Enter the density of the solids, density of the fluid, diameter of the solids, and kinematic viscosity into the calculator to determine the settling velocity.

Settling Velocity Formula

The following equation is used to calculate the Settling Velocity.

V = g*(ps/pf-1)*d^2 / 18*v

  • Where V is the settling velocity
  • g is the acceleration due to gravity (9.81 m/s^2)
  • ps is the density of the solid (kg/m^3)
  • pf if the density of the fluid (kg/m^3)
  • d is the diameter of the solid (m)
  • v is the kinematic viscosity

What is a Settling Velocity?

Definition:

A settling velocity describes the rate at which solids mixed in a fluid settle to the bottom of a container.

How to Calculate Settling Velocity?

Example Problem:

The following example outlines the steps and information needed to calculate the Settling Velocity.

First, determine the density of the solid. In this example, the density of the solid is found to be 600 kg/m^3.

Next, determine the density of the fluid. For this problem, the density of the fluid is found to be 1.225 kg/m^3.

Next, determine the diameter of the solid. In this case, the diameter of the solid is measured to be .0015.

Next, determine the kinematic viscosity. This is calculated to be .46.

Finally, calculate the Settling Velocity using the formula above:

V = g*(ps/pf-1)*d^2 / 18*v

V = 9.81*(600/1.225-1)*.0015^2 / (18*.46)

V = 0.00130301303