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Digitale Medien

Up to the unsteadiness of axisymmetric thermocapillary flows in a laterally heated liquid bridge (2000)

Kasperski, G. ; Batoul, A. ; Labrosse, G.

[S.l.] : American Institute of Physics (AIP)

Physics of Fluids 12 (2000), S. 103-119

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ISSN: 1089-7666

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Axisymmetric flows of fluids of various Prandtl numbers, Pr, in a cylindrical and undeformable liquid bridge submitted to a lateral heating are studied in a zero gravity environment, up to their transitions to unsteadiness. The governing equations are solved numerically by a pseudospectral scheme. The results depend on Pr, in a nonmonotonic fashion, as, for instance, the threshold of the onset to unsteadiness. It has always been reached, except for our Pr=1 experiment, run up to a Marangoni number value Ma=106. The steady flows at very high Reynolds numbers (up to 107) offer a rich structure. A first incursion into unsteadiness shows different flow structure evolutions, depending on whether Pr is smaller or larger than one. © 2000 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.870286

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2

Digitale Medien

On the numerical treatment of viscous singularities in wall-confined thermocapillary convection (2000)

Kasperski, G. ; Labrosse, G.

[S.l.] : American Institute of Physics (AIP)

Physics of Fluids 12 (2000), S. 2695-2697

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ISSN: 1089-7666

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Confined thermocapillary flows often present a viscous singularity where free and solid surfaces meet. Any computational treatment of these flows must filter this singularity, either explicitly by modifying the boundary conditions of the problem, or implicitly by using finite precision methods. The effect of an explicit polynomial filtering is here examined for an axisymmetric side-heated liquid bridge, leading to two results: (i) thermally convective flows converge very slowly with the filtering scale; the numerical experiments must therefore be conducted carefully in order to get physically relevant results; (ii) stream-function and temperature are not suitable test variables for estimating this convergence. © 2000 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1287513

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3

Digitale Medien

Absolute total cross-section measurements for electron scattering from silicon tetrachloride, SiCl , molecules (1999)

Możejko, P. ; Kasperski, G. ; Szmytkowski, Cz. ; [weitere]

Springer

The European physical journal 6 (1999), S. 481-485

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ISSN: 1434-6079

Schlagwort(e): PACS. 34.80 Electron scattering

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract: The absolute total cross-sections for electron scattering on SiCl4 molecules have been measured in two distinct electron-transmission experiments, in Gdansk and in Trento laboratory, for impact energy ranging from 0.3 to 250 eV and from 75 to 4000 eV, respectively. The e--SiCl4 total cross-section function shows two very distinct resonant-like features: the strong peak at 1.9 eV and much broader main maximum centered near 10 eV with some additional substructure close to 5 eV. The present results are compared with low-energy total experimental data and elastic theoretical calculations for electron collisions with silicon tetrachloride molecules.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s100500050373

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