TY - JOUR

T1 - Stratified-to-annular transition in a horizontal pipe for different liquids

AU - Zdornikov, Semyon

AU - Isaenkov, Sergey

AU - Cherdantsev, Andrey

N1 - Zdornikov S. A., Isaenkov S. V., Cherdantsev A. V. Stratified-to-annular transition in a horizontal pipe for different liquids / S. A. Zdornikov, S. V. Isaenkov, A. V. Cherdantsev // Journal of Flow Visualization and Image Processing. - 2025. - Т. 32, № 4. - С. 19-27. DOI 10.1615/JFlowVisImageProc.2024057323

PY - 2024/1/17

Y1 - 2024/1/17

N2 - Low liquid loading gas−liquid flow in a horizontal pipe may follow either a stratified or annular flow pattern. Transition to annular flow requires liquid lifting up the pipe walls. Here we directly observe the process of liquid lifting as initially stratified flow develops downstream. Spatiotemporally resolved measurements of the height of the liquid lifting are carried out using the visualization technique with background image. The experiments were carried out in a wide range of gas and liquid flow rates for liquids with different viscosity and surface tension. The analysis was performed separately for annular flow conditions and for two transitional regimes, where different mechanisms of liquid lifting dominate. It was observed that reduction of surface tension always facilitates the transition. The effect of viscosity is less trivial; it dampens the wave-related liquid lifting but facilitates lifting due to secondary flows. Deep in the regime area of annular flow, the liquid lifting occurs promptly, and the liquid properties exert only minor effects.

AB - Low liquid loading gas−liquid flow in a horizontal pipe may follow either a stratified or annular flow pattern. Transition to annular flow requires liquid lifting up the pipe walls. Here we directly observe the process of liquid lifting as initially stratified flow develops downstream. Spatiotemporally resolved measurements of the height of the liquid lifting are carried out using the visualization technique with background image. The experiments were carried out in a wide range of gas and liquid flow rates for liquids with different viscosity and surface tension. The analysis was performed separately for annular flow conditions and for two transitional regimes, where different mechanisms of liquid lifting dominate. It was observed that reduction of surface tension always facilitates the transition. The effect of viscosity is less trivial; it dampens the wave-related liquid lifting but facilitates lifting due to secondary flows. Deep in the regime area of annular flow, the liquid lifting occurs promptly, and the liquid properties exert only minor effects.

KW - liquid lifting

KW - background image

KW - Visualization

KW - Horizontal pipe

KW - annular flow

UR - https://www.mendeley.com/catalogue/20c6eeca-89be-38c5-a43d-70f9500278d2/

UR - https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105018297498&origin=inward

U2 - 10.1615/jflowvisimageproc.2024057323

DO - 10.1615/jflowvisimageproc.2024057323

M3 - Article

VL - 32

SP - 19

EP - 27

JO - Journal of Flow Visualization and Image Processing

JF - Journal of Flow Visualization and Image Processing

SN - 1065-3090

IS - 4

ER -