Evolution of the structure of a gas–liquid two-phase flow in a large vertical pipe

Benchmark database on the evolution of two-phase flows in a vertical pipe

“…Prasser et al, 1998Prasser et al, , 2001) and on experiments using the wire-mesh sensor (e.g. Prasser et al 2002, 2007b, Lucas et al 2005, 2007. One measuring plane of the sensor consists of two grids of parallel wires, which span over the measurement cross-section.…”

“…At relatively small void fractions, the pressure effect on the increase in bubble size can have a larger influence on the evolution of the bubble size distribution than coalescence and fragmentation. Prasser et al 2007b discuss which essential influence the bubble expansion may have on the bubble size distribution basing on experimental and numerical results.…”

Development and Validation of a Multifield Model of Churn-Turbulent Gas/Liquid Flows

“…As it was mentioned before, the experimental data used for the validation of the present model have been taken at the thermal-dynamic test facility TOPFLOW [Schaffrath et al, 2001;Prasser et al,2007] at the Institute of Safety Research of Forschungszentrum Rossendorf e.V. The name, TOPFLOW, is an acronym for transient TwO Phase FLOW.…”

Novel experimental measuring techniques required to provide data for CFD validation

“…To that end the so-called "variable gas injection system" at the TOPFLOW facility was constructed [13]. It is a 9 m tall vertical pipe of 200 mm nominal diameter, which is equipped with gas injection units at six different heights.…”

“…As shown in Fig. 10, the result of the lift force inverse according to Tomiyama [14] can be studied in a polydisperse bubbly flow (compare [13]). Small bubbles still form a wall peak, even when the total gas fraction profile has a central peak.…”