Investigation of flow structures in vertical slug flow

Kawaji, Masahiro; DeJesus, J.M.; Tudose, G.T.

doi:10.1016/s0029-5493(97)00160-x

Cited by 66 publications

(24 citation statements)

References 25 publications

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“…The velocity pro®les are¯atter than the theoretical parabolic pro®les, which suggests that the¯ow in the ®lm remains undeveloped at the axial locations of the present experiments (up to 6.4D ). These results agree with the measurements of Kvernvold et al (1984) by means of LDA, as well as with the observations of DeJesus et al (1995) and Kawaji et al (1997) who used the photochromic dye activation method. Fig.…”

Section: Velocity Of the Liquid In The ®Lmsupporting

confidence: 91%

“…The axial locations of the onset and termination of the reverse¯ow were close to those measured by Nakoryakov et al (1986Nakoryakov et al ( ,1989. DeJesus et al (1995), Kawaji et al (1997) and Ahmad et al (1998) applied the photochromic dye activation method to measure the¯ow ®eld around a bubble rising in stagnant liquid (kerosene). The instantaneous velocity distributions in front of the bubble, in the liquid ®lm and in the near wake were visualized.…”

Section: International Journal Of Multiphase Flow 25 (1999) 957±975mentioning

confidence: 52%

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The relation between the Taylor bubble motion and the velocity field ahead of it

Polonsky

Shemer

Barnea

1999

International Journal of Multiphase Flow

132

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This paper is dedicated to Professor Gad Hetsroni on the occasion of his 65th birthday. Gad, through his leadership and devotion to science in general and multiphase¯ows in particular, has been the beacon of this ®eld. As the Founder and the Editor of the International Journal of Multiphase Flow, Gad has marched this ®eld forward at a rapid pace and positioned it at the focus of science and engineering. We would like to express our deep gratitude to Gad for all he has done for the ®eld of multiphase¯ow and we wish him many more productive and enjoyable years. AbstractThe motion of a single elongated (Taylor) bubble propagating in a transparent vertical pipe is studied experimentally in stagnant liquid, as well as in upward and downward liquid¯ow. Digital image processing of a sequence of video images serves as the main experimental method for the study of the Taylor bubble motion. In addition, the distribution of the velocities in front of the bubble and in the liquid ®lm is measured using Particle Image Velocimetry. The relation between the Taylor bubble motion and the velocity ®eld in front of it is discussed. #

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Section: Velocity Of the Liquid In The ®Lmsupporting

confidence: 91%

Section: International Journal Of Multiphase Flow 25 (1999) 957±975mentioning

confidence: 52%

The relation between the Taylor bubble motion and the velocity field ahead of it

Polonsky

Shemer

Barnea

1999

International Journal of Multiphase Flow

132

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“…Measurements of flow field parameters around elongated bubbles in pipes are sparse (Kvernvold et al, 1984;Nakoryakov et al, 1986Nakoryakov et al, , 1989Shemer and Barnea, 1987;DeJesus et al, 1995;Kawaji et al, 1997;Ahmad et al, 1998;Polonsky et al, 1999b). Kvernvold et al (1984) performed velocity measurements in horizontal slug flow using Laser Doppler Velocimetry.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the velocity field induced by a Taylor bubble rising in stagnant water

Hout

Gulitski

Barnea

et al. 2002

International Journal of Multiphase Flow

101

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An experimental investigation of the flow field around a single Taylor bubble rising in a vertical pipe filled with stagnant water is presented. The Reynolds number of the flow based on the Taylor bubble rise velocity and the pipe diameter is 4350. The velocity field around the bubble was determined by Particle Image Velocimetry (PIV). The mean velocity fields in front of the bubble, in the liquid film, and in the wake region were calculated by ensemble-averaging the instantaneous velocity fields measured around 100 different bubbles. Ensemble-averaged velocities become negligible at 0.5D from the bubble nose and at $12 D from the bubble tail. However, notable instantaneous velocity fluctuations were found to exist up to 50D from the Taylor bubble tail. These residual vortices may influence the shape and the propagation velocity of the trailing bubble even at large separation distances. Ó

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“…The VOF method belongs to the so called "one" fluid method, where a single set of conservation equations is solved for the whole domain. The VOF method codes have been used extensively to calculate the hydrodynamics of bubbles rising in liquid by Kawaji et al,( 1997). They noted a new result which was not observed experimentally when they compared the numerical simulation results from a two dimensional simulation of a Taylor bubble rising in a stagnant liquid filled tube to experimental analysis.…”

Section: Vof Modelmentioning

confidence: 99%