Description
IJMF Spotlight V- Seminar Series: Seeing the unseen: X-ray diagnostics for multiphase flowsIJMF Spotlight V- Seminar Series 2023. ABSTRACT: Multiphase flows present particular challenges for the experimentalist. Gas-liquid interfaces cause multiple-scattering and refraction of visible light, leading to high optical density. This makes it difficult to probe the interior of a dense spray, bubbly or cavitating flow. Temperature gradients (evaporative and combusting flows) cause beam-steering which interfere with measurements. X-ray techniques offer a potential solution to these problems. These have seen increasing use over recent decades due to the increased availability and brightness of X-ray sources. In particular, synchrotron light sources capable of producing focused, intense X-ray beams enable high temporal and spatial resolution measurements. X-ray diagnostics for multiphase flows span a range of techniques beyond simple transmission imaging. In this presentation a number of innovative applications of X-ray methods to multiphase flow problems are considered. The utility of X-ray fluorescence spectroscopy to identify phases and species in optically dense flows and opaque geometries such as cavitation inside high pressure spray nozzles is explored. Applications of ultra small angle X-ray scattering to the measurement of droplet size and composition in sprays is also considered, with applications in both fuel injection systems and multicomponent technical aerosols such as those found in medical inhalers.
Period | 7 Mar 2022 |
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Event type | Seminar |
Degree of Recognition | International |