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Understanding droplet collisions through a model flow: Insights from a Burgers vortex
Indian Inst Sci Educ & Res, Pune 411008, Maharashtra, India.;Tata Inst Fundamental Res, Int Ctr Theoret Sci, Bangalore 560089, Karnataka, India.;Univ Roma Tor Vergata, Dept Phys, Via Ric Sci 1, I-00133 Rome, Italy.;Univ Roma Tor Vergata, Ist Nazl Fis Nucl, Via Ric Sci 1, I-00133 Rome, Italy..
Tata Inst Fundamental Res, Int Ctr Theoret Sci, Bangalore 560089, Karnataka, India..
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, S-10691 Stockholm, Sweden..
Tata Inst Fundamental Res, Int Ctr Theoret Sci, Bangalore 560089, Karnataka, India..
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2019 (English)In: Physical review. E, ISSN 2470-0045, E-ISSN 2470-0053, Vol. 99, no 6, article id 063107Article in journal (Refereed) Published
Abstract [en]

We investigate the role of intense vortical structures, similar to those in a turbulent flow, in enhancing collisions (and coalescences) which lead to the formation of large aggregates in particle-laden flows. By using a Burgers vortex model, we show, in particular, that vortex stretching significantly enhances sharp inhomogeneities in spatial particle densities, related to the rapid ejection of particles from intense vortices. Furthermore our work shows how such spatial clustering leads to an enhancement of collision rates and extreme statistics of collisional velocities. We also study the role of polydisperse suspensions in this enhancement. Our work uncovers an important principle, which, if valid for realistic turbulent flows, may be a factor in how small nuclei water droplets in warm clouds can aggregate to sizes large enough to trigger rain.

Place, publisher, year, edition, pages
American Physical Society, 2019. Vol. 99, no 6, article id 063107
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Physical Sciences
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URN: urn:nbn:se:kth:diva-255309DOI: 10.1103/PhysRevE.99.063107ISI: 000473030200011Scopus ID: 2-s2.0-85068253957OAI: oai:DiVA.org:kth-255309DiVA, id: diva2:1340375
Note

QC 20190805

Available from: 2019-08-05 Created: 2019-08-05 Last updated: 2019-08-05Bibliographically approved

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