Experiments on the Turbulent Structure and the Void Fraction Distribution in the Taylor Bubble Wake

Shemer, Lev; Gulitski, A.; Barnea, Dvora

doi:10.1615/multscientechn.v17.i1-2.60

Cited by 16 publications

(9 citation statements)

References 9 publications

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“…In Figures 10a and 11a, the vertical case shows the same trend with the air–water system but has a higher value. The highest value is attained in the vicinity of Taylor bubble bottom for both

U_{rms}^{'}

and

V_{rms}^{'}

, in agreement with van Hout et al and Shemer et al van Hout et al held that the high values of

U_{rms}^{'}

immediately below the bubble bottom reflect the vigorous oscillations of the bubble bottom interface, then

U_{rms}^{'}

decreases from bubble bottom.…”

Section: Resultssupporting

confidence: 88%

“…For the vertical case, a pair of vortexes is captured by the 0th mode. This implies annular jet also exists in the average flow field, which is similar to the single bubble system . At

θ \leq 60^{\circ}

, as mentioned above, the jet is no longer annular but located at the lower part of the bubble and creates a single counterclockwise vortex in the wake.…”

Section: Resultsmentioning

confidence: 71%

“…Shemer et al obtained the large‐scale structures of first 3 POD modes of Taylor bubble wake in water medium. The experiment condition of Shemer is compared with the present study in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…In the slug flow, the propagation velocity of the Taylor bubble moving in the wake of the leading bubble is strongly dependent on the instantaneous rather than the mean velocity field ahead of it . Therefore, Shemer et al applied proper orthogonal decomposition (POD) to provide an unbiased identification of coherent structures in turbulent flow in the near wake region of a Taylor bubble in water medium. POD has been used for reconstructing the low‐dimensional model in a variety of disciplines, looking for maximising flow energy with the first few modes of the decomposition .…”

Section: Introductionmentioning

confidence: 99%

“…The interaction between two consecutive Taylor bubbles was studied by visualisation technique in an earlier age. [5,7,9,[24][25][26] Later, the interaction mechanism was successfully explained on a perspective of velocity distributions in liquid phase Shemer et al [27][28][29] . Shemer and Barnea [9] hypothesised that there is a minimum stable liquid slug length beyond which the Taylor Bubbles would rise at the same velocity and would not coalesce.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Study on the flow structure and its effects on the interaction and formation of cryogenic taylor bubbles by PIV technique and POD analysis

et al. 2013

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The flow structures around continuous cryogenic Taylor bubbles in the concentric glass tube with different diameters were investigated using particle image velocimetry (PIV) technique under various inclination angles. Optical distortions produced by tube curvature and the refractive index differences between tube and fluid were corrected using ray tracing method. Based on the PIV results, the proper orthogonal decomposition (POD) method was used to investigate the effect of flow structure on the interaction of Taylor bubbles through the large‐scale turbulent structures of POD modes. Four best‐fitted curves for Taylor bubble interaction for different inclination angles were represented. A correlation for Taylor bubble formation was developed with the consideration of turbulence suppression, tube inner diameter, fluid properties, inclination angle, etc. The results demonstrate that the minimum stable distance attains the smallest value at θ=60∘. The correlation for Taylor bubble formation shows good agreement with the experimental data both in the present study and from its references.

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“…In Figures 10a and 11a, the vertical case shows the same trend with the air–water system but has a higher value. The highest value is attained in the vicinity of Taylor bubble bottom for both

U_{rms}^{'}

and

V_{rms}^{'}

, in agreement with van Hout et al and Shemer et al van Hout et al held that the high values of

U_{rms}^{'}

immediately below the bubble bottom reflect the vigorous oscillations of the bubble bottom interface, then

U_{rms}^{'}

decreases from bubble bottom.…”

Section: Resultssupporting

confidence: 88%

“…For the vertical case, a pair of vortexes is captured by the 0th mode. This implies annular jet also exists in the average flow field, which is similar to the single bubble system . At

θ \leq 60^{\circ}

, as mentioned above, the jet is no longer annular but located at the lower part of the bubble and creates a single counterclockwise vortex in the wake.…”

Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Study on the flow structure and its effects on the interaction and formation of cryogenic taylor bubbles by PIV technique and POD analysis

et al. 2013

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Experimental study on near wall transport characteristics of slug flow in a vertical pipe

2012

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In this work, the wall shear stress and the mass transfer coefficient of the gas-liquid two-phase upward slug flow in a vertical pipe are investigated experimentally, using limiting diffusion current probes and digital highspeed video system. In experiments, the instantaneous and averaged characteristics of wall shear stress and mass transfer coefficient are concerned. The experimental results are compared with the numerical results in previous paper of the authors. Both experiment and numerical simulation show that the superficial gas and liquid velocities have an obvious influence on the instantaneous characteristics of the two profiles. The mass transfer coefficient has characteristics similar to the wall shear stress. The instantaneous wall shear stress and mass transfer coefficient profiles have the periodicity of slug flow. The averaged wall shear stress and mass transfer coefficient increase with increased superficial gas velocity. However, there is inconsistency in the variation trends of the averaged wall shear stress and mass transfer coefficient with superficial liquid velocity between experimental result and numerical simulation result, which can be attributed to the difference in flow condition. Moreover, the Taylor bubble length is also another impacting factor. The experimental and numerical results all shows that the product scale can not be damaged directly by the flow movement of slug flow. In fact, the alternative forces and fluctuations with high frequency acting on the pipe wall due to slug flow is the main cause for the slug flow enhanced CO 2 corrosion process.

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Numerical simulations of the dynamics of Taylor bubble in the presence of small-dispersed bubbles

Gawusu

Zhang

2021

Heat Mass Transfer

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Experiments on the Turbulent Structure and the Void Fraction Distribution in the Taylor Bubble Wake

Cited by 16 publications

References 9 publications

Study on the flow structure and its effects on the interaction and formation of cryogenic taylor bubbles by PIV technique and POD analysis

Study on the flow structure and its effects on the interaction and formation of cryogenic taylor bubbles by PIV technique and POD analysis

Experimental study on near wall transport characteristics of slug flow in a vertical pipe

Numerical simulations of the dynamics of Taylor bubble in the presence of small-dispersed bubbles

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