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

Ruíz, Xavier; Sáez, Núria; Gavaldà, Jna.; Pallarès, Jordi

doi:10.1016/j.ijheatmasstransfer.2014.10.067

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Experiments Under Different Gravity Conditions1

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“…Specially designed isolators which decouple the experimental setup from the structure of the platform reduce this influence Smith et al (2009). Marangoni convection caused by differences in surface tension due to bubbles or free both on earth and in microgravity Ruiz et al (2015), Pallarés (2011), Roşu-Pflumm et al (2009), Kargl et al (2013).…”

Section: Experiments Under Different Gravity Conditionsmentioning

confidence: 99%

Influence of Gravity on Atomic Mobility in a Liquid

Sondermann

Voigtmann

Meyer

2022

Microgravity Sci. Technol.

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Measurements of diffusion and thermodiffusion in liquids are very sensitive to convection caused for example by buoyancy. To reduce the impact of buoyancy-driven convection, benchmark experiments are performed in microgravity conditions. Here, we discuss the general influence of gravity on atomic mobility. The gravitational Péclet number and the gravitational length can be used to assess this influence. They show that the diffusion processes of atoms in a liquid is not affected by Earth’s gravitational force but that the process is dominated by the thermal energy of the atoms. Data from experiments under different gravity conditions ranging from $$10^{-5}g$$ 10 - 5 g to $$10^6g$$ 10 6 g are summarized. They confirm that interdiffusion is only influenced by accelerations that are orders of magnitude larger than Earth’s gravity.

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Section: Experiments Under Different Gravity Conditionsmentioning

confidence: 99%