Structured and Fractal Smoke Patterns in a Simple Cavity

Amplitude and phase velocity measurements on the laminar oscillatory viscous boundary layer produced by acoustic waves are presented. The measurements were carried out in acoustic standing waves in air with frequencies of 68.5 and 114.5 Hz using laser Doppler anemometry and particle image velocimetry. The results obtained by these two techniques are in good agreement with the predictions made by the Rayleigh viscous boundary layer theory and confirm the existence of a local maximum of the velocity amplitude and its expected location.

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Experimental demonstration of the Rayleigh acoustic viscous boundary layer theory

Castrejón‐Pita

Huelsz

et al. 2006

Phys. Rev. E

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Structured and Fractal Smoke Patterns in a Simple Cavity

Abstract: While conducting a study with air in a simple closed rectangular cavity, we have discovered the formation of highly impressive, complex-structured, and symmetrical smoke density patterns. Using the box counting method the fractal characteristic of the patterns is demonstrated.

Cited by 1 publication

References 5 publications

Experimental demonstration of the Rayleigh acoustic viscous boundary layer theory

Experimental demonstration of the Rayleigh acoustic viscous boundary layer theory

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