Turbulent stress measurements with phase-contrast magnetic resonance through tilted slices

Aiming at turbulent measurements in opaque suspensions, a simplistic methodology for measuring the turbulent stresses with phase-contrast magnetic resonance velocimetry is described. The method relies on flow-compensated and flow-encoding protocols with the flow encoding gradient normal to the slice...

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Vydáno v:Experiments in fluids Ročník 58; číslo 5; s. 1 - 12
Hlavní autoři: MacKenzie, Jordan, Söderberg, Daniel, Swerin, Agne, Lundell, Fredrik
Médium: Journal Article
Jazyk:angličtina
Vydáno: Berlin/Heidelberg Springer Berlin Heidelberg 01.05.2017
Springer Nature B.V
Témata:
Data treatment
Direct numerical simulation
Encoding (symbols)
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Fluid- and Aerodynamics
Heat and Mass Transfer
Internet protocols
Magnetic resonance
Magnetic resonance imaging
On flow
Phase-contrast magnetic resonances
Research Article
Reynolds shear stress
Shear flow
Shear stress
Spatial averaging
Stream-wise velocities
Stress measurement
Turbulence
Turbulent measurements
Turbulent stress
Velocimetry
Turbulent Stress
Covariance Component
Particle Image Velocimetry
Direct Numerical Simulation
Direct Numerical Simulation Data
ISSN:0723-4864, 1432-1114, 1432-1114
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Shrnutí:Aiming at turbulent measurements in opaque suspensions, a simplistic methodology for measuring the turbulent stresses with phase-contrast magnetic resonance velocimetry is described. The method relies on flow-compensated and flow-encoding protocols with the flow encoding gradient normal to the slice. The experimental data is compared with direct numerical simulations (DNS), both directly but also, more importantly, after spatial averaging of the DNS data that resembles the measurement and data treatment of the experimental data. The results show that the most important MRI data (streamwise velocity, streamwise variance and Reynolds shear stress) is reliable up to at least r ¯ = 0.75 without any correction, paving the way for dearly needed turbulence and stress measurements in opaque suspensions.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 14
ISSN:0723-4864
1432-1114
1432-1114
DOI:10.1007/s00348-017-2328-8