# 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

Where,

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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