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Wyświetlanie 1-2 z 2
Tytuł:
Elastic properties of the rectangular crystalline phase of planar hard cyclic pentamers
Autorzy:
Tretiakov, K. V.
Wojciechowski, K. W.
Powiązania:
https://bibliotekanauki.pl/articles/1965832.pdf
Data publikacji:
2001
Wydawca:
Politechnika Gdańska
Tematy:
elastic constants
Poisson ratio
hard molecule
anisotropic body
Monte Carlo simulations
computer simulation
close packing
orientational phase transition
Opis:
Structural and elastic properties of the densest known solid phase of two-dimensional (2D) system of hard cyclic pentamers (each pentamer is composed of five discs which centres are placed at vertices of a perfect pentagon of sides equal to the disc diameter, delta) are studied by Monte Carlo simulations. The present study confirms that at high densities the pentamers form a 2D solid structure of rectangular lattice with two pentamers (which librate, without rotation, around their mean orientations) in the unit cell. Elastic constants calculated for this structure show that, in contrast to densely packed 2D hard cyclic heptamers (composed of seven discs of centres forming a perfect heptagon of sides equal to the disc diameter delta), the pentamers do not exhibit anomalous Poisson's ratios.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 3; 331-340
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dispersion of colloidal agglomerate in mesoscale modelled by a hybrid fluid particle model elastic properties of the rectangular crystalline phase of planar hard cyclic pentamers
Autorzy:
Dzwinel, W.
Yuen, D. A.
Powiązania:
https://bibliotekanauki.pl/articles/1965869.pdf
Data publikacji:
2001
Wydawca:
Politechnika Gdańska
Tematy:
fluid particle model
mesoscopic flow
colloidal agglomerate
fragmentation
agglomeration
Opis:
The dispersion of the agglomerating fluid process involving colloids has been investigated at the mesoscale level by a discrete particle approach - the hybrid fluid particle model (FPM). Dynamical processes occurring in the granulation of colloidal agglomerate in solvents are severely influenced by coupling between the dispersed microstructures and the global flow. On the mesoscale this coupling is further exacerbated by thermal fluctuations, particle-particle interactions between colloidal beds and hydrodynamic interactions between colloidal beds and the solvent. Using the method of FPM, we have tackled the problem of dispersion of a colloidal slab being accelerated in a long box filled with a fluid. Our results show that the average size of the agglomerated fragments decrease with increasing shearing rate gamma, according to the power-law A*gamma k, where k is around 2. For larger values of gamma, the mean size of the agglomerate S_avg increases slowly with gamma from the collisions between the aggregates and the longitudinal stretching induced by the flow. The proportionality constant A increases exponentially with the scaling factor of the attractive forces acting between the colloidal particles. The value of A shows a rather weak dependence on the solvent viscosity. However, A increases proportionally with the scaling factor of the colloid-solvent dissipative interactions. These results may be applied to enhance our understanding concerning the nonlinear complex interaction occurring in mesoscopic flows such as blood flow in small vessels.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 3; 355-371
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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