Coalescence of two initially spherical bubbles: Dual effect of liquid viscosity

Zhang, Yang; Chen, Ke; You, Yancheng; Ren, Wei

doi:10.1016/j.ijheatfluidflow.2018.05.009

Cited by 21 publications

(11 citation statements)

References 57 publications

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“…The shape of the curves presented in Fig. 3 is in good agreement with experimental data and conclusions from [14][15][16][17][18]. With higher surface tension and lower viscosity of the liquid composition, more kinetic energy of the droplets is required for their significant transformation and breakup.…”

Section: Impact Of Droplet Component Compositionsupporting

confidence: 85%

“…The liquid compositions to be studied were chosen from those widely used in thermal water treatment, heat carriers based on flue gases, water vapor and droplets, secondary atomization of homogeneous and highly inhomogeneous liquids, etc. It was also important to compare the experimental results with the data in [14][15][16][17][18] in certain variation ranges of the Weber numbers and interaction parameters. We used the following compositions: tap water; saline solutions (mass fraction of NaCl up to 5 wt%); oil-in-water emulsions (volume concentration of oil up to 10 vol%); compositions based on foaming agents (typically used in firefighting for the atomization of water batches discharged); graphite-water slurries (solid particle concentration up to 5 wt%); slurries based on bentonite (key additive inhibiting the growth of spray zone size in firefighting).…”

Section: Methodsmentioning

confidence: 99%

“…For instance, values for these parameters are provided in [5,6]. From the analysis of studies [14,15], we can conclude that the scientific community has been focusing on recording the duration (typical times) of droplet coalescence. No experimental data or calculations based on modeling of collision times for droplet bounce, separation, or disruption have been published so far.…”

Section: Introductionmentioning

confidence: 99%

“…No experimental data or calculations based on modeling of collision times for droplet bounce, separation, or disruption have been published so far. According to studies [14][15][16][17][18], these times are short and cannot differ significantly in such collision behaviors. Experimental data on the quantity and size of liquid fragments formed due to collisions is also scarce.…”

Section: Introductionmentioning

confidence: 99%

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Interaction times of homogeneous and heterogeneous droplets in gases

et al. 2021

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In this research, we present the results of experiments measuring the interaction times of colliding liquid droplets in different modes (bounce, coalescence, separation, and disruption). The experiments involve water and typical water-based slurries, emulsions, and solutions. The main experimental parameters are close to those of high-potential gas-vapor-droplet technologies (heat and mass transfer power plants, thermal and flame water treatment systems, and fuel technologies): droplet size 0.1-5 mm; velocities 0.1-10 m/s; liquid temperature 20-80 ?C; impact angle 0-90?; relative volume and mass fractions of liquid and solid additives in water 0-10%. We explore how a set of parameters and effects influence the characteristics of the processes under study. The most important of these parameters are relative droplet velocity, impact angle, impact parameter, and temperature. Using dimensionless linear and angular interaction parameters as well as the Weber, Reynolds and Ohnesorge numbers, we produce interaction mode maps to consider the correlation of the main forces: inertia, surface tension, and viscosity. We determine the interaction times, number, size, and total surface area of the newly formed post-collision droplets and obtain approximations for the experimentally determined functions.

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Section: Impact Of Droplet Component Compositionsupporting

confidence: 85%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Interaction times of homogeneous and heterogeneous droplets in gases

et al. 2021

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“…The experimental research into the collisions of gas bubbles is fraught with the difficulty of obtaining accurate data, as described above, due to light refraction at the gas-liquid interface. Zhang et al [21] used modeling to study the coalescence of two identical sphere-shaped gas bubbles. Four coalescence regimes conditioned by the movement of liquid around bubbles were identified.…”

Section: Introductionmentioning

confidence: 99%

Collisions of Two-Phase Liquid Droplets in a Heated Gas Medium

Tkachenko

Shlegel

Стрижак

2021

Entropy

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The paper presents the experimental research findings for the integral characteristics of processes developing when two-phase liquid droplets collide in a heated gas medium. The experiments were conducted in a closed heat exchange chamber space filled with air. The gas medium was heated to 400–500 °C by an induction system. In the experiments, the size of initial droplets, their velocities and impact angles were varied in the ranges typical of industrial applications. The main varied parameter was the percentage of vapor (volume of bubbles) in the droplet (up to 90% of the liquid volume). The droplet collision regimes (coalescence, bounce, breakup, disruption), size and number of secondary fragments, as well as the relative volume fraction of vapor bubbles in them were recorded. Differences in the collision regimes and in the distribution of secondary fragments by size were identified. The areas of liquid surface before and after the initial droplet breakup were determined. Conditions were outlined in which vapor bubbles had a significant and, on the contrary, fairly weak effect on the interaction regimes of two-phase droplets.

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Motion and interaction of in‐line bubbles in quiescent non‐aqueous solutions of hydrocarbon resin

Mei,

Luo,

Zhang

et al. 2024

Asia-Pacific J Chem Eng

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Hydrocarbon resin (HR) is an essential fine chemical. The preparation and application process of HR involves lots of gas–liquid heterogeneous reactions, and the bubbly flow behavior influences them significantly. Using high‐speed photography and digital image processing techniques, the motion and interaction of in‐line bubbles in non‐aqueous solutions of HR are examined in this article. The results show a critical gas flow rate that can change the bubbling regime. It can be observed that viscosity features prominently in changing the shape of bubbles and their motion. As the viscosity increases, the bubbles are more prone to coalescence, and the bubble coalescence process gradually changes from connected slip‐rising coalescence to connected‐rising coalescence. The viscosity transition region between non‐coalescent and coalescent systems in non‐aqueous solutions of HR occurs at 3.6–9.2 mPa·s. Further, a force analysis shows that in paired bubbles, the leading bubble can be viewed as an individual bubble unaffected by trailing bubble before the two bubbles collide, but in the wake of the leading bubble, the drag force on the trailing bubble decreases and the added mass force increases.

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Coalescence of two initially spherical bubbles: Dual effect of liquid viscosity

Cited by 21 publications

References 57 publications

Interaction times of homogeneous and heterogeneous droplets in gases

Interaction times of homogeneous and heterogeneous droplets in gases

Collisions of Two-Phase Liquid Droplets in a Heated Gas Medium

Motion and interaction of in‐line bubbles in quiescent non‐aqueous solutions of hydrocarbon resin

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