Dynamics of (and off) fluid flow of gradient fibers

The general phenomenon of droplets falling from the surface is perhaps surprisingly not fully understood by scientists. Understanding the complex interactions of forces involved here is useful in industry. The structured packaging of the cooling tower should be designed to promote droplet formation in the fluid flow, but the coating mixes to maintain a pristine, smooth surface.

Furthermore, the design of the mesh used to harvest clean water from fog and dew, which is restricted, relies on understanding how water on the fibers condenses and falls into the collection tank. Masu.

Atefe pours Karimi and has completed her Ph.D. The University of Archen, Germany, supervisor and her supervisor and collaborator students analyzed the dynamics of this type of flow in detail and published their findings on special topics in European Physics Journals.

“The droplet formation in flowing films is controlled by the interaction of gravity, surface tension, inertia and viscous forces,” explains Karimi’s pour. “Mathematically, this behavior can be confusing, with slight variations in parameters leading to unpredictable behavior.” She and her colleagues use oils to flow through the sloping fibers under the influence of gravity. The process was used to study and the film thickness and tilt angle were varied.

The oil flows through the fibers as a flat film before they gather in beads or drops. They either remain stable on the fibers, collide and coalesce, or grow until they are large enough to simply peel and drop.

Karimi and her colleagues defined a new angle ratio φ that characterizes the shape of the droplets, and used this to accurately predict the behavior of each.

“We propose that the value of φ, and therefore the behavior of each droplet, is determined by the dominant force affecting its formation,” she adds. “We would like to confirm this guess using a mathematical model derived from theory.”