Enter the required information into the calculator to determine the self-cleansing velocity and necessary slope and size.
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Self Cleansing Velocity Formula
The following equation is used to calculate the Self Cleansing Velocity.
Vs = 1/n * R ^(1/6) * SQRT ( B*(Gs-1) * ds )
- Where Vs is the self cleansing velocity
- R is the hydraulic radius
- n is the Manning's coefficient of roughness
- B is the dimensionless constant of the characteristics of the particles
- Gs is the specific gravity of the particles
- ds is the diameter of the particles.
What is a Self Cleansing Velocity?
Self Cleansing Velocity refers to the minimum velocity required in a fluid system to prevent the accumulation of sediment or debris.
It is a critical parameter in determining the efficiency and functionality of pipelines, channels, and open channels.
When fluid flows at a certain velocity, it possesses enough kinetic energy to carry away particles or sediment that may settle on the system's surfaces.
This self-cleansing action prevents the accumulation of materials, which can lead to clogs, blockages, or reduced capacity. In other words, self-cleansing velocity ensures the continuous and unobstructed flow of fluids through a system.
By maintaining an adequate self-cleansing velocity, pipelines and channels can operate optimally.
How to Calculate Self Cleansing Velocity?
Example Problem:
The following example outlines the steps and information needed to calculate
First, determine the variables in the equation above:
R = 2
n = .25
B = .45
Gs = 1.25
ds = .45
Finally, using the formula above, calculate the self cleaning velocity:
Vs = 1/n * R ^(1/6) * SQRT ( B*(Gs-1) * ds )
Vs = 1/.25 * 2 ^(1/6) * SQRT ( .45*(1.25-1) * .45 )
Vs = 1.0102
