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Collisions among el...
Collisions among elongated settling particles: The twofold role of turbulence
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- Grujić, Anđela (författare)
- KTH,Strömningsmekanik och Teknisk Akustik,SeRC - Swedish e-Science Research Centre,Linné Flow Center, FLOW,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)
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- Bhatnagar, Akshay (författare)
- KTH,Strömningsmekanik och Teknisk Akustik,SeRC - Swedish e-Science Research Centre,Linné Flow Center, FLOW,Department of Physics, Indian Institute of Technology Palakkad, Palakkad 678 557, India,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH),Indian Institute of Technology
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- Sardina, Gaetano, 1982 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology,Department of Mechanical and Maritime Sciences, Chalmers University of Technology, 412 96 Gothenburg, Sweden
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- Brandt, Luca (författare)
- KTH,Linné Flow Center, FLOW,SeRC - Swedish e-Science Research Centre,Strömningsmekanik och Teknisk Akustik,Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, Norway,Norges teknisk-naturvitenskapelige universitet (NTNU),Norwegian University of Science and Technology (NTNU),Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)
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(creator_code:org_t)
- AIP Publishing, 2024
- 2024
- Engelska.
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Ingår i: Physics of Fluids. - : AIP Publishing. - 1089-7666 .- 1070-6631. ; 36:1
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https://research.cha... (primary) (free)
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https://doi.org/10.1...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- We study the collision rates of settling spheres and elongated spheroids in homogeneous, isotropic turbulence by means of direct numerical simulations aiming to understand microscale-particle encounters in oceans and lakes. We explore a range of aspect ratios and sizes relevant to the dynamics of plankton and microplastics in water environments. The results presented here confirm that collision rates between elongated particles in a quiescent fluid are more frequent than those among spherical particles in turbulence due to oblique settling. We also demonstrate that turbulence generally enhances collisions among elongated particles as compared to those expected for a random distribution of the same particles settling in a quiescent fluid, although we also find a decrease in collision rates in turbulence for particles of the highest density and moderate aspect ratios ( A = 5 ) . The increase in the collision rate due to turbulence is found to quickly decrease with aspect ratio, reach a minimum for aspect ratios approximately equal to 5, and then slowly increase again, with an increase up to 50% for the largest aspect ratios investigated. This non-monotonic trend is explained as the result of two competing effects: the increase in the surface area with aspect ratio (beneficial to increase encounter rates) and the alignment of nearby prolate particles in turbulence (reducing the probability of collision). Turbulence mixing is, therefore, partially balanced by rod alignment at high particle aspect ratios.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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