Effects of Tube Radius and Surface Tension on Capillary Rise Dynamics of Water/Butanol Mixtures

Capillary-driven action is an important phenomenon which aids the development of high-performance heat transfer devices, such as microscale pipes. This study examines capillary rise dynamics n-butanol/water mixture in a single vertical tube with different radii (0.4, 0.6, and 0.85 mm). For liquids, distilled water, n-butanol, their blends varying concentrations butanol (0.3, 0.5, 0.7 wt.%) were used. The results show that height velocity dependent on radius liquid surface tension. larger higher tension, lower was equilibrium (he) rise. process segregated into three characteristic regions: purely inertial, inertial + viscous, viscous regions. early stages (purely viscous) represented heights h1 h2, dominant process. There linear correlations between (h1, he), radius, Based these correlations, function established each consolidated value tension (σL/2πr2).