Structure of vertical downward bubbly flow

Abstract In view of the great importance to two-fluid model, structure of downward bubbly flows in vertical pipes has been discussed intensively based on available data sets of local flow parameters including extensive air–water data sets recently measured by the authors. In this study, an approximate radial phase distribution pattern map has been proposed based on available data sets, and radial profiles of local flow parameters such as void fraction, interfacial area concentration, interfacial velocity, and bubble Sauter mean diameter have been discussed in detail. The one-dimensional drift-flux model for a downward two-phase flow and the correlation of the interfacial area concentration have been compared with the downward flow data. The correlations applicable to the predictions of one-dimensional void fraction and interfacial area concentration for a downward bubbly flow have been recommended by the comparison.

[1]  M. Ishii,et al.  Distribution parameter and drift velocity of drift-flux model in bubbly flow , 2002 .

[2]  Mamoru Ishii,et al.  Development of the Miniaturized Four-sensor Conductivity Probe and the Signal Processing Scheme , 2000 .

[3]  Hidesada Tamai,et al.  Transverse migration of single bubbles in simple shear flows , 2002 .

[4]  Mamoru Ishii,et al.  Axial development of interfacial area and void concentration profiles measured by double-sensor probe method , 1995 .

[5]  M. E. Charles,et al.  Vertical two-phase flow part I. Flow pattern correlations , 1974 .

[6]  Mamoru Ishii,et al.  Experimental study on interfacial area transport in bubbly two-phase flows , 1999 .

[7]  R. Lockhart.  Proposed Correlation of Data for Isothermal Two-Phase, Two-Component Flow in Pipes , 1949 .

[8]  Xinyu Fu.  Interfacial area measurement and transport modeling in air -water two -phase flow , 2001 .

[9]  O. N. Kashinsky,et al.  Downward bubbly gas–liquid flow in a vertical pipe , 1999 .

[10]  G. Kocamustafaogullari,et al.  Measurement and modeling of average void fraction, bubble size and interfacial area , 1994 .

[11]  N. Afgan.  Transient phenomena in multiphase flow , 1988 .

[12]  N. Zuber,et al.  Drag coefficient and relative velocity in bubbly, droplet or particulate flows , 1979 .

[13]  M. Ishii,et al.  One-dimensional drift-flux model and constitutive equations for relative motion between phases in various two-phase flow regimes , 2003 .

[14]  J. Flaherty,et al.  Analysis of phase distribution in fully developed laminar bubbly two-phase flow , 1991 .

[15]  Mamoru Ishii,et al.  Interfacial area concentration of bubbly flow systems , 2002 .

[16]  M. Ishii,et al.  Local Flow Measurements of Vertical Upward Bubbly Flow in an Annulus , 2003 .

[17]  Kazuo Sato,et al.  Vertically Downward Two-Phase Flow, (I): Void Distribution and Average Void Fraction , 1989 .

[18]  Mamoru Ishii,et al.  Development of one-group interfacial area transport equation in bubbly flow systems , 2002 .

[19]  O. C. Jones,et al.  3-D turbulence structure and phase distribution measurements in bubbly two-phase flows , 1987 .

[20]  Claudie Grossetete.  Caractérisation expérimentale et simulations de l'évolution d'un écoulement diphasique à bulles ascendant dans une conduite verticale , 1995 .

[21]  M. Ishii,et al.  Axial interfacial area transport of vertical bubbly flows , 2001 .