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Giant Fluctuations Induced by Thermal Diffusion in Complex Liquids

Vailati, Alberto ; Baaske, Philipp ; Bataller, Henri ; Bolis, Serena ; Braibanti, Marco ; Carpineti, Marina ; Cerbino, Roberto ; Croccolo, Fabrizio ; Dewandel, Jean-Luc ; Donev, Aleksandar ; García-Fernández, Loreto ; Giavazzi, Fabio ; Haslinger, Robert ; Hens, Steven ; Knauer, Maria ; Köhler, Werner ; Kufner, Ewald ; Ortiz de Zárate, José M. ; Peeters, Jeroen ; Schwarz, Christian J. ; Silkina, Inese ; Xu, Shenghua ; Zapf, Daniel

Microgravity science and technology, 2020-10, Vol.32 (5), p.873-887 [Periódico revisado por pares]

Dordrecht: Springer Netherlands

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Título:
Giant Fluctuations Induced by Thermal Diffusion in Complex Liquids
Autor: Vailati, Alberto ; Baaske, Philipp ; Bataller, Henri ; Bolis, Serena ; Braibanti, Marco ; Carpineti, Marina ; Cerbino, Roberto ; Croccolo, Fabrizio ; Dewandel, Jean-Luc ; Donev, Aleksandar ; García-Fernández, Loreto ; Giavazzi, Fabio ; Haslinger, Robert ; Hens, Steven ; Knauer, Maria ; Köhler, Werner ; Kufner, Ewald ; Ortiz de Zárate, José M. ; Peeters, Jeroen ; Schwarz, Christian J. ; Silkina, Inese ; Xu, Shenghua ; Zapf, Daniel
Assuntos: Aerospace Technology and Astronautics ; Binary mixtures ; Classical and Continuum Physics ; Computational fluid dynamics ; Concentration gradient ; Condensed Matter ; Engineering ; Fluctuations ; Fluid flow ; Hydrodynamics ; International Space Station ; Macromolecules ; Microgravity ; Optical instruments ; Original Article ; Performance tests ; Physics ; Polymers ; Space Exploration and Astronautics ; Space Sciences (including Extraterrestrial Physics ; Space stations ; Spacecraft components ; The Effect of Gravity on Physical and Biological Phenomena ; Thermal diffusion ; Transport processes
É parte de: Microgravity science and technology, 2020-10, Vol.32 (5), p.873-887
Descrição: The GRADFLEX experiment of ESA has shown that under microgravity conditions a stationary thermodiffusion process is accompanied by giant non-equilibrium fluctuations with size as large as the size of the sample. In the presence of small concentration gradients, the features of the non-equilibrium fluctuations can be described by means of linearized hydrodynamics. However, the linear models are not suitable to describe most cases of applicative interest, such as fluctuations induced by large gradients and under non-stationary conditions. Moreover, presently the investigation of non-equilibrium fluctuations has mainly involved single component fluids and binary mixtures, but recently transport processes in ternary mixtures have attracted increasing interest due to the experiments performed on the International Space Station in the framework of the DCMIX project of ESA. The Giant Fluctuations (NEUF-DIX) project of ESA will investigate non-equilibrium fluctuations during diffusive processes occurring in complex multi-component mixtures, where one of the components is a macromolecule, such as a polymer, a colloid or a protein. Important objectives will be the exploration of the features of the fluctuations under non-ideal conditions, such as large gradients, transient processes, and concentrated samples, and the understanding of how the fluctuations affect the interactions between macromolecules. The project involves the development of a dedicated facility, consisting of an array of shadowgraph optical instruments working in parallel, each one equipped with a thermal gradient cell. Here we outline the design concept of the facility and the results of performance tests performed on a breadboard to evaluate the suitability of the designed instrument to carry out scientific measurements of non-equilibrium concentration fluctuations in space.
Editor: Dordrecht: Springer Netherlands
Idioma: Inglês

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Giant Fluctuations Induced by Thermal Diffusion in Complex Liquids

Dordrecht: Springer Netherlands

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