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Investigations on bubbly two-phase flow in a constricted vertical pipe

Neumann-Kipping, M.; Bieberle, A.; Hampel, U.

We report on an experimental investigation of adiabatic bubbly two-phase flow development in a DN50 pipe with a ring-shaped and a baffle-shaped constriction at different superficial velocities of gas (up to jg = 0.1400 m·s-1) and liquid (up to jl = 1.6110 m·s-1) using ultrafast electron beam X-ray computed tomography (UFXCT). From UFXCT images, cross-sectional gas holdup distributions were obtained with a temporal resolution of up to 2,500 frames per second in 18 scanning planes along the pipe. A sophisticated data processing approach was applied to extract gas holdup data immediately from the two-phase flow image stack. Based on that, time-averaged gas holdup of the cross-section and the axial center of the pipe were calculated. In addition, bubble sizes and velocities were determined.

Keywords: gas-liquid two-phase flow; bubbly flow; flow constriction; three-dimensional flow; computed tomography; experimental benchmark data

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Permalink: https://www.hzdr.de/publications/Publ-30464
Publ.-Id: 30464