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 language | English |
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Article number | 96 |
Number of pages | 6 |
Journal | Experiments in Fluids |
Volume | 56 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2015 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Velocity Profile
- Optical Coherence Tomography
- Wall Shear Stress
- Skin Friction
- Scanning Frequency