Accurate velocity measurements of boundary-layer flows using Doppler optical coherence tomography

Sanna Haavisto, Juha Salmela, Antti Koponen

Research output: Contribution to journal › Article › Scientific › peer-review

6 Citations (Scopus)

Abstract

Pulsed ultrasound Doppler velocimetry and nuclear magnetic resonance imaging are popular non-invasive measurement methods for flows of opaque fluids. The spatial and temporal resolution of these methods, however, is quite limited, and they lack accuracy, especially close to solid boundaries. In this paper, we show that solution to these problems is achieved by using Doppler optical coherence tomography (DOCT). DOCT provides simultaneous information about the fluid structure and velocity with very high spatial and temporal resolution. For benchmarking of the method we use water as the reference fluid. We show how DOCT gives a very good agreement with theory for the velocity profile, skin friction and viscosity directly from the measurement signal. The velocity profile extends from the turbulent region to viscous sublayer, and viscosity of the fluid can be calculated also from a turbulent flow with a good accuracy. Overall, DOCT is seen to be very well suited for providing new insight into boundary-layer flows, rheology and skin friction.
Original languageEnglish
Article number96
Number of pages6
JournalExperiments in Fluids
Volume56
Issue number5
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Fingerprint

boundary layer flow
Boundary layer flow
Optical tomography
velocity measurement
Velocity measurement
tomography
skin friction
Skin friction
fluids
temporal resolution
Fluids
friction
velocity distribution
spatial resolution
Viscosity
viscosity
signal measurement
Benchmarking
Rheology
rheology

Keywords

  • Velocity Profile
  • Optical Coherence Tomography
  • Wall Shear Stress
  • Skin Friction
  • Scanning Frequency

Cite this

Haavisto, Sanna ; Salmela, Juha ; Koponen, Antti. / Accurate velocity measurements of boundary-layer flows using Doppler optical coherence tomography. In: Experiments in Fluids. 2015 ; Vol. 56, No. 5.
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abstract = "Pulsed ultrasound Doppler velocimetry and nuclear magnetic resonance imaging are popular non-invasive measurement methods for flows of opaque fluids. The spatial and temporal resolution of these methods, however, is quite limited, and they lack accuracy, especially close to solid boundaries. In this paper, we show that solution to these problems is achieved by using Doppler optical coherence tomography (DOCT). DOCT provides simultaneous information about the fluid structure and velocity with very high spatial and temporal resolution. For benchmarking of the method we use water as the reference fluid. We show how DOCT gives a very good agreement with theory for the velocity profile, skin friction and viscosity directly from the measurement signal. The velocity profile extends from the turbulent region to viscous sublayer, and viscosity of the fluid can be calculated also from a turbulent flow with a good accuracy. Overall, DOCT is seen to be very well suited for providing new insight into boundary-layer flows, rheology and skin friction.",
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Haavisto, S, Salmela, J & Koponen, A 2015, 'Accurate velocity measurements of boundary-layer flows using Doppler optical coherence tomography', Experiments in Fluids, vol. 56, no. 5, 96. https://doi.org/10.1007/s00348-015-1962-2

Accurate velocity measurements of boundary-layer flows using Doppler optical coherence tomography. / Haavisto, Sanna; Salmela, Juha; Koponen, Antti.

In: Experiments in Fluids, Vol. 56, No. 5, 96, 2015.

Research output: Contribution to journal › Article › Scientific › peer-review

TY - JOUR

T1 - Accurate velocity measurements of boundary-layer flows using Doppler optical coherence tomography

AU - Haavisto, Sanna

AU - Salmela, Juha

AU - Koponen, Antti

PY - 2015

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N2 - Pulsed ultrasound Doppler velocimetry and nuclear magnetic resonance imaging are popular non-invasive measurement methods for flows of opaque fluids. The spatial and temporal resolution of these methods, however, is quite limited, and they lack accuracy, especially close to solid boundaries. In this paper, we show that solution to these problems is achieved by using Doppler optical coherence tomography (DOCT). DOCT provides simultaneous information about the fluid structure and velocity with very high spatial and temporal resolution. For benchmarking of the method we use water as the reference fluid. We show how DOCT gives a very good agreement with theory for the velocity profile, skin friction and viscosity directly from the measurement signal. The velocity profile extends from the turbulent region to viscous sublayer, and viscosity of the fluid can be calculated also from a turbulent flow with a good accuracy. Overall, DOCT is seen to be very well suited for providing new insight into boundary-layer flows, rheology and skin friction.

AB - Pulsed ultrasound Doppler velocimetry and nuclear magnetic resonance imaging are popular non-invasive measurement methods for flows of opaque fluids. The spatial and temporal resolution of these methods, however, is quite limited, and they lack accuracy, especially close to solid boundaries. In this paper, we show that solution to these problems is achieved by using Doppler optical coherence tomography (DOCT). DOCT provides simultaneous information about the fluid structure and velocity with very high spatial and temporal resolution. For benchmarking of the method we use water as the reference fluid. We show how DOCT gives a very good agreement with theory for the velocity profile, skin friction and viscosity directly from the measurement signal. The velocity profile extends from the turbulent region to viscous sublayer, and viscosity of the fluid can be calculated also from a turbulent flow with a good accuracy. Overall, DOCT is seen to be very well suited for providing new insight into boundary-layer flows, rheology and skin friction.

KW - Velocity Profile

KW - Optical Coherence Tomography

KW - Wall Shear Stress

KW - Skin Friction

KW - Scanning Frequency

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Haavisto S, Salmela J, Koponen A. Accurate velocity measurements of boundary-layer flows using Doppler optical coherence tomography. Experiments in Fluids. 2015;56(5). 96. https://doi.org/10.1007/s00348-015-1962-2

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