Dynamics of drops — Formation, growth, oscillation, detachment, and coalescence

Karbaschi, Mohsen; Rahni, Mohammad Taeibi; Javadi, Aliyar; Cronan, C. L.; Schano, K. H.; Faraji, Samee; Won, Jooyoung; Ferri, James K.; Krägel, J.; Miller, R.

doi:10.1016/j.cis.2014.10.009

Cited by 15 publications

(11 citation statements)

References 83 publications

(118 reference statements)

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“…They studied the influence of mechanical stress on coalescence by varying the oscillation frequency. A similar set-up was presented by Loglio et al (2011), which was later used by Karbaschi et al (2014) to examine the liquid bridge formation qualitatively. Scheele and Leng (1971) were the first to study the horizontal, dynamic binary collision of moving anisole droplets with varying approach velocities and angles in a stagnant water phase.…”

Section: Dynamic Conditionsmentioning

confidence: 99%

Drop coalescence in technical liquid/liquid applications: a review on experimental techniques and modeling approaches

Kamp

Villwock

Kraume

2016

Reviews in Chemical Engineering

118

106

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AbstractThe coalescence phenomenon of drops in liquid/liquid systems is reviewed with particular focus on its technical relevance and application. Due to the complexity of coalescence, a comprehensive survey of the coalescence process and the numerous influencing factors is given. Subsequently, available experimental techniques with different levels of detail are summarized and compared. These techniques can be divided in simple settling tests for qualitative coalescence behavior investigations and gravity settler design, single-drop coalescence studies at flat interfaces as well as between droplets, and detailed film drainage analysis. To model the coalescence rate in liquid/liquid systems on a technical scale, the generic population balance framework is introduced. Additionally, different coalescence modeling approaches are reviewed with ascending level of detail from empirical correlations to comprehensive film drainage models and detailed computational fluid and particle dynamics.

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Section: Dynamic Conditionsmentioning

confidence: 99%

Drop coalescence in technical liquid/liquid applications: a review on experimental techniques and modeling approaches

Kamp

Villwock

Kraume

2016

Reviews in Chemical Engineering

118

106

View full text Add to dashboard Cite

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“…The collision and coalescence of two bubbles or droplets and the formation of a dimple, bridge and film rupture can be evaluated with external high‐speed cameras . Therefore, both droplets can be attached to cannulas and brought in contact which allows for a detailed analysis of the film drainage and development of the liquid bridge during coalescence , . The collision of a rising or falling particle with a particle fixed by a cannula has the advantage that the relative collision velocity as well as the effect of impact location can be analyzed and used to achieve information on the coalescence efficiency (Fig.…”

Section: Single Particle Characterizationmentioning

confidence: 99%

“…The complex dynamics are not yet fully understood despite extensive experimental and numerical effort in this field of study. One example provided by Karbaschi et al is the surface tension measurement at water/air interfaces at different Reynolds numbers induced by different volume flows and droplet growth rates, respectively. The interfacial tension of these systems is severely underestimated if the standard method of fitting the profile to the Gauss‐Laplace equation is used.…”

Section: Interface Characterizationmentioning

confidence: 99%

“…The interfacial tension of these systems is severely underestimated if the standard method of fitting the profile to the Gauss‐Laplace equation is used. For fast growing droplets, the capillary pressure tensiometry is an alternative that can also be applied under instable conditions and in presence of Marangoni convection . The dynamic processes are of particular importance in fluid particle swarms where mass transfer, coalescence and breakage events occur.…”

Section: Interface Characterizationmentioning

confidence: 99%

“…This work focusses on optical techniques that currently are promoted by progress in material science and manufacturing technology, leading for example to smaller and higher resolving lens systems and more possibilities concerning optical accessibility. There are already numerous reviews on the details of measurement techniques in general and on specific techniques available. Therefore, this work seeks to provide an overview on measurement techniques and literature closely related to the problems arising in disperse multiphase systems on different size scales.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Description of Disperse Multiphase Processes: Quo Vadis?

Hohl

Panckow

Schulz

et al. 2018

Chemie Ingenieur Technik

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The experimental accessibility of disperse systems often is a critical factor when it comes to the development of modeling approaches that intend to converge towards an exact solution. Often, integral or pseudo‐homogeneous values are used to reduce the complexity of the system, but a detailed single particle or interface analysis is crucial to understand relevant effects that also affect the swarm behavior. A high number of experimental techniques with respective limitations and advantages is available to quantify these effects. In this work, an overview on measurement techniques for momentum, heat and mass transfer in particle swarms as well as for the particle size distribution and interface characterization is provided. The industrial applicability is addressed by pointing out the vicinity to the process and the costs of different measurement techniques.

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A novel microfluidic method to simultaneously measure droplet size and interfacial tension without visualization

Xuan

Lan

et al. 2023

AIChE Journal

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Droplet size and interfacial tension are key parameters related to two‐phase flow. However, current methods for measuring these parameters are usually based on visualization and are therefore not applicable for invisible two‐phase flow systems. Moreover, real‐time determination of interfacial tension is difficult because conventional methods cannot be employed in the flow field. This study presents a novel method for simultaneously measuring the droplet size and real‐time interfacial tension in a two‐phase flow system. A T‐shaped microdevice was designed and integrated with the two‐phase flow equipment. The pressure variation as the droplets flowed through the microdevice was used as a probe to detect the two key parameters, that is, visualization is not required. Monodispersed and multidispersed droplet flows in different equipment were used to verify the method. Both the droplet size distribution and real‐time interfacial tension can be determined using the developed approach.

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Dynamics of drops — Formation, growth, oscillation, detachment, and coalescence

Cited by 15 publications

References 83 publications

Drop coalescence in technical liquid/liquid applications: a review on experimental techniques and modeling approaches

Drop coalescence in technical liquid/liquid applications: a review on experimental techniques and modeling approaches

Description of Disperse Multiphase Processes: Quo Vadis?

A novel microfluidic method to simultaneously measure droplet size and interfacial tension without visualization

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