Measurements of cross-sectional instantaneous phase distribution in gas–liquid pipe flow

Elongated bubble shape in inclined air-water slug flow

“…The spatial resolution of the instrument in the pipe cross-section is therefore supposed to be of the order of the grid spacing ( Richter et al 2002 ). In the present work the spatial resolution of the recorded cross-sectional phase distributions was improved by applying a processing method suggested in Roitberg et al (2007) . In this approach, partial contributions of the neighboring junctions are taken into account in computing the shape of the instantaneous cross sectional phase interface.…”

An electrical impedance sensor for water level measurements in air–water two-phase stratified flows

“…Also, Wojtan et al (2005) adopted a similar technique for void fraction measurements in stratified flows. Roitberg et al (2007) measured interfacial structures of stratified flows using a wire mesh sensor and compared its performances with those from a borescope installed inside the flow field. Devia and Fossa (2003) used conductance responses differently induced by void fractions.…”

Estudo topológico de escoamento trifásico óleo-água-ar através de sensor de impedância de resposta rápida do tipo <i>\"wire-mesh\"</i>

“…Foi introduzido por Prasser et al (1998) no Centro de Pesquisa de Dresden-Rossendorf (FZD) na Alemanha. Dessa data em diante, tem sido utilizado por vários pesquisadores para o estudo de escoamentos multifásicos, principalmente em escoamento gás-líquido (PRASSER et al, 1998;ROITBERG et al, 2007;PIETRUSKE;PRASSER 2007;DA SILVA et al, 2009;DA SILVA et al, 2010;HAMPEL et al, 2009e AZZOPARDI et al, 2010, com algumas aplicações em escoamento líquido-líquido (LLAMAS et al, 2008;DA SILVA et al, 2011.…”