Ultra Fast Electron Beam X-Ray CT for Two Phase Flow Phenomena

Abstract

Ultrafast electron beam X-ray CT is a fast imaging technique which can be used to vizualise phase distributions in transient two-phase flows. This is important e.g. in nuclear reactor thermal hydraulics where an optical access to the flow is not feasible. Ultrafast electron beam X-ray tomography achieves frame rates of several thousand slice images per second at ~ 1 mm spatial resolutionh. From data sets several parameters whic characterize the flow, such as radial gas fraction profiles or bubble size distributions, can be extracted. This paper introduces the tomography system and presents first results obtained for upward cocurrent air-water two-phase flow experiments at the TOPFLOW facility.