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Related Concept Videos

Types of Collisions - II01:19

Types of Collisions - II

When two or more objects collide with each other, they can stick together to form one single composite object (after collision). The total mass of the object after the collision is the sum of the masses of the original objects, and it moves with a velocity dictated by the conservation of momentum. Although the system's total momentum remains constant, the kinetic energy decreases, and thus such a collision is an inelastic collision. Most of the collisions between objects in daily life are...
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The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary cation—the calcium...
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Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
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Midair collisions enhance saltation.

M V Carneiro1, N A M Araújo, T Pähtz

  • 1Institut für Baustoffe, ETH-Hönggerberg, Schafmattstrasse 6, 8093 Zürich, Switzerland.

Physical Review Letters
|August 20, 2013
PubMed
Summary

Midair collisions significantly boost particle transport in aeolian processes. This enhancement, crucial for understanding wind-driven sediment movement, peaks at an intermediate grain collision restitution coefficient.

Area of Science:

  • Physics
  • Earth Science
  • Geology

Background:

  • Aeolian particle transport is a fundamental geological process.
  • The role of midair collisions in particle transport has been historically debated.

Purpose of the Study:

  • To investigate the impact of midair collisions on aeolian particle transport flux.
  • To determine the influence of collision parameters, such as restitution coefficient and wind speed, on particle flux.

Main Methods:

  • Numerical simulations or experimental models were likely employed to study particle collisions.
  • Analysis focused on the relationship between collision dynamics and overall particle flux.

Main Results:

  • Midair collisions were found to substantially enhance the overall particle flux.

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  • The enhancement effect is highly dependent on the restitution coefficient and wind speed.
  • Particle flux is maximized at an intermediate restitution coefficient (around 0.7), aligning with experimental values for sand grains.

    • Conclusions:

    • Midair collisions play a significant, often underestimated, role in aeolian particle transport.
    • A 'soft bed' effect, where floating grains reflect higher-flying particles, explains the observed flux enhancement.
    • The findings provide new insights into the physics of granular avalanches and wind-driven erosion.