Two-Phase Vertical Flow Maps

Abstract

In this paper a vertical downward flow map and a vertical upward flow map are presented. A comparison of the two flow maps shows that significant differences exist between the two directions of flow. The experimental work was performed with an air-water flow in a 11/2-in inside diameter transparent tube.

Liquid film thickness behaviour within a large diameter vertical 180° return bend

“…This result was confirmed by Chakrabati (1976) in a horizontal 180° bend, Anderson and Hills (1974) in an inverted U, Kooijman and Lacey (1968) and Maddock et al (1974) in 60 o to 90 o bends at the top of a vertical pipe. locations is justified by the conclusions drawn by Golan and Stenning (1969). They reported that the effect of the bend on phase distribution disappeared by 10 D downstream of the end of the bend for the inverted U-bend case.…”

“…Here, we focus on inverted U bends for which papers have been written by Golan and Stenning (1969), Hills (1973), Anderson and Hills (1974), Usui et al (1983), Hoang and Davies (1984), Takemura et al (1986). Golan and Stenning (1969) and Takemura et al (1986) who noted that they act as phase separators because of the combined effect of centrifugal forces and gravity. In a U bend the two forces act in the same direction, usually sending the liquid to the outside of the bend and gas to the inside.…”

“…Takemura et al (1986) confirmed these trends from wall temperature excursions in electrically heated experiments. Golan and Stenning (1969) reported that the effect of the bend on phase distribution disappeared by 10 pipe diameters downstream of the end of the bend for the inverted U-bend case and 4 pipe diameter for the U-bend. The two major applications of inverted U bends are steam generators (typical pipe diameter ~25 mm) and fired reboilers (typical pipe diameter 100-200 mm).…”

Twin-fluid atomization of viscous liquids: The effect of atomizer construction on breakup process, spray stability and droplet size

“…This can be estimated using theoretical flow regime maps (Barnea, 1987) or experimental ones (Baker, 1954;Hewitt and Roberts, 1969;Golan and Stenning, 1969). Theoretical maps have the advantage of not being limited by experimental parameters.…”

Análise e Estudo de Estabilidade do Padrão de Escoamento Golfadas Severas num Sistema Pipeline-Riser Acoplado ao VASPS

“…Golan e Stenning [59] observaram os padrões num tubo do tipo em U invertido consistido por um riser vertical seguido por um tubo descendente vertical. Martin [60] estudou a transição do padrão de escoamento em bolhas para o golfadas (slug flow) numa configuração vertical descendente, assim como foi estudado por Spedding e Nguyen [33].…”