TY - JOUR

T1 - Experimental and numerical study of formation and development of disturbance waves in annular gas-liquid flow

AU - Fan, Wenyuan

AU - Cherdantsev, Andrey V.

AU - Anglart, Henryk

PY - 2020/9/15

Y1 - 2020/9/15

N2 - Disturbance waves in a downwards annular gas-liquid flow were investigated experimentally and numerically in this study. In the experiment, the brightness-based laser-induced fluorescence (BBLIF) technique was utilized to obtain high-resolution spatiotemporal measurements for the film thickness. In the simulations, the two-phase system was simulated by the volume of fluid (VOF) method together with newly developed turbulence damping models, without which the turbulence level around the film surface is considerably under-predicted. Qualitative and quantitative comparisons were carried out for the experimental and numerical data, during which a novel method was developed to extract complex wave structures in a direct manner. Comparisons showed that the model is able to reproduce the main stages of flow evolution, including development of high-frequency initial waves, their coalesce into stable large-scale disturbance waves, generation of slow and fast ripples, and disruption of fast ripples into droplets. The main properties of modeled waves are in decent agreement with the measured ones, apart from noticeably rarer generation of ripples. The presented methods offer a new and promising option to model various energy technology systems, where annular two-phase flow occurs.

AB - Disturbance waves in a downwards annular gas-liquid flow were investigated experimentally and numerically in this study. In the experiment, the brightness-based laser-induced fluorescence (BBLIF) technique was utilized to obtain high-resolution spatiotemporal measurements for the film thickness. In the simulations, the two-phase system was simulated by the volume of fluid (VOF) method together with newly developed turbulence damping models, without which the turbulence level around the film surface is considerably under-predicted. Qualitative and quantitative comparisons were carried out for the experimental and numerical data, during which a novel method was developed to extract complex wave structures in a direct manner. Comparisons showed that the model is able to reproduce the main stages of flow evolution, including development of high-frequency initial waves, their coalesce into stable large-scale disturbance waves, generation of slow and fast ripples, and disruption of fast ripples into droplets. The main properties of modeled waves are in decent agreement with the measured ones, apart from noticeably rarer generation of ripples. The presented methods offer a new and promising option to model various energy technology systems, where annular two-phase flow occurs.

KW - Annular flow

KW - BBLIF

KW - Disturbance waves

KW - Turbulence damping

KW - VOF

KW - STATISTICAL CHARACTERISTICS

KW - 2-PHASE FLOW

KW - DROPLET ENTRAINMENT

KW - HEAT-TRANSFER

KW - MECHANISM

KW - INTERFACIAL WAVES

KW - AIR-WATER

KW - LARGE-EDDY SIMULATION

KW - FILM THICKNESS

KW - THIN

UR - http://www.scopus.com/inward/record.url?scp=85087996251&partnerID=8YFLogxK

U2 - 10.1016/j.energy.2020.118309

DO - 10.1016/j.energy.2020.118309

M3 - Article

AN - SCOPUS:85087996251

VL - 207

JO - Energy

JF - Energy

SN - 0360-5442

M1 - 118309

ER -