Washburn's Equation

First published:

Last Edited:

Number of edits:

The equation describes the flow of a liquid inside a capillary of a given radius. I need to do a bit more of reading, but it relates the penetration of the liquid to time, viscosity , surface tension , radius, and contact angle .

The original equation is from 1906, so I assume there should be a lot of work and characterizations done for multiple materials.

This relationship can be of great help to characterize the liquid inside the hollow optical fiber setup of Dispertech : if we can determine the viscosity of the medium independently (i.e. without asking the user to input it), we can have a truly self-calibrating method of determining size.

See: Wikipedia as starting point.


These are the other notes that link to this one.

Nothing links here, how did you reach this page then?


Share your thoughts on this note
Aquiles Carattino
Aquiles Carattino
This note you are reading is part of my digital garden. Follow the links to learn more, and remember that these notes evolve over time. After all, this website is not a blog.
© 2021 Aquiles Carattino
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License
Privacy Policy