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Small-scale clustering of nano-dust grains in supersonic turbulence
KTH Royal Inst Technol, Nordita, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden..
Vibenshuset, Cosm Dawn Ctr DAWN, Lyngbyvej 2, DK-2100 Copenhagen, Denmark.;Niels Bohr Inst, Lyngbyvej 2, DK-2100 Copenhagen, Denmark..
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.ORCID iD: 0000-0002-2335-6574
2019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 490, no 4, p. 5788-5797Article in journal (Refereed) Published
Abstract [en]

We investigate the clustering and dynamics of nano-sized particles (nano dust) in high-resolution (10243) simulations of compressible isothermal hydrodynamic turbulence. It is well established that large grains will decouple from a turbulent gas flow, while small grains will tend to trace the motion of the gas. We demonstrate that nano-sized grains may cluster in a turbulent flow (fractal small-scale clustering), which increases the local grain density by at least a factor of a few. In combination with the fact that nano-dust grains may be abundant in general, and the increased interaction rate due to turbulent motions, aggregation involving nano dust may have a rather high probability. Small-scale clustering will also affect extinction properties. As an example we present an extinction model based on silicates, graphite, and metallic iron, assuming strong clustering of grain sizes in the nanometre range, could explain the extreme and rapidly varying ultraviolet extinction in the host of GRB 140506A.

Place, publisher, year, edition, pages
OXFORD UNIV PRESS , 2019. Vol. 490, no 4, p. 5788-5797
Keywords [en]
hydrodynamics, turbulence, ISM: clouds, dust, extinction
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-266518DOI: 10.1093/mnras/stz2957ISI: 000504000300098OAI: oai:DiVA.org:kth-266518DiVA, id: diva2:1391715
Note

QC 20200205

Available from: 2020-02-05 Created: 2020-02-05 Last updated: 2020-02-05Bibliographically approved

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Villarroel-Schneider, Jhonny

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