Washburn's equation
Equation describing the penetration length of a liquid into a capillary tube with time / From Wikipedia, the free encyclopedia
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In physics, Washburn's equation describes capillary flow in a bundle of parallel cylindrical tubes; it is extended with some issues also to imbibition into porous materials. The equation is named after Edward Wight Washburn;[1] also known as Lucas–Washburn equation, considering that Richard Lucas[2] wrote a similar paper three years earlier, or the Bell-Cameron-Lucas-Washburn equation, considering J.M. Bell and F.K. Cameron's discovery of the form of the equation in 1906.[3]