TY - JOUR

T1 - Influence of Surfactants in Low Concentrations on Bubble Rising Velocity in Inclined Channel

AU - Vorobyev, M. A.

AU - Karhov, A. O.

N1 - Vorobyev, M. A. Influence of Surfactants in Low Concentrations on Bubble Rising Velocity in Inclined Channel / M. A. Vorobyev, A. O. Karhov // Journal of Engineering Thermophysics. – 2026. – Vol. 35, No. 1. – P. 54-60. – DOI 10.1134/S1810232826010066. – EDN DAMMXU. Research was supported by the Russian Science Foundation (grant no. 24-21-20023, https://www.rscf.ru/project/24-21-20023/) and financed by the administration of the Novosibirsk region (agreement no. р-90 dated 22.03.2024).

PY - 2026/9/4

Y1 - 2026/9/4

N2 - This paper presents the results of an experimental study of the effect of surfactant on the motion characteristics of bubbles in a stagnant liquid within an inclined pipe. The measurements were performed in a round pipe with an inner diameter of 32 mm at gas flow rates of 3, 5, and 8 ml/min and pipe inclination angles of 30–60◦. The bubble characteristics were determined using shadow photography processing of the bubbly flow. Distributions of bubble sizes and their rising velocities were obtained as functions of the pipe inclination angle and the distance from the gas injection point to the measurement location. The addition of surfactants significantly reduced the probability of bubble coalescence upon collision, causing bubbles to form clusters. During cluster motion, bubbles in the core move slightly faster, while those at the periphery travel slower, enabling circulatory motion within the cluster. Larger bubbles also become entrained in this circulatory motion. Consequently, the rising velocity of bubbles becomes independent of their size and is governed by the group rising velocity of the bubble cluster.

AB - This paper presents the results of an experimental study of the effect of surfactant on the motion characteristics of bubbles in a stagnant liquid within an inclined pipe. The measurements were performed in a round pipe with an inner diameter of 32 mm at gas flow rates of 3, 5, and 8 ml/min and pipe inclination angles of 30–60◦. The bubble characteristics were determined using shadow photography processing of the bubbly flow. Distributions of bubble sizes and their rising velocities were obtained as functions of the pipe inclination angle and the distance from the gas injection point to the measurement location. The addition of surfactants significantly reduced the probability of bubble coalescence upon collision, causing bubbles to form clusters. During cluster motion, bubbles in the core move slightly faster, while those at the periphery travel slower, enabling circulatory motion within the cluster. Larger bubbles also become entrained in this circulatory motion. Consequently, the rising velocity of bubbles becomes independent of their size and is governed by the group rising velocity of the bubble cluster.

KW - bubble rising velocity

KW - bubbly flows

KW - inclined channel

KW - surfactants

KW - Пузырьковые потоки

KW - поверхностно-активные вещества

KW - скорость подъема пузырьков

KW - наклонный канал

UR - https://www.mendeley.com/catalogue/45118057-7117-36a2-abe2-7aaefeb33bd4/

UR - https://www.scopus.com/pages/publications/105049407541

UR - https://elibrary.ru/item.asp?id=92021698

U2 - 10.1134/S1810232826010066

DO - 10.1134/S1810232826010066

M3 - Article

VL - 35

SP - 54

EP - 60

JO - Journal of Engineering Thermophysics

JF - Journal of Engineering Thermophysics

SN - 1810-2328

IS - 1

ER -