Thermodiffusion of the tetrahydronaphthalene and dodecane mixture under high pressure and in porous medium

A thermodiffusion cell is used in order to perform Soret experiments on binary mixtures at high pressure and in the presence of a porous medium. The cell is validated at atmospheric pressure with toluene/hexane and the tetrahydronaphthalene/dodecane mixtures. The mass separation follows a diffusive behaviour when the cell is filled with a porous medium. At least three times the relaxation time is needed to have a good estimation of the Soret coefficients. From the transient state of the mass separation and using accepted values of the diffusion coefficient, the tortuosity of the porous medium was evaluated, too. Finally, experiments at high pressure were performed with the tetrahydronaphthalene/dodecane system. In these experiments, decreases of the Soret coefficient and of the tortuosity of the porous medium were measured as a function of the pressure

Mesure du coefficient Soret et étude de son rôle dans les phénomènes interfaciaux y compris au voisinage d'un front de cristallisation

Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe

Enhancing heat pipe performances using self-rewetting fluids in selene ground experiment

SELENE is the acronym for SELf-rewetting fluids for ENErgy management and refers to a fluid dynamics experiment that will fly on board the International Space Station (ISS). SELENE project is an experiment developed to study the effect of the solutal and heat transfers in heat pipe configuration using specific diagnostics. The test rig consists of a mono-grooved heat pipe designed to allow fluid observation and quantification of heat losses. Experiments are performed using Self-Rewetting fluids (SRWFs) and distilled water as reference fluid. Among the available SRWFs, an aqueous solution of n-Butanol is studied. This paper will present experimental results collected using as working fluid such a solution at 3 w% and distilled water. The experimental determination of thermal resistances of the test rig is performed with both fluids. An increase of the heat transfer in the case of the SRWF is observed. This increase becomes more significant at higher input power regimes. Details of the thermal profile along the grove are also provided.SCOPUS: cp.pinfo:eu-repo/semantics/publishe

Les expériences de mécanique des fluides en microgravité

info:eu-repo/semantics/nonPublishe

Contribution to the benchmark for ternary mixtures: Measurement of diffusion and Soret coefficients of ternary system tetrahydronaphtalene-isobutylbenzene-n-dodecane with mass fractions 80-10-10 at 25 °C

Abstract: This paper provides the molecular diffusion and Soret coefficients of the ternary system 1,2,3,4-tetrahydronaphtalene, isobutylbenzene, n -dodecane system at mass fractions 0.8-0.1-0.1 and temperature 25 °C for implementation into the benchmark presented in this topical issue. The Soret coefficients are determined by digital interferometry using the data of DSC-DCMIX microgravity experiment. The method used takes into account the influence of the thermal field on the Soret separations and the selection of the image processing techniques results in reproducible Soret coefficients.The diffusion coefficients are obtained by the Open Ended Capillary technique The fitting of the data collected through a set of two complementary experimental runs allows retrieving the four Fickian diffusion coefficients. Graphical abstract: [Figure not available: see fulltext.]SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Kinetic of the Soret effect and its measurement under microgravity conditions

info:eu-repo/semantics/publishe

Soret coefficients of organic solutions measured in the microgravity SCM experiment and by the flow and Bénard cells

Soret coefficients of aqueous solutions of methyl, ethyl, isopropyl, and n-butyl alcohols and of solutions of methyl and ethyl alcohols in benzene have been measured in the Soret coefficient measurement (SCM) experiment under microgravity conditions on board the orbital platform EURECA at a mean temperature of 37.5°C. These reference measurements will allow us to improve the understanding of the ground based results and to calibrate the ground based setup. This point is discussed with the values that we obtained by the flow cell technique and for systems that exhibited a hysteretic loop in the Schmidt-Milverton plots in the Bénard cell at a mean temperature of 37°C.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Thermomigration experiment on board EURECA

30th COSPAR Meeting (Hamburg, July 1994)info:eu-repo/semantics/publishe