The CFVib Experiment: Control of Fluids in Microgravity with Vibrations

Fernández, J.; Sánchez, P.; Porter, Jeff; Ezquerro, J.M.

doi:10.1007/s12217-017-9556-7

Cited by 35 publications

(9 citation statements)

References 50 publications

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“…All possible fluid configurations must be considered, and multiple local minima may coexist [45]. Already qualitatively consistent with early experiments [19,50,175,176], the predictions of vibroequilibria theory were recently confirmed by quantitative comparison with simulations of the Navier-Stokes equations [45] and with the results of a microgravity experiment specifically dedicated to observing the effect [44,132].…”

Section: Vibroequilibriasupporting

confidence: 60%

“…Since the frozen wave instability depends on the imposition of an oscillatory shear flow, the forcing must have a significant component parallel to the initial interface. Deviations from this ideal configuration will occur, however, particularly in parabolic flight experiments where residual acceleration is not negligible and both its direction and magnitude vary [44].…”

Section: Effect Of the Initial Statementioning

confidence: 99%

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A review of fluid instabilities and control strategies with applications in microgravity

Porter

Sánchez

Shevtsova

et al. 2021

Math. Model. Nat. Phenom.

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We give a brief review of several prominent fluid instabilities representing transitions driven by gravity, surface tension, thermal energy, and applied motion/acceleration. Strategies for controlling these instabilities, including their pattern formation properties, are discussed. The importance of gravity for many common fluid instabilities is emphasized and used to understand the sometimes dramatically different behavior of fluids in microgravity environments. This is illustrated in greater detail, using recent results, for the case of the frozen wave instability, which leads to large columnar structures in the absence of gravity. The development of these highly nonlinear states is often complex, but can be manipulated through an appropriate choice of forcing amplitude, container length and height, initial inclination of the surface, and other parameters affecting the nonlinear and inhomogeneous growth process. The increased opportunity for controlling fluids and their instabilities via small forcing or parameter changes in microgravity is notable.

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Section: Vibroequilibriasupporting

confidence: 60%

Section: Effect Of the Initial Statementioning

confidence: 99%

A review of fluid instabilities and control strategies with applications in microgravity

Porter

Sánchez

Shevtsova

et al. 2021

Math. Model. Nat. Phenom.

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“…Ganiev, Lakiza & Tsapenko 1977). The experiments of Fernandez et al (2017a), which were performed in a parabolic flight campaign, delivered vibrations using piezoelectric devices to liquid-gas and liquid-liquid configurations confined in rectangular and cylindrical containers. This permitted a wide range of frequencies to be investigated, and the corresponding modes and vibroequilibria solutions included both hydrodynamic and acoustic cases.…”

Section: P Salgado Sanchez and Othersmentioning

confidence: 99%

Interfacial phenomena in immiscible liquids subjected to vibrations in microgravity

et al. 2019

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We consider the response to periodic forcing between 5 Hz and 50 Hz of an interface separating immiscible fluids under the microgravity conditions of a parabolic flight. Two pairs of liquids with viscosity ratios differing by one order of magnitude are investigated. By combining experimental data with numerical simulations, we describe a variety of dynamics including harmonic and subharmonic (Faraday) waves, frozen waves and drop ejection, determining their thresholds and scaling properties when possible. Interaction between these various modes is facilitated in microgravity by the relative ease with which the interface can move, altering its orientation with respect to the forcing axis. The effects of key factors controlling pattern selection are analysed, including vibrational forcing, viscosity ratio, finite-size effects and residual gravity. Complex behaviour often arises with features on several spatial scales, such as Faraday waves excited on the interface of a larger columnar structure that develops due to the frozen wave instability – this type of state was previously seen in miscible fluid experiments but is described for the first time here in the immiscible case.

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“…When the excitation has been applied for 5 s, a long wavelength perturbation is clearly visible on the interface. It grows in amplitude, especially near the endwalls, something that is likely promoted by the vibroequilibria effect, wherein the inhomogeneous oscillatory velocity field drives a reorientation of the interface that, for a horizontally vibrated interface, causes the heavier fluid to move up along the sides, leaving a trough in the center [39][40][41]. Harmonic waves (at the forcing frequency) are also excited, though these cannot be seen in the figure due to the averaging over one period.…”

Section: A Frozen Wave Instability In Shallow Containers: Suppression Of Small Wave Numbersmentioning

confidence: 99%

Finite-size effects on pattern selection in immiscible fluids subjected to horizontal vibrations in weightlessness

et al. 2019

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A detailed numerical investigation of frozen wave pattern selection in finite rectangular containers under microgravity conditions is presented. The column growth cycle controlling mode transitions is described and the instability diagram showing selected wave number as function of the vibrational velocity is obtained. In contrast to the continuous monotonic dependence of pattern wave number on forcing predicted by linear inviscid theory in the limit of infinitely long containers, the pattern selection process in finite domains is characterized by solution branches that persist over discrete forcing intervals. We describe how properties of the selected frozen wave pattern, including the finite critical forcing value, depend on container length. In long containers, a transition from nearly symmetric to asymmetric columnar development is found at sufficiently high forcing values, with the loss of (approximate) reflection symmetry evident in the mean flow associated with the transient growth of the pattern. The effect of container height is considered separately, in the limit of both shallow and deep layers. Shallow layers suppress the development of long-wave perturbations leading to higher wave-number patterns whose growth may be associated with an asymmetric series of collisions between developing columns and container boundaries. In thick layers, lower pattern wave numbers are observed and, although the column growth is on average more regular, the final state is often asymmetric. Finally, we compare our results with the dependence on container aspect ratio = L/2H predicted by inviscid theory. For 2, finite-size effects are reasonably weak and the numerically obtained thresholds are similar to but slightly higher than the theoretical values, most likely due to viscous effects. For 2, finite-size effects come to the fore and onset is significantly delayed.

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The CFVib Experiment: Control of Fluids in Microgravity with Vibrations

Cited by 35 publications

References 50 publications

A review of fluid instabilities and control strategies with applications in microgravity

A review of fluid instabilities and control strategies with applications in microgravity

Interfacial phenomena in immiscible liquids subjected to vibrations in microgravity

Finite-size effects on pattern selection in immiscible fluids subjected to horizontal vibrations in weightlessness

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