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Related Concept Videos

Rise of Liquid in a Capillary Tube01:18

Rise of Liquid in a Capillary Tube

When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
Types of Fluids01:27

Types of Fluids

Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and their...

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Glass-Based Devices to Generate Drops and Emulsions
08:45

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Published on: April 5, 2022

Controlling liquid drops with texture ratchets.

Todd A Duncombe1, E Yegân Erdem, Ashutosh Shastry

  • 1Department of Electrical Engineering, University of Washington, Seattle, WA 98195-2500, USA.

Advanced Materials (Deerfield Beach, Fla.)
|February 15, 2012
PubMed
Summary
This summary is machine-generated.

Controlled vibrations propel microliter drops using asymmetric pinning forces on microstructured tracks. This innovation enables simple microfluidic systems for precise fluid manipulation.

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Area of Science:

  • Fluid dynamics
  • Microfluidics
  • Surface science

Background:

  • Microfluidic systems offer precise control over small fluid volumes.
  • Controlling droplet motion on surfaces is crucial for lab-on-a-chip devices.
  • Vibration-induced phenomena are increasingly explored for fluid manipulation.

Purpose of the Study:

  • To demonstrate a novel method for propelling multiple microliter-sized drops.
  • To develop simple microfluidic systems utilizing controlled vibrations.
  • To investigate the role of asymmetric pinning forces in droplet propulsion.

Main Methods:

  • Utilizing controlled vibrations applied to microstructured tracks.
  • Analyzing the oscillations of the three-phase contact line.
  • Engineering asymmetric pinning forces to direct droplet movement.

Main Results:

  • Selective propulsion of multiple microliter drops was achieved.
  • The system demonstrated rectification of oscillations into directed motion.
  • Droplet movement was consistently observed in the direction of higher pinning force.

Conclusions:

  • Controlled vibrations provide an effective mechanism for droplet propulsion in microfluidics.
  • Asymmetric pinning forces, rectified from oscillations, are key to directional movement.
  • This method simplifies microfluidic system design for precise fluid handling.