Light-induced deformation and instability of a liquid interface. II. Dynamics

Wunenburger, Régis; Casner, A.; Delville, Jean‐Pierre

doi:10.1103/physreve.73.036315

Cited by 22 publications

(29 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Very similar shapes have already been observed when focusing a laser beam on the interface between two immiscible liquids [17,24]. Like in the optical case, jets are observed beyond a power threshold in the configuration where the deformation grows in the direction of acoustic propagation, and tethers are observed in the configuration where the deformation grows in the opposite direction.…”

Section: -P5supporting

confidence: 73%

Deformation of acoustically transparent fluid interfaces by the acoustic radiation pressure

et al. 2008

View full text Add to dashboard Cite

We experimentally study the deformations of liquid-liquid interfaces induced by a high-intensity focused ultrasonic beam. We quantitatively verify that small-amplitude deformations of a transparent chloroform-water interface are well described by the theory of Langevin acoustic radiation pressure, in both static and dynamic regimes. The large-amplitude deformations depend on the direction of propagation of the beam and are qualitatively similar to those induced by electromagnetic radiation pressure.

show abstract

Section: -P5supporting

confidence: 73%

Deformation of acoustically transparent fluid interfaces by the acoustic radiation pressure

et al. 2008

View full text Add to dashboard Cite

show abstract

“…However, farther from onset, the rate of deformation strongly increases versus the beam power. This beam power dependence is clearly at variance with the temporal behaviour of linear deformations, for which the relaxation time scale does not vary with excitation [18]. …”

Section: Liquid Jet Dynamicsmentioning

confidence: 80%

Opto-hydrodynamic instability of fluid interfaces

et al. 2005

Self Cite

View full text Add to dashboard Cite

The bending of fluid interfaces by the optical radiation pressure is now recognized as an appealing contactless tool to probe microscopic surface properties of soft materials. However, as the radiation pressure is intrinsically weak (typically of the order of a few Pascal), investigations are often limited to the regime of weak deformations. Non-linear behaviors can nevertheless be investigated using very soft fluid interfaces. Either a large stable tether is formed, or else a break-up of the interface occurs above a well-defined beam power threshold, depending on the direction of the beam propagation. This asymmetry originates from the occurrence of total reflection condition of light at deformed interface. Interface instability results in the formation of a stationary beam-centered liquid micro-jet that emits droplets. Radiation-induced jetting can also lead to giant tunable liquid columns with aspect ratio up to 100, i.e. well beyond the fundamental Rayleigh-Plateau limitation. Consequently, the applications range of the opto-hydrodynamic interface instability is wide, going from adaptative micro-optics (lensing and light guiding by the induced columns) to micro-fluidics and microspraying, as fluid transfer is optically monitored and directed in three dimensions.

show abstract

“…Though large-aspect-ratio liquid columns are known to be unstable due to the Rayleigh-Plateau instability (3), it is briefly shown in SI Text that this fundamental limitation can be circumvented using the radiation pressure of a continuous laser beam to deform the meniscus separating the coexisting phases (18), which is located in the middle of the sample due to near criticality. For a sufficient beam power, the surface deformation ends up connected to the bottom glass face of the cell, thus forming a large-aspect-ratio liquid column whose diameter is controlled by the incident beam power.…”

Section: Resultsmentioning

confidence: 99%

Break-up dynamics of fluctuating liquid threads

Petit

Rivière

Kellay

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

View full text Add to dashboard Cite

The thinning dynamics of a liquid neck before break-up, as may happen when a drop detaches from a faucet or a capillary, follows different rules and dynamic scaling laws depending on the importance of inertia, viscous stresses, or capillary forces. If now the thinning neck reaches dimensions comparable to the thermally excited interfacial fluctuations, as for nanojet break-up or the fragmentation of thermally annealed nanowires, these fluctuations should play a dominant role according to recent theory and observations. Using near-critical interfaces, we here fully characterize the universal dynamics of this thermal fluctuation-dominated regime and demonstrate that the cross-over from the classical two-fluid pinch-off scenario of a liquid thread to the fluctuation-dominated regime occurs at a well-defined neck radius proportional to the thermal length scale. Investigating satellite drop formation, we also show that at the level of the cross-over between these two regimes it is more probable to produce monodisperse droplets because fluctuation-dominated pinch-off may allow the unique situation where satellite drop formation can be inhibited. Nonetheless, the interplay between the evolution of the neck profiles from the classical to the fluctuation-dominated regime and the satellites' production remains to be clarified.critical fluids | singularity formation F or a drop to detach from a capillary or a faucet, the liquid thread connecting them must thin and break. This break-up, or pinch-off, is an example of a singularity with well-established scaling laws and similarity solutions (1-5). Different regimes and scaling laws have been predicted and observed. For small liquid viscosities, the balance between inertia and capillarity leads to the so-called inertial thinning regime, with the thread radius vanishing as time to pinch-off to the power 2/3. When the radius of the thinning thread becomes smaller than the so-called viscous length scale L η ∼ η in 2 =γρ in (where γ, η in , and ρ in are respectively the surface tension, the shear viscosity, and the density of the fluid), viscous forces become important and the neck radius decreases linearly vs. time (1) as RðtÞ = CV η ðt* − tÞ, where V η ∼ γ=η in is a capillary velocity, C is a constant, and t* is the break-up time at neck pinch-off; a viscous time scale can be defined as τ η ∼ L η =V η . Two thinning regimes have been predicted and observed in this case: the so-called viscocapillary regime at low Reynolds numbers exhibiting symmetric necks with C = 0:071 (6) and the viscocapillary-inertial regime emerging when further thinning significantly increases the inner fluid velocity and thus inertia (7). In this latter case, the constant is C = 0:030 and the neck profiles are asymmetric. Note that more recently, other symmetric break-up dynamics have been found for a class of non-Newtonian fluids for which thinning is dictated by the rheological properties of the fluids (8, 9).When the viscosity of the outer fluid is no more negligible, as in the present investigation, ...

show abstract

Light-induced deformation and instability of a liquid interface. II. Dynamics

Cited by 22 publications

References 31 publications

Deformation of acoustically transparent fluid interfaces by the acoustic radiation pressure

Deformation of acoustically transparent fluid interfaces by the acoustic radiation pressure

Opto-hydrodynamic instability of fluid interfaces

Break-up dynamics of fluctuating liquid threads

Contact Info

Product

Resources

About