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Related Concept Videos

Contact Angle01:13

Contact Angle

When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive force...
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Hydrostatic Pressure Force on a Curved Surface

Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
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Types of Friction Problems

Friction is an essential concept in physics, engineering, and everyday life. It is the force that opposes the relative motion or tendency of such motion between two surfaces in contact. One of the most common types of friction encountered in various applications is dry friction. Dry friction problems can be broadly categorized into three types, each with unique characteristics and challenges.
The first type of dry friction problem involves situations where there is no apparent impending motion.
Frictional Force01:07

Frictional Force

When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...

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Contact angle hysteresis on randomly rough surfaces: a computational study.

Robert David1, A Wilhelm Neumann

  • 1Department of Mechanical & Industrial Engineering, Room RM502A, University of Toronto, 5 King's College Rd., Toronto, ON, Canada M5S 3G8.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 20, 2013
PubMed
Summary
This summary is machine-generated.

Surface roughness significantly impacts wetting behavior and contact angle hysteresis. Hysteresis increases with the Wenzel roughness parameter on rough surfaces, with micrometer roughness causing a few degrees of hysteresis.

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Area of Science:

  • Surface science
  • Computational physics
  • Materials science

Background:

  • Wetting phenomena are crucial in diverse scientific and industrial applications.
  • Real-world surfaces possess inherent roughness, influencing wetting characteristics.
  • Contact angle hysteresis, a key wetting parameter, is poorly understood on rough surfaces.

Purpose of the Study:

  • To investigate the influence of surface roughness on wetting.
  • To specifically analyze the impact of roughness on contact angle hysteresis.
  • To establish a quantitative relationship between roughness parameters and hysteresis.

Main Methods:

  • Utilized free energy-based computational simulations.
  • Employed randomly rough, self-affine surface models.
  • Focused on analyzing the Wenzel roughness parameter (r).

Main Results:

  • Contact angle hysteresis is directly correlated with surface roughness.
  • Hysteresis increases proportionally with the Wenzel roughness parameter (r - 1).
  • Micrometer-level roughness was found to induce contact angle hysteresis of several degrees.

Conclusions:

  • Surface roughness is a primary determinant of contact angle hysteresis.
  • The Wenzel roughness parameter provides a quantitative measure of hysteresis.
  • Computational simulations offer valuable insights into wetting phenomena on rough surfaces.