Diffusion measurements using the shear cell technique: Investigation of the role of Marangoni convection by pre-flight experiments on the ground and during the Foton M2 mission

Roşu-Pflumm, Raluca; Wendl, W.; Müller‐Vogt, G.; Suzuki, Shinsuke; Kraatz, Kurt Helmut; Frohberg, G.

doi:10.1016/j.ijheatmasstransfer.2009.06.001

Cited by 16 publications

(17 citation statements)

References 14 publications

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“…Long capillaries are used in order to suppress convective contributions to mass transport. Nevertheless, measured diffusion data scatter by 10% to several 100% [10][11][12][13]. In addition to effects due to melting and solidification, buoyancy-driven convection and Marangoni convection, which is provoked by differences in surface tension, are the main sources of error [8,14,15].…”

Section: Introductionmentioning

confidence: 99%

Influence of cross correlations on interdiffusion in Al-rich Al-Ni melts

2016

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The relation of self-and interdiffusion in a liquid metal, particularly the influence of cross correlations at low concentrations, is studied experimentally. Accurate interdiffusion data are obtained by a combination of x-ray radiography with the shear-cell method on the ground and on the sounding rocket MAPHEUS under microgravity conditions. Self-diffusion coefficients, measured by quasielastic neutron scattering, increase with decreasing Ni concentration, whereas interdiffusion coefficients are about constant. We show that cross correlations influence interdiffusion even at concentrations as low as 2 at. % Ni. Consequently, Darken's equation is not valid in this case.

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Section: Introductionmentioning

confidence: 99%

Influence of cross correlations on interdiffusion in Al-rich Al-Ni melts

2016

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“…Different free surface extents, x M , from 0.025L to 0.2L as shown in Fig. 1, are considered trying to cover as much as possible real experimental scenarios [5,8]. The numerical resolution of the nondimensional transport equations together with a preselected value of D and the corresponding set of boundary conditions were performed using our own finite-volume code [20].…”

Section: Numerical Considerationsmentioning

confidence: 99%

“…Besides the above-mentioned masking effects, a couple of time dependent phenomena have to be considered [8]. The first one is a consequence of the feeding process done in normal atmosphere.…”

Section: Introductionmentioning

confidence: 99%

“…The bubble randomly grows practically at the same position where it appeared but, in this case, a possible oxidation of the free surface could gradually reduce its extent changing the corresponding convective behavior. So, based on the previous comments, it is clear that the experimental works about this topic are, even under microgravity conditions, very scarce and, so, the problem is far to be solved [5,8].…”

Section: Introductionmentioning

confidence: 99%

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On the impact of free surfaces on the measurement of diffusion coefficients in metallic binary alloys using shear cells

Ruíz

Sáez

Gavaldà

et al. 2015

International Journal of Heat and Mass Transfer

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“…The LC method, although simple and easy to implement, has large measured uncertainties, with relative errors of ∼50-100% caused by the effects of additional heating before isothermal diffusion and cooling and solidification effects after isothermal diffusion. 8,9 To avoid the problems of the LC, the SC technique is used, where the isothermal diffusion begins by shearing two liquid columns together and ends by dividing the diffusing liquid column into a number of slices. 2,10 Compared with the LC method, the SC method is much more accurate, but it is much more difficult to set up and carry out, since a large number of precise shearing slices are required.…”

Section: Introductionmentioning

confidence: 99%

A sliding cell technique for diffusion measurements in liquid metals

Geng¹,

Zhu²,

Zhang³

2014

AIP Advances

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The long capillary and shear cell techniques are the usual methods for diffusion measurements in liquid metals. Here we present a new “sliding cell technique” to measure interdiffusion in liquid alloys, which combines the merits of these two methods. Instead of a number of shear cells, as used in the shear cell method, only one sliding cell is designed to separate and join the liquid diffusion samples. Using the sliding cell technique, the influence of the heating process (which affects liquid diffusion measurements in the conventional long capillary method) can be eliminated. Time-dependent diffusion measurements at the same isothermal temperature were carried out in Al-Cu liquids. Compared with the previous results measured by in-situ X-ray radiography, the obtained liquid diffusion coefficient in this work is believed to be influenced by convective flow. The present work further supports the idea that to obtain accurate diffusion constants in liquid metals, the measurement conditions must be well controlled, and there should be no temperature gradients or other disturbances.

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Diffusion measurements using the shear cell technique: Investigation of the role of Marangoni convection by pre-flight experiments on the ground and during the Foton M2 mission

Cited by 16 publications

References 14 publications

Influence of cross correlations on interdiffusion in Al-rich Al-Ni melts

Influence of cross correlations on interdiffusion in Al-rich Al-Ni melts

On the impact of free surfaces on the measurement of diffusion coefficients in metallic binary alloys using shear cells

A sliding cell technique for diffusion measurements in liquid metals

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