Washburn's Equation

<p> The equation describes the <a class="wikilink" href="/flow/"> flow </a> of a liquid inside a <a class="wikilink" href="/capillary/"> capillary </a> of a given radius. I need to do a bit more of reading, but it relates the penetration of the liquid to time, <a class="wikilink" href="/viscosity/"> viscosity </a> , <a class="wikilink" href="/surface_tension/"> surface tension </a> , radius, and <a class="wikilink" href="/contact_angle/"> contact angle </a> . </p> <p> The original equation is from 1906, so I assume there should be a lot of work and characterizations done for multiple materials. </p> <p> This relationship can be of great help to characterize the liquid inside the <a class="wikilink" href="/hollow_optical_fiber/"> hollow optical fiber </a> setup of <a class="wikilink" href="/dispertech/"> Dispertech </a> : 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. </p> <p> See: <a href="https://en.wikipedia.org/wiki/Washburn%27s_equation"> Wikipedia </a> as starting point. </p>