Enter the velocity and density at blow condition and the velocity and density at MCR condition into the calculator to determine the disturbance factor.

## Disturbance Factor Formula

The following equation is used to calculate the Disturbance Factor.

DF = [ 1/2*pb*Vb^2 ] / [ 1/2*pm*Vm^2 ]

• Where DF is the disturbance factor
• pb is the density at blow conditions (kg/m^3)
• Vb is the velocity at blow conditions (m/s)
• pm is the density at MCR conditions (kg/m^3)
• Vm is the velocity at MCR conditions (m/s)

## What is a Disturbance Factor?

Definition:

A disturbance factor is a measure of the ratio of kinetic energy during blow conditions to the kinetic energy during MCR conditions.

## How to Calculate Disturbance Factor?

Example Problem:

The following example outlines the steps and information needed to calculate the Disturbance Factor.

First, determine the density and velocity at blow conditions.

For this example, the density and velocity at blow conditions is given as 1000kg/m^3 and 4 m/s respectively.

Next, determine the density and velocity at MCR conditions.

In this case, these are found to be 1200 kg/m^3 and 5 m/s respectively.

Finally, calculate the disturbance factor using the formula above:

DF = [ 1/2*pb*Vb^2 ] / [ 1/2*pm*Vm^2 ]

DF = [ 1/2*1000*4^2 ] / [ 1/2*1200*5^2 ]

DF = .5333