Fractal fronts of diffusion in microgravity
Alberto Vailati,Roberto Cerbino,Stefano Mazzoni,Stefano Mazzoni,Christopher J. Takacs,David S. Cannell,Marzio Giglio +6 more
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TLDR
Experimental results obtained in microgravity during the flight of the FOTON M3 satellite find that during a diffusion process a dilute polymer solution exhibits scale-invariant concentration fluctuations with sizes ranging up to millimetres, and relaxation times as large as 1,000 s.Abstract:
Spatial scale invariance represents a remarkable feature of natural phenomena. A ubiquitous example is represented by miscible liquid phases undergoing diffusion. Theory and simulations predict that in the absence of gravity diffusion is characterized by long-ranged algebraic correlations. Experimental evidence of scale invariance generated by diffusion has been limited, because on Earth the development of long-range correlations is suppressed by gravity. Here we report experimental results obtained in microgravity during the flight of the FOTON M3 satellite. We find that during a diffusion process a dilute polymer solution exhibits scale-invariant concentration fluctuations with sizes ranging up to millimetres, and relaxation times as large as 1,000 s. The scale invariance is limited only by the finite size of the sample, in agreement with recent theoretical predictions. The presence of such fluctuations could possibly impact the growth of materials in microgravity.read more
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Thermodiffusion or Soret effect: Historical review
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TL;DR: A historical database of experimental and theoretical works has been offered and major challenges, limitations, and technical hitches of performing experiments on ground (earth) condition has been selected, and cautiously deliberated.
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Staggered Schemes for Fluctuating Hydrodynamics
Florencio Balboa Usabiaga,John B. Bell,Rafael Delgado-Buscalioni,Aleksandar Donev,Thomas G. Fai,Boyce E. Griffith,Charles S. Peskin +6 more
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Digital Fourier microscopy for soft matter dynamics
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Temporal integrators for fluctuating hydrodynamics
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References
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