Collision between immiscible drops with large surface tension difference: diesel oil and water

Chen, Rong-Horng; Chen, Chiu-Ting

doi:10.1007/s00348-006-0173-2

Cited by 70 publications

(62 citation statements)

References 7 publications

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“…Drop sizes and velocities were determined by image processing. The reason for our experimental finding may be, on the one hand, that our drops are much smaller than the ones realized by Chen & Chen (2006), and, on the other hand, their higher relative velocities. Actually, there is a factor of four in the typical diameters of the drops, and a factor of two in the minimum relative velocities of their study and ours.…”

Section: Main Regimes Observedmentioning

confidence: 47%

“…This, however, has been observed for immiscible liquids under different experimental conditions elsewhere (Chen & Chen 2006). The colliding drops studied…”

Section: Main Regimes Observedmentioning

confidence: 91%

“…The so-called 'crossing separation' (Planchette et al 2010) produces a single encapsulated drop plus a smaller pure oil drop ejected from the side opposite to the side of the original drop arrival. 'Single-reflex separation' (Chen & Chen 2006;Planchette et al 2010) occurs when the aqueous drop is split, resulting in two encapsulated drops. The relative distribution of the two liquids is unknown in this case.…”

Section: Main Regimes Observedmentioning

confidence: 99%

“…By this term they indicated that only the water drop is reflected from the plane of impact, while the diesel oil drop flows around the surface of the water drop and is, therefore, not reflected. In their work, Chen & Chen (2006) did not attempt to propose any model for the collision outcomes. In our work Planchette et al (2010) we found an additional mechanism of immiscible liquid drop collisions which we termed 'crossing separation'.…”

Section: Introductionmentioning

confidence: 97%

“…Technical interest in spray combustion and spray drying motivated investigations on the stability behaviour of colliding drops and the outcome from however, Chen & Chen (2006) found a mechanism which they termed 'single-reflex' separation. By this term they indicated that only the water drop is reflected from the plane of impact, while the diesel oil drop flows around the surface of the water drop and is, therefore, not reflected.…”

Section: Introductionmentioning

confidence: 98%

See 4 more Smart Citations

The onset of fragmentation in binary liquid drop collisions

Planchette¹,

Lorenceau²,

Brenn

2012

J. Fluid Mech.

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International audienceBinary collisions of drops of immiscible liquids are investigated experimentally at well-defined conditions of impact. In the experiments we vary all relevant properties of an aqueous and an oil phase, the impact parameter, the drop size and the relative velocity. The drops observed after the collisions exhibit three main phenomena: full encapsulation, head-on fragmentation, and off-centre fragmentation. The regimes characterized by these phenomena replace the ones observed in binary collisions of drops of the same liquid: coalescence, reflexive separation, and stretching separation. Our aim is a universal description of the two fragmentation thresholds of such collisions. Based on the capillary instability and an energy balance, we establish for head-on collisions a scaling law for the evolution of the threshold impact velocity with the properties of the liquids and the droplet size. The fragmentation threshold for off-centre collisions is compared to established models from the literature, which appear unsatisfactory. Introducing an effective impact parameter, which accounts empirically for the deformation and rotation of the drops upon impact, we describe this fragmentation threshold in a universal way. For both fragmentation thresholds, the agreement between experimental data and their theoretical representation is very good. Our work yields new insight into binary collisions of drops and proposes a perspective to develop a more general description with implications for binary collisions of drops of a single liquid as well

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Section: Main Regimes Observedmentioning

confidence: 47%

“…This, however, has been observed for immiscible liquids under different experimental conditions elsewhere (Chen & Chen 2006). The colliding drops studied…”

Section: Main Regimes Observedmentioning

confidence: 91%

Section: Main Regimes Observedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

The onset of fragmentation in binary liquid drop collisions

Planchette¹,

Lorenceau²,

Brenn

2012

J. Fluid Mech.

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Incompressible multiphase flow and encapsulation simulations using the moment‐of‐fluid method

Lian

Guo

et al. 2015

Numerical Methods in Fluids

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A moment of fluid method is presented for computing solutions to incompressible multiphase flows in which the number of materials can be greater than two. In this work, the multimaterial moment-of-fluid interface representation technique is applied to simulating surface tension effects at points where three materials meet. The advection terms are solved using a directionally split cell integrated semi-Lagrangian algorithm and the projection method is used to evaluate the pressure gradient force term. The underlying computational grid is a dynamic block structured adaptive grid. The new method is applied to multiphase problems illustrating contact line dynamics, triple junctions, and encapsulation in order to demonstrate its capabilities. Examples are given in 2D, 3D axisymmetric (R-Z), and 3D (X-Y-Z) coordinate systems.

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Droplet Collision

Brenn

2010

Handbook of Atomization and Sprays

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Collision between immiscible drops with large surface tension difference: diesel oil and water

Cited by 70 publications

References 7 publications

The onset of fragmentation in binary liquid drop collisions

The onset of fragmentation in binary liquid drop collisions

Incompressible multiphase flow and encapsulation simulations using the moment‐of‐fluid method

Droplet Collision

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