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Universal Scaling L...
Universal Scaling Laws for Dense Particle Suspensions in Turbulent Wall-Bounded Flows
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Costa, Pedro (författare)
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Picano, Francesco (författare)
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- Brandt, Luca (författare)
- KTH,Mekanik,SeRC - Swedish e-Science Research Centre,Linné Flow Center, FLOW
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Breugem, Wim-Paul (författare)
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(creator_code:org_t)
- American Physical Society, 2016
- 2016
- Engelska.
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Ingår i: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 117:13
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The macroscopic behavior of dense suspensions of neutrally buoyant spheres in turbulent plane channel flow is examined. We show that particles larger than the smallest turbulence scales cause the suspension to deviate from the continuum limit in which its dynamics is well described by an effective suspension viscosity. This deviation is caused by the formation of a particle layer close to the wall with significant slip velocity. By assuming two distinct transport mechanisms in the near-wall layer and the turbulence in the bulk, we define an effective wall location such that the flow in the bulk can still be accurately described by an effective suspension viscosity. We thus propose scaling laws for the mean velocity profile of the suspension flow, together with a master equation able to predict the increase in drag as a function of the particle size and volume fraction.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- Particle size
- Spheres
- Turbulence
- Viscosity
- Wall flow
- Continuum limits
- Macroscopic behaviors
- Mean velocity profiles
- Suspension viscosity
- Transport mechanism
- Turbulent plane channel flow
- Turbulent wall-bounded flows
- Universal scaling laws
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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