Unknown

Dataset Information

0

Viscosity-enhanced droplet motion in sealed superhydrophobic capillaries.


ABSTRACT: It is well known that an increased viscosity slows down fluid dynamics. Here we show that this intuitive rule is not general and can fail for liquids flowing in confined liquid-repellent systems. A gravity-driven, highly viscous glycerol droplet inside a sealed superhydrophobic capillary is moving more than 10 times faster than a water droplet with three-orders-of-magnitude lower viscosity. Using tracer particles, we show that the low-viscosity droplets are rapidly rotating internally, with flow velocities greatly exceeding the center-of-mass velocity. This is in stark contrast to the faster moving high-viscosity droplets with nearly vanishing internal flows. The anomalous viscosity-enhanced flow is caused by a viscosity-suppressed deformation of the droplet-air interface and a hydro- and aerodynamic coupling between the droplet and the air trapped within the micro/nanostructures (plastron). Our work demonstrates the unexpected role of the plastron in controlling fluid flow beyond the mere reduction in contact area and friction.

SUBMITTER: Vuckovac M 

PROVIDER: S-EPMC7567596 | biostudies-literature |

REPOSITORIES: biostudies-literature

Similar Datasets

| S-EPMC4962083 | biostudies-literature
| S-EPMC6682058 | biostudies-literature
| S-EPMC10066525 | biostudies-literature
| S-EPMC4918357 | biostudies-literature
| S-EPMC9419300 | biostudies-literature
| S-EPMC4165459 | biostudies-literature
| S-EPMC4511949 | biostudies-literature
| S-EPMC6641040 | biostudies-literature
| S-EPMC5197947 | biostudies-literature
| S-EPMC7126630 | biostudies-literature