TY - JOUR
T1 - Measurement of turbulence statistics in single-phase and two-phase flows using ultrasound imaging velocimetry
AU - Gurung, Arati
AU - Poelma, Christian
PY - 2016
Y1 - 2016
N2 - Ultrasound imaging velocimetry (UIV) has received considerable interest as a tool to measure in non-transparent flows. So far, studies have only reported statistics for steady flows or used a qualitative approach. In this study, we demonstrate that UIV has matured to a level where accurate turbulence statistics can be obtained. The technique is first validated in laminar and fully developed turbulent pipe flow (single-phase, with water as fluid) at a Reynolds number of 5300. The flow statistics agree with the literature data. Subsequently, we obtain similar statistics in turbulent two-phase flows at the same Reynolds number, by adding solid particles up to volume fraction of 3 %. In these cases, the medium is completely opaque, yet UIV provides useable data. The error in the measurements is estimated using an ad hoc approach at a volume load up to 10 %. For this case, the errors are approximately 1.9 and 0.3 % of the centerline velocity for the streamwise and radial velocity components, respectively. Additionally, it is demonstrated that it is possible to estimate the local concentration in stratified flows.
AB - Ultrasound imaging velocimetry (UIV) has received considerable interest as a tool to measure in non-transparent flows. So far, studies have only reported statistics for steady flows or used a qualitative approach. In this study, we demonstrate that UIV has matured to a level where accurate turbulence statistics can be obtained. The technique is first validated in laminar and fully developed turbulent pipe flow (single-phase, with water as fluid) at a Reynolds number of 5300. The flow statistics agree with the literature data. Subsequently, we obtain similar statistics in turbulent two-phase flows at the same Reynolds number, by adding solid particles up to volume fraction of 3 %. In these cases, the medium is completely opaque, yet UIV provides useable data. The error in the measurements is estimated using an ad hoc approach at a volume load up to 10 %. For this case, the errors are approximately 1.9 and 0.3 % of the centerline velocity for the streamwise and radial velocity components, respectively. Additionally, it is demonstrated that it is possible to estimate the local concentration in stratified flows.
UR - http://resolver.tudelft.nl/uuid:9ca9dcb3-cdd4-4957-b547-8652bd32b01a
UR - http://www.scopus.com/inward/record.url?scp=84992125733&partnerID=8YFLogxK
U2 - 10.1007/s00348-016-2266-x
DO - 10.1007/s00348-016-2266-x
M3 - Article
AN - SCOPUS:84992125733
SN - 0723-4864
VL - 57
JO - Experiments in Fluids: experimental methods and their applications to fluid flow
JF - Experiments in Fluids: experimental methods and their applications to fluid flow
IS - 11
M1 - 171
ER -