Aerodynamic generation of electric fields in turbulence laden with charged inertial particles.

Abstract:

:Self-induced electricity, including lightning, is often observed in dusty atmospheres. However, the physical mechanisms leading to this phenomenon remain elusive as they are remarkably challenging to determine due to the high complexity of the multi-phase turbulent flows involved. Using a fast multi-pole method in direct numerical simulations of homogeneous turbulence laden with hundreds of millions of inertial particles, here we show that mesoscopic electric fields can be aerodynamically created in bi-disperse suspensions of oppositely charged particles. The generation mechanism is self-regulating and relies on turbulence preferentially concentrating particles of one sign in clouds while dispersing the others more uniformly. The resulting electric field varies over much larger length scales than both the mean inter-particle spacing and the size of the smallest eddies. Scaling analyses suggest that low ambient pressures, such as those prevailing in the atmosphere of Mars, increase the dynamical relevance of this aerodynamic mechanism for electrical breakdown.

journal_name

Nat Commun

journal_title

Nature communications

authors

Di Renzo M,Urzay J

doi

10.1038/s41467-018-03958-7

subject

Has Abstract

pub_date

2018-04-26 00:00:00

pages

1676

issue

1

issn

2041-1723

pii

10.1038/s41467-018-03958-7

journal_volume

9

pub_type

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