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

Two novel complementing methods that enable experimental study of gas and liquid phases distribution in two-phase pipe flow are considered. The first measuring technique uses a wire-mesh sensor that, in addition to providing data on instantaneous phase distribution in the pipe cross-section, also allows measuring instantaneous propagation velocities of the phase interface. A novel algorithm for processing the wire-mesh sensor data is suggested to determine the instantaneous boundaries of gas–liquid interface. The second method applied here takes advantage of the existence of sharp visible boundaries between the two phases. This optical instrument is based on a borescope that is connected to a digital video camera. Laser light sheet illumination makes it possible to obtain images in the illuminated pipe cross-section only. It is demonstrated that the wire-mesh-derived results based on application of the new algorithm improve the effective spatial resolution of the instrument and are in agreement with those obtained using the borescope. Advantages and limitations of both measuring techniques for the investigations of cross-sectional instantaneous phase distribution in two-phase pipe flows are discussed.

[1]  M. Aritomi,et al.  Intrusive Effect of Wire Mesh Tomography on Gas-liquid Flow Measurement , 2003 .

[2]  Panagiota Angeli,et al.  Drop size distributions in horizontal oil-water dispersed flows , 2000 .

[3]  Yehuda Taitel,et al.  Film thickness in horizontal annular flow , 1983 .

[4]  R. van Hout,et al.  Evolution of statistical parameters of gas–liquid slug flow along vertical pipes , 2001 .

[5]  H. Prasser,et al.  A new electrode-mesh tomograph for gas–liquid flows , 1998 .

[6]  R. Hampel,et al.  Approach towards spatial phase reconstruction in transient bubbly flow using a wire-mesh sensor , 2002 .

[7]  S. Zaleski,et al.  Volume-of-Fluid Interface Tracking with Smoothed Surface Stress Methods for Three-Dimensional Flows , 1999 .

[8]  Hiroshige Kikura,et al.  A study of non-symmetric air water flow using wire mesh sensor , 2005 .

[9]  H. Lemonnier,et al.  Is 2D impedance tomography a reliable technique for two-phase flow? , 1998 .

[10]  Void fraction measurements in vertical slug flow: applications to slug characteristics and transition , 1989 .

[11]  Lev Shemer,et al.  Application of a borescope to studies of gas-liquid flow in downward inclined pipes , 2006 .

[12]  A. Dukler,et al.  A model for predicting flow regime transitions in horizontal and near horizontal gas‐liquid flow , 1976 .

[13]  L. Shemer,et al.  Evolution of hydrodynamic and statistical parameters of gas-liquid slug flow along inclined pipes , 2003 .

[14]  John R. Thome,et al.  Measurement of dynamic void fractions in stratified types of flow , 2005 .

[15]  S. Zaleski,et al.  Interface reconstruction with least‐square fit and split Eulerian–Lagrangian advection , 2003 .

[16]  Sailesh Kumar,et al.  A γ-ray tomographic scanner for imaging voidage distribution in two-phase flow systems , 1995 .

[17]  R. van Hout,et al.  Translational velocities of elongated bubbles in continuous slug flow , 2002 .

[18]  A. Kendoush,et al.  Void fraction measurement by X-ray absorption , 2002 .