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Related Experiment Videos

Ultrasonically triggered ignition at liquid surfaces.

Lars Hendrik Simon1, Lennart Meyer1, Volker Wilkens1

  • 1Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany.

Ultrasonics Sonochemistry
|July 29, 2014
PubMed
Summary
This summary is machine-generated.

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International standards consider ultrasound an ignition source, but this study experimentally verifies conditions for ultrasound-induced explosions in explosive atmospheres. Findings suggest the current safety threshold may be significantly increased.

Area of Science:

  • Acoustics
  • Explosion Safety
  • Industrial Safety

Background:

  • Ultrasound is classified as an ignition source by international standards, with a threshold of 1mW/mm(2).
  • This threshold is based on theoretical estimations lacking experimental validation, suggesting a potentially large safety margin.
  • Ultrasound's use in industrial settings with explosive atmospheres necessitates understanding its ignition potential.

Purpose of the Study:

  • To experimentally investigate the ignition potential of ultrasound in explosive atmospheres.
  • To determine the conditions under which ultrasound can trigger an explosion.
  • To evaluate the reasonableness of the current international safety threshold for ultrasound.

Main Methods:

  • Focused ultrasound was coupled into a liquid medium.
Keywords:
Focused ultrasoundIgnition sourceUltrasonic bath

Related Experiment Videos

  • A target at the liquid's surface converted acoustic energy into a hot spot.
  • Ignition tests were conducted to identify necessary conditions for explosion.

    • Main Results:

    • Focused ultrasound can ignite explosive atmospheres when acoustic energy is converted to a hot spot via a target.
    • Experimental ignition tests established specific conditions required for an ultrasonically triggered explosion.
    • The findings indicate that the current international threshold value for ultrasound ignition can be significantly increased.

    Conclusions:

    • The experimental verification confirms that ultrasound, under specific conditions, can ignite explosive atmospheres.
    • The derived conditions for ultrasonic ignition suggest the existing safety threshold is conservative.
    • This research provides a basis for revising ultrasound safety standards in industrial applications involving explosive atmospheres.