Capillary Height in Inclined Tubes.

Gravity-driven slug motion in capillary tubes

The velocity of a liquid slug falling in a capillary tube is lower than predicted for Poiseuille flow due to presence of menisci, whose shapes are determined by the complex interplay of capillary, viscous, and gravitational forces. Due to the presence of menisci, a capillary pressure proportional to surface curvature acts on the slug and streamlines are bent close to the interface, resulting in...

Capillary rise in tubes with sharp grooves

Liquid in grooved capillaries, made by e-ginserting a plate in a cylindrical tube, exhibits unusual spreading and flow properties. One example is capillary rise, where a long, upward tongue on top of the usual meniscus has been observed along the groove. We attribute the underlying mechanism to a thermodynamic instability against spreading for a (partial

Modelling Adiabatic Capillary Tubes: A Critical Analysis

Computational studies of emergent autowave phenomena in capillary tubes

Travelling autowaves are a particular feature of nonlinear active media. Those waves are characteristic of action potential propagation in cardiac and neuronal tissue, while qualitative analogous phenomena can be produced in man–made physico–chemical laboratory experiments, such as the Belousov–Zhabotinsky reaction (BZR). The waves can appear in several forms: straight, curved and circular fron...

Variable density and viscosity, miscible displacements in capillary tubes

The displacement of a more viscous fluid by a miscible, less viscous one of lower density in a horizontal capillary tube is studied by means of Stokes flow simulations. Both axisymmetric and three-dimensional simulations are conducted at Péclet numbers up to 104, in order to resolve discrepancies between earlier simulations by [C.Y. Chen, E. Meiburg, Miscible displacements in capillary tubes. P...