Vertical, upward gas-liquid two-phase flow across a tube bundle

Investigation of flow phenomena in a kettle reboiler

“…Kondo and Nakajima [17] tested several heat-exchanger configurations with air-water mixtures and found that the flow regime boundaries depended only on the gas superficial velocity, but the flow rates they used were small. Ulbrich and Mewes [18] pointed out that the range of data used in the formation of the map of Grant and Chisholm [23] was limited and that only air-water data was used, so that the ordinate system had not been verified for other fluids. Their flow map used a larger range of air-water data.…”

“…The one-dimensional model described in Section 2 was used to determine the vertical mass flux in the column. The flow pattern transition from bubbly to intermittent flow is significantly controlled by the superficial vapour velocity [17][18][19][20]. The 1.5DT model assumes that bubbly flow exists until a critical superficial gas velocity is achieved and proceeds as an intermittent flow thereafter.…”

“…Their flow map used a larger range of air-water data. Grant and Chisholm [23] and Ulbrich and Mewes [18] used visual observations to determine their flow maps. Noghrehkar et al [19] used a void probe method to determine theirs and produced air-water data covering a still larger range.…”

Modelling Two-Phase Flow-Excited Damping and Fluidelastic Instability in Tube Arrays

“…The solid lines in Figure 7 represent transition boundaries determined by Ulbrich & Mewes (1994), who performed an exhaustive analysis of available flow regime data in vertical two-phase cross-flow through horizontal tube bundles. They found that the flow patterns observed and those plotted on the traditionally used maps of Taitel et al (1980) and Grant & Murray (1972), showed only a 46 and 50% rate of agreement, respectively.…”

Dynamics of an in-Line Tube Array Subjected to Steam–water Cross-Flow. Part I: Two-Phase Damping and Added Mass

“…APPENDIX A Flow patterns for #ow across tube arrays are as yet not fully identi"ed. For air}water #ow, however, some recent excellent work by Ulbrich and Mewes (1994) has made it possible to determine transition boundaries with reasonable certainty. Freon two-phase #ow data were also considered.…”