Abstract
Abstract
We performed ground-based experiments on the sample polystyrene–toluene–cyclohexane in order to complement the experimental activities in microgravity conditions related to the ESA projects DCMIX4 and Giant Fluctuations. After applying a stabilizing thermal gradient by heating from above a layer of the fluid mixture, we studied over many hours the density variations in the bidimensional horizontal field by means of a Shadowgraph optical setup. The resulting images evidence the appearance of convective instability after a diffusive time associated with the binary molecular solvent consisting of toluene and cyclohexane, confirming the negative sign of the Soret coefficient of this mixture. After a larger diffusive time related to mass diffusion of the polystyrene in the binary solvent, convection was suppressed by the increasing stabilizing density gradient originated by the Soret-induced concentration gradient of the polymer. This is compatible with a positive sign of the Soret coefficient of the polymer in the binary solvent.
Graphic Abstract
Funder
Centre National d’Etudes Spatiales
Agence Nationale de la Recherche
European Space Agency
Comunidad de Madrid
Publisher
Springer Science and Business Media LLC
Subject
Surfaces and Interfaces,General Materials Science,General Chemistry,Biophysics,Biotechnology
Reference37 articles.
1. A. Ryskin, H.W. Müller, H. Pleiner, Phys. Rev. E 67, 046302 (2003)
2. J.K. Platten, J.C. Legros, Convection in Liquids (Springer, New York, 1984)
3. S. Mazzoni, Ph.D. Thesis, Università degli Studi di Milano, Italy (2005)
4. S. Mazzoni, F. Giavazzi, R. Cerbino, M. Giglio, A. Vailati, Phys. Rev. Lett. 100, 188104 (2008)
5. M. Braibanti, P.A. Artola, P. Baaske et al., Eur. Phys. J. E 42, 1 (2019)
Cited by
6 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献