Measurement of turbulence statistics in single-phase and two-phase flows using ultrasound imaging velocimetry

Arati Gurung, Christian Poelma

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)
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Abstract

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.

Original languageEnglish
Article number171
Number of pages12
JournalExperiments in Fluids: experimental methods and their applications to fluid flow
Volume57
Issue number11
DOIs
Publication statusPublished - 2016

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