient*Fluid Average Velocity^2)/(2*[g])

Can the Head Loss be negative?

No, the Head Loss, measured in Length cannot be negative.

Which unit is used to measure Head Loss?

Head Loss is usually measured using the Meter[m] for Length. Millimeter[m], Kilometer[m], Decimeter[m] are the few other units in which Head Loss can be measured.

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Head Loss Formula

​GoHead Loss Due to Fitting Formula

Head Loss Example

Head Loss Solution

Head Loss Formula Elements

Other Formulas to find Head Loss due to Friction

Other formulas in Flow Measurement category

How to Evaluate Head Loss?

FAQs on Head Loss

Variable Name

GoHead Loss Due to Fitting Formula