Effect of Marangoni induced instabilities on a melting bridge under microgravity conditions

Šeta, Berin; Dubert, Diana; Gavaldà, Jna.; Bou-Ali, M. Mounir; Ruíz, Xavier

doi:10.1016/j.ijheatmasstransfer.2021.121665

Cited by 13 publications

(4 citation statements)

References 48 publications

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“…As an alternative strategy, the use of the thermocapillary effect -in which a non-uniform temperature induces surface tension gradients that drive convective motion -has been proposed as a source of convective heat transport in microgravity PCM devices (Madruga & Mendoza 2017a,b). A possible improvement in heat transfer due to thermocapillary (Marangoni) convection was verified in parabolic flight experiments (Ezquerro et al 2019(Ezquerro et al , 2020Salgado Sánchez et al 2020b) and confirmed by numerical simulations (Salgado Sánchez et al 2020aŠeta et al 2021a,b, 2022.…”

Section: Introductionmentioning

confidence: 64%

“…Recent studies of melting bridges (Šeta et al. 2021 a , b , 2022) have shown that their nonlinear flow dynamics is more complex than in liquid bridges without melting. The evolution of the melting bridge dominant frequency over time at different Biot numbers is shown in figure 9 at K. The frequency analysis starts from the moment of emergence of oscillations and continues until the completion of the entire melting process where the system reaches steady-state oscillations.…”

Section: Results: Oscillatory Flowmentioning

confidence: 99%

“…The validation with the existing experiments in the literature has been done in our previous works (Šeta et al. 2021 a , b , 2022). In all the cases, mesh 2 (blue curves) is found to offer a good compromise between a reduced computational cost and numerical accuracy.…”

Section: Mathematical Modelmentioning

confidence: 87%

“…The flow regimes in the melting bridge analysed by Šeta et al. (2021 a , b ) revealed the appearance of hydrothermal waves (HTWs) in a liquid volume of more than 80 %, except for a narrow region of thermal stresses , where this occurs in a liquid fraction of about 65 %. The standing waves (SWs) are the first to appear (Šeta et al.…”

Section: Introductionmentioning

confidence: 99%

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Effect of heat transfer through an interface on convective melting dynamics of phase change materials

et al. 2023

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The presence of thermocapillary (Marangoni) convection in microgravity may help to enhance the heat transfer rate of phase change materials (PCMs) in space applications. We present a three-dimensional numerical investigation of the nonlinear dynamics of a melting PCM placed in a cylindrical container filled with n-octadecane and surrounded by passive air. The heat exchange between the PCM and ambient air is characterized in terms of the Biot number, when the air temperature has a linear profile. The effect of thermocapillary convection on heat transfer and the topology of the melting front is studied by varying the applied temperature difference between the circular supports and the heat transfer through the interface. The evolution of Marangoni convection during the PCM melting leads to the appearance of hydrothermal instabilities. A new mathematical approach for the nonlinear analysis of emerging hydrothermal waves (HTWs) is suggested. Being applied for the first time to the examination of PCMs, this procedure allows us to explore the nature of the coupling between HTWs and heat gain/loss through the interface, and how it changes over time. We observe a variety of dynamics, including standing and travelling waves, and determine their dominant and secondary azimuthal wavenumbers. Coexistence of multiple travelling waves with different wavenumbers, rotating in the same or opposite directions, is among the most fascinating observations.

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Section: Introductionmentioning

confidence: 64%

Section: Results: Oscillatory Flowmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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Effect of heat transfer through an interface on convective melting dynamics of phase change materials

et al. 2023

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Effects of Thermocapillary and Natural Convection During the Melting of PCMs with a Liquid Bridge Geometry

Varas

Martínez

Olfe

et al. 2023

Microgravity Sci. Technol.

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The results of a numerical investigation of the melting of a PCM occupying an axisymmetric volume in the presence of gravity are presented. The PCM is held between two circular supports maintained at different temperatures. The melting process, which is analyzed for n-octadecane, is affected by a combination of thermocapillary and natural convection. If the PCM is heated from above, the convective motion driven by the thermocapillary force is opposed by the buoyant force, which reduces the heat transfer rate. If the PCM is heated from below, natural convection acts in the same sense as thermocapillary convection and the heat transfer rate is increased. The volume $$\mathcal {V}$$ V of the PCM relative to an ideal cylinder, which selects the shape of the PCM/air interface, is found to play an important role. The overall effect of natural convection on heat transfer is characterized by the ratio of the melting time in microgravity to that of the same system with gravity. This gain factor is greater (less) than unity when heating from below (above) and depends strongly on $$\mathcal {V}$$ V , particularly for smaller PCM volumes.

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The “Effect of Marangoni Convection on Heat Transfer in Phase Change Materials” experiment

et al. 2023

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Effect of Marangoni induced instabilities on a melting bridge under microgravity conditions

Cited by 13 publications

References 48 publications

Effect of heat transfer through an interface on convective melting dynamics of phase change materials

Effect of heat transfer through an interface on convective melting dynamics of phase change materials

Effects of Thermocapillary and Natural Convection During the Melting of PCMs with a Liquid Bridge Geometry

The “Effect of Marangoni Convection on Heat Transfer in Phase Change Materials” experiment

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