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Related Concept Videos

Impact01:30

Impact

197
Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
197
Types of Impact01:30

Types of Impact

655
Impacts can be classified in various forms, primarily under two subgroups: central impact and oblique impact. A central impact occurs when two objects collide head-on, possessing opposite velocities aligned along the line of impact. Conversely, an oblique impact occurs when two objects collide at an angle, resulting in a modification of both direction and velocity.
The coefficient of restitution is a metric for understanding the dynamics of impacts. It quantifies the ratio of relative velocity...
655
Sieve Analysis and Grading Curves01:19

Sieve Analysis and Grading Curves

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Sieve analysis is a method used to determine the particle size distribution of aggregate materials. This process involves the following steps:
529
Impact Loading on a Cantilever Beam01:13

Impact Loading on a Cantilever Beam

499
The analysis of a cantilever beam with a circular cross-section subjected to impact loading at its free end illustrates the conversion of potential energy from a dropped object into kinetic energy, which is then absorbed by the beam as strain energy. This process is crucial for understanding how materials behave under dynamic loads, which is important in fields such as construction and aerospace.
When an object is dropped onto the free end of a cantilever, its potential energy due to gravity is...
499
Excess Pressure Inside a Drop and a Bubble01:13

Excess Pressure Inside a Drop and a Bubble

2.2K
The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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Impact: Problem Solving01:26

Impact: Problem Solving

261
In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
261

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Related Experiment Video

Updated: Sep 15, 2025

Development of an Experimental Setup for the Measurement of the Coefficient of Restitution under Vacuum Conditions
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Recoil Cavity Formation and Collapse for Drop Impact on Sieves.

Chandantaru Dey Modak1, Prosenjit Sen1

  • 1Centre for Nano Science and Engineering Indian Institute of Science Bangalore 560012 India.

Small Science
|July 16, 2025
PubMed
Summary

A novel "recoil cavity" phenomenon ejects droplets during impact on superhydrophobic sieves. This discovery advances understanding of drop impact printing for electronics, biology, and structural applications.

Keywords:
cavity collapsedroplet impactrecoil cavitysievesuperhydrophobic

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Printing technology

Background:

  • Printing technologies often rely on cavity formation and collapse to generate liquid jets or droplets.
  • Traditional methods like Worthington jets use cavity collapse for high-speed liquid ejection.

Purpose of the Study:

  • To report and investigate a distinct cavity collapse phenomenon during droplet impact on superhydrophobic sieves.
  • To explore the underlying mechanism and develop a predictive model for this new phenomenon.

Main Methods:

  • Experimental observation of droplet impact on superhydrophobic sieve surfaces.
  • Analysis of the cavity dynamics, including impact and recoil phases.
  • Development of a physical model based on energy conservation principles.

Main Results:

  • A novel "recoil cavity" is formed by the collapse of the impact cavity, ejecting an air jet through the sieve pore.
  • The recoil cavity subsequently collapses to eject a droplet.
  • The process is governed by energy conservation, with a threshold energy flux ratio determining single-drop ejection.

Conclusions:

  • The recoil cavity phenomenon is unique to droplet impact on superhydrophobic sieves.
  • The findings offer fundamental insights into drop impact printing mechanisms.
  • This research has potential applications in advanced printing technologies across diverse fields.