Lucas-Washburn Capillary Flow Calculator
Passive microfluidics & point-of-care diagnostics: Model spontaneous capillary wetting ($L(t)$), filling time ($t_{fill}$), meniscus velocity ($v$), and Young-Laplace driving pressure.
Microchannel Dimensions
Liquid & Surface Wetting Properties
Pure water = 72.8 mN/m
< 90° for spontaneous capillary action
Evaluation time checkpoint
Capillary Filling Kinetics
Penetration Distance L(t):
--
-- % filled
Total Fill Time t_fill:
--
To complete 100% length
Capillary Pressure ΔP_c:
--
Young-Laplace driving head
Meniscus Velocity at t:
--
Instantaneous speed (dL/dt)
| Hydraulic Radius r_h: | -- |
| Washburn Penetration Rate k_w: | -- |
| Liquid Flow Rate at t: | -- |
| Flow Mechanism: | Viscous-Capillary Balance (L ∝ √t) |
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