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Related Concept Videos

Surface Tension of Fluid01:22

Surface Tension of Fluid

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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
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Accelerating Fluids01:17

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When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:
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Turbulent Flow01:24

Turbulent Flow

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Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent...
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Kinetic Friction01:26

Kinetic Friction

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Consider a truck trying to pull a stationary car. As the truck exerts a force on the car, static friction is created at the point of contact between the two surfaces. This frictional force resists the car's movement and keeps it at rest. However, when the applied force by the truck surpasses the limiting static frictional force, an interesting phenomenon occurs. The frictional force at the interface reduces to a lower value, known as the kinetic frictional force. At this point, the car...
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Irrotational Flow01:28

Irrotational Flow

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Irrotational flow is characterized by fluid motion where particles do not rotate around their axes, resulting in zero vorticity. For a flow to be irrotational, the curl of the velocity field must be zero. This imposes specific conditions on velocity gradients. For instance, to maintain zero rotation about the z-axis, the gradient condition:
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Surface Tension, Capillary Action, and Viscosity02:57

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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Updated: May 15, 2025

Preparation of Free-Surface Hyperbolic Water Vortices
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Interfacial vortex recapture enhances thrust in tiny water skaters.

Pankaj Rohilla1, Johnathan N O'Neil1, Paras Singh2

  • 1School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA.

Biorxiv : the Preprint Server for Biology
|April 8, 2025
PubMed
Summary
This summary is machine-generated.

Water striders use interfacial vortex recapture for efficient locomotion. Their hind legs re-energize vortices shed by middle legs, boosting thrust and enabling high speeds on water.

Keywords:
BiomechanicsFluid DynamicsInterfacial locomotionVortex interactionWater skating

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Area of Science:

  • Fluid dynamics
  • Biomechanics
  • Robotics

Background:

  • Vortex recapture is key to efficient locomotion in bulk fluids, seen in insects and jellyfish.
  • Interfacial hydrodynamics of vortex recapture remain largely unexplored, despite its importance at the water's surface.

Purpose of the Study:

  • To investigate interfacial vortex recapture in the water strider *Microvelia americana*.
  • To understand the mechanisms and implications of vortex recapture at the air-water interface.

Main Methods:

  • High-speed imaging
  • Particle imaging velocimetry (PIV)
  • Physical modeling
  • Computational Fluid Dynamics (CFD) simulations

Main Results:

  • *Microvelia americana* demonstrates interfacial vortex recapture, with hind legs re-energizing vortices shed by middle legs.
  • This re-energization generates positive pressure at the hind tarsi, increasing thrust and acting as a virtual wall.
  • The tripod gait, leg morphology, and precise leg placement facilitate this vortex capture.

Conclusions:

  • Vortex recapture principles extend from bulk fluids to the air-water interface.
  • This mechanism is crucial for efficient interfacial locomotion in water striders.
  • Findings can inform the design of bio-inspired microrobots for surface exploration.