Measurement of acoustic velocity and attenuation of electrorheological fluids

The PK-4 laboratory consists of a direct current plasma tube into which microparticles are injected, forming a complex plasma. The microparticles acquire many electrons from the ambient plasma and are thus highly charged and interact with each other. If ion streams are present, wakes form downstream of the microparticles, which lead to an attractive term in the potential between the microparticles, triggering the appearance of microparticle strings and modifying the complex plasma into an electrorheological form. Here we report on a set of experiments on compressional waves in such a string fluid in the PK-4 laboratory during a parabolic flight and on board the International Space Station. We find a slowing of acoustic waves and hypothesize that the additional attractive interaction term leads to slower wave speeds than in complex plasmas with purely repulsive potentials. We test this hypothesis with simulations, and compare with theory.

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Slowing of acoustic waves in electrorheological and string-fluid complex plasmas

Schwabe

Khrapak

Zhdanov

et al. 2020

New J. Phys.

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Measurement of acoustic velocity and attenuation of electrorheological fluids

Cited by 1 publication

References 12 publications

Slowing of acoustic waves in electrorheological and string-fluid complex plasmas

Slowing of acoustic waves in electrorheological and string-fluid complex plasmas

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