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Momentum And Radiation Pressure

An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container. Nichols...
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Related Experiment Video

Updated: May 18, 2026

Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
13:02

Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow

Published on: February 27, 2016

Turbulence effect on cloud radiation.

K Matsuda1, R Onishi, R Kurose

  • 1Department of Mechanical Engineering and Science, Advanced Research Institute of Fluid Science and Engineering, Kyoto University, Kyoto 606-8501, Japan.

Physical Review Letters
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

Turbulent clustering of water droplets creates void regions, increasing light transmittance. This effect diminishes with higher turbulence and is negligible in real clouds.

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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
10:53

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

Published on: March 12, 2019

Related Experiment Videos

Last Updated: May 18, 2026

Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
13:02

Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow

Published on: February 27, 2016

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
10:53

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

Published on: March 12, 2019

Area of Science:

  • Fluid dynamics
  • Radiative transfer
  • Cloud physics

Background:

  • Turbulent fluid motion significantly impacts particle distribution.
  • Understanding droplet clustering is crucial for accurate radiative transfer models in clouds.

Purpose of the Study:

  • To investigate the influence of turbulent clustering of water droplets on radiative transfer.
  • To quantify the impact of void formation on direct transmittance.

Main Methods:

  • Employed three-dimensional direct numerical simulation (DNS) for particle-laden homogeneous isotropic turbulence.
  • Utilized a Monte Carlo photon tracing method for radiative transfer simulation.

Main Results:

  • Turbulent clustering leads to droplet-free regions, enhancing direct light transmittance.
  • The observed increase in transmittance decreases as the turbulent Reynolds number rises.

Conclusions:

  • The effect of turbulent clustering on radiative transfer is significant in simulations but diminishes with increasing Reynolds number.
  • This clustering-induced transmittance increase is likely negligible under realistic cloud conditions.