caa a22 4500 606198555 CHVBK 20210128100934.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s00348-015-1962-2 doi (NATIONALLICENCE)springer-10.1007/s00348-015-1962-2 Accurate velocity measurements of boundary-layer flows using Doppler optical coherence tomography [Elektronische Daten] [Sanna Haavisto, Juha Salmela, Antti Koponen] 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. Springer-Verlag Berlin Heidelberg, 2015 Haavisto Sanna Spinnova Ltd., Jyväskylä, Finland aut Salmela Juha Spinnova Ltd., Jyväskylä, Finland aut Koponen Antti VTT Technical Research Centre of Finland, P.O. Box 1603, 40401, Jyväskylä, Finland aut Experiments in Fluids Springer Berlin Heidelberg 56/5(2015-05-01), 1-6 0723-4864 56:5<1 2015 56 348 https://doi.org/10.1007/s00348-015-1962-2 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 review-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-1962-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Haavisto Sanna Spinnova Ltd., Jyväskylä, Finland aut NATIONALLICENCE 700 1- Salmela Juha Spinnova Ltd., Jyväskylä, Finland aut NATIONALLICENCE 700 1- Koponen Antti VTT Technical Research Centre of Finland, P.O. Box 1603, 40401, Jyväskylä, Finland aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/5(2015-05-01), 1-6 0723-4864 56:5<1 2015 56 348