Friction Loss Formula

Friction Loss Formula 

The resistance needed to move a body across an external surface is called friction. However, the loss due to friction is related to liquid flow through a pipe. In another sense, the friction inside the tube results in a form of energy loss. It is closely related to the fluid’s velocity and viscosity. The viscous shear stresses and turbulence within the fluid cause resistance to the passage of fluid via a pipe. Depending on how rough the pipe material is, these turbulences form along the inside pipe wall. Friction losses are a complicated relationship between the geometry of the system, the fluid’s characteristics, and the system’s flow rate. By making observations, students can determine that in the majority of engineering flows, this loss is typically proportional to the square of the flow rate. Concepts related to friction loss and the Friction Loss Formula will be covered in this topic with examples. 

What is Friction Loss?

The resistance needed to move a body through the external surface is known as friction. However, the friction loss is correlated with the liquid flow through a pipe. Consequently, it is a form of energy loss brought on by internal friction in the tube. As a result, it is influenced by the fluid’s velocity and viscosity. Since friction loss is nothing more than an energy loss, it may be calculated as hl. This resistance, which is measured in metres of fluid head, is known as pipe friction. Numerous studies have been conducted to develop different equations to estimate this loss. 

For this calculation, the Darcy formula or the Darcy-Weisbach equation are typically used. the most precise pipe friction loss formula, which is now widely acknowledged. Despite being more challenging to calculate and apply than other friction loss formulas, it has evolved into the hydraulic engineers’ go-to equation as a result of the invention of computers.

Formula for Friction Loss

The friction loss equation is hl= f × L/D × vsquare/2g


The friction factor is f.

L is the pipe’s length.

D is the pipe’s inner diameter.

V denotes the liquid’s speed, while g is the gravitational constant.

The friction lost is hl.

Reynolds In a viscous flow, number is the fundamental dimensionless group. Velocity intervals Kinematic Viscosity divided by Length Scale. A typical roughness element’s height in relation to the flow’s scale is known as relative roughness.

Solved Examples for Friction Loss Formula

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The Extramarks website is dedicated to supporting student growth and achievement in order to promote academic excellence. The Friction Loss Formula solved examples were developed by Extramarks’ specialists after extensive research, and they also respond to students’ questions about the solutions. Students who understand every topic in the textbook and correctly answer the questions that are presented next to it will receive the highest grades in the class. It is advised that students use the Extramarks’ provided Friction Loss Formula solved examples.  

Students can apply the concepts from the chapter in a clearer and more exact way by using the solved examples of the Friction Loss Formula. The thorough and error-free Friction Loss Formula solved examples were created by highly qualified professors from the Extramarks website. These Friction Loss Formula examples were created with consideration of students’ cognitive abilities. In order to make the Friction Loss Formula easier to understand, the solved examples have been broken up into smaller, more manageable parts. Students who sign up for the Extramarks website have access to the Friction Loss Formula solved examples.

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