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Particle Settling Rate Determination

To use the spreadsheet below, follow the following instructions every time you want to check a settling velocity.

  1. Enter in the properties of the particle and the fluid in which the particle is moving (normally air). The cells coloured in green.

  2. Then enter the particle diameter.  The cell coloured blue.

  3. Then check the Reynolds number. The yellow cell.

  4. If the Reynolds number is less than 0.1 then use the top purple settling velocity value.

  5. If the Reynolds number is between 0.1 and 1000 then use the middle purple settling velocity value
  6. If the Reynolds number is between 1000 and 350 000 then use the bottom purple settling velocity value.
  7. If for some reason the plugin does not load, please download the spreadsheet here. – Click Here for the xls file download. 
  8. Click here for the .zip download.

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Dust Monitoring Equipment - Disclaimer

All information pertains to the South African context, but in many cases equivalent legislation is available in other countries. The information contained in this website is our interpretation of the acts and guidelines available. While we may have ventured our opinion on certain issues, our opinion is based on our experience in the field of Fall-out Dust Monitoring. We hope that the information contained in our website will give you some direction on issues related to fall-out dust monitoring.

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