Vibrating liquids in space

Mazzoni, Stefano; Shevtsova, Valentina; Mialdun, Aliaksndr; Melnikov, Denis; Gaponenko, Yuri; Lyubimova, Tatyana; Saghir, M.Z.

doi:10.1051/epn/2010601

Cited by 37 publications

(22 citation statements)

References 5 publications

(12 reference statements)

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“…To gain better physical insight into the dynamics of mean flows, an extensive experimental and numerical study of thermo-soluto-vibrational convection under microgravity conditions is conducted. The preparation of this experiment was Vibrational reported previously by Shevtsova et al (2007);Melnikov, Shevtsova & Legros (2008) and Shevtsova (2010c), whereas the first experimental results were concisely presented by Mazzoni et al (2010) and Shevtsova et al (2011a,b). This paper is organised as follows.…”

Section: Shevtsova and Othersmentioning

confidence: 89%

Dynamics of a binary mixture subjected to a temperature gradient and oscillatory forcing

et al. 2015

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We examine the dynamics of a binary mixture in a cubic cell subjected to a temperature differential and oscillatory forcing. The Soret effect, which is negative in the present study, provides a coupling mechanism by which a temperature gradient establishes a concentration gradient in a mixture. We present the results of experiments that were performed on the International Space Station (ISS) and compare the observations with the results of direct numerical simulations. The evolution of temperature and concentration fields is investigated by optical digital interferometry. One advantage of the experimental technique is the observation of the fields along two perpendicular directions of the cell, allowing us to restore the three-dimensional field. Experimental evidence disproves speculations that the ISS microgravity environment always affects diffusion-controlled processes. Furthermore, we demonstrate that imposed vibrations with constant frequency and amplitude create slow mean flows and that they do influence the diffusion kinetics. The perturbation of the diffusive fields scales as the square of the vibrational velocity. In addition to calculations of the full three-dimensional Navier-Stokes equations, a two-time-scale computational methodology is used for situations in which the forcing period is very small compared to the natural time scales of the problem. The simulations show excellent agreement with experimental observations.

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Section: Shevtsova and Othersmentioning

confidence: 89%

Dynamics of a binary mixture subjected to a temperature gradient and oscillatory forcing

et al. 2015

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“…The fluids used were 90 % (mass) of water in isopropanol and 50 % (mass) of water in isopropanol. The concentrations of the liquids were chosen for their well-known properties due to the experience of handling them (Mazzoni et al 2010;Shevtsova et al 2011). The parameters of the mixtures are presented in table 1.…”

Section: The Experimentsmentioning

confidence: 99%

Dynamics of the interface between miscible liquids subjected to horizontal vibration

et al. 2015

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We present experimental evidence of the existence of an interfacial instability between two miscible liquids of similar (but non-identical) viscosities and densities under horizontal vibration. A stably stratified two-layer system is composed of the same binary mixture with different concentrations placed in a confined cell (with length twice as large as the height). Unlike the case of immiscible fluids, here, the interface is a transient layer of small but non-zero thickness. In the experiments, the frequency and amplitude were varied within the ranges 2-24 Hz and 1.5-16 mm, respectively. When the value of the oscillatory forcing increases, the amplitudes of the interface perturbations grow continuously, forming a saw-tooth frozen structure. This evolution is also examined numerically. In addition to the solutions of full 3-D Navier-Stokes equations, an averaging approach with separation of time scales is used for situations in which the forcing period is very small compared to the natural time scales of the problem. The simulation of averaged equations provides the explanation of the instability development, the calculations of the full nonlinear equations shed light on the decay of a wavy pattern. The results of numerical modelling perfectly support the experimental observations.

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“…The application of vibration to a fluid system with density gradient has received extensive attention . A subject of importance is to evaluate the effects of inevitable vibrations on heat and mass transfer on the microgravity platforms such as space station and satellites . By recreating some characteristics of the earth's gravity, vibration leads to mean flows similar to gravity‐induced convection and, thus, may serve as a way to control and operate fluids on the microgravity platforms .…”

Section: Introductionmentioning

confidence: 99%

“…[3] A subject of importance is to evaluate the effects of inevitable vibrations on heat and mass transfer on the microgravity platforms such as space station and satellites. [4] By recreating some characteristics of the earth's gravity, vibration leads to mean flows similar to gravity-induced convection and, thus, may serve as a way to control and operate fluids on the microgravity platforms. [5] Recent experiments provide evidence that interfacial instability exists between two liquids in a closed container subject to horizontal vibration and brings significant changes in the heat and mass transfer properties of the fluid system.…”

Section: Introductionmentioning

confidence: 99%

Characterization of fluid mixing in a closed container under horizontal vibrations

Zhan

Sun

et al. 2019

Can J Chem Eng

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The mixing characteristics of two initially stratified miscible fluids in a closed container vibrated horizontally are studied numerically by a validated computational fluid dynamics model. The flow characteristics and interfacial dynamics in the closed vibrating container are analyzed, and the effects of vibration parameters and gravity on mixing efficiency are evaluated both quantitatively and qualitatively. The results show that interfacial instability occurs in the closed container, which leads to interfacial deformation and breakup and quickens mixing. Two distinct stages of the mixing process can be observed in the closed vibrating container. During the macro‐mixing, an increasingly sharp gradient of the concentration field is generated. During the micro‐mixing, the mixing process is dominated by the diffusion of the concentration field and ends up with a nearly homogeneous mixture. The intensification of mixing process by vibration is most pronounced in the absence of static gravity. The gravity can suppress the interfacial instability and retard the mixing process. Over the range of conditions investigated in this paper, vibration is an efficient approach for mixing miscible liquids in a closed container.

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Vibrating liquids in space

Cited by 37 publications

References 5 publications

Dynamics of a binary mixture subjected to a temperature gradient and oscillatory forcing

Dynamics of a binary mixture subjected to a temperature gradient and oscillatory forcing

Dynamics of the interface between miscible liquids subjected to horizontal vibration

Characterization of fluid mixing in a closed container under horizontal vibrations

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