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Dynamic self-consistent field theory...
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Mihajlovic, Maja Lazar.
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Dynamic self-consistent field theory of inhomogeneous complex fluids under shear.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Dynamic self-consistent field theory of inhomogeneous complex fluids under shear./
作者:
Mihajlovic, Maja Lazar.
面頁冊數:
176 p.
附註:
Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3402.
Contained By:
Dissertation Abstracts International64-07B.
標題:
Engineering, Chemical. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3100077
ISBN:
9780496476688
Dynamic self-consistent field theory of inhomogeneous complex fluids under shear.
Mihajlovic, Maja Lazar.
Dynamic self-consistent field theory of inhomogeneous complex fluids under shear.
- 176 p.
Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3402.
Thesis (Ph.D.)--Polytechnic University, 2004.
Understanding and predicting the interplay between morphology and rheology of sheared, inhomogeneous, complex fluids is of great importance. Yet the modeling of such phenomena is in its infancy. We have developed a novel dynamic self-consistent field (DSCF) theory that makes possible a detailed computational study of such phenomena. Our DSCF theory couples the time evolution of chain conformation statistics with probabilistic transport equations for volume fractions and momenta, based on local conservation laws formulated on a segmental scale. To generate chain conformation statistics, we are using a modification of the lattice random walk formalism of Scheutjens and Fleer. Their static SCF theory is limited to equilibrium systems, since probability distributions are obtained by free energy minimization, assuming isotropic Gaussian chain conformations. In contrast, our DSCF approach accounts for explicit time evolution of the segmental and (anisotropic) conditional stepping probabilities used for generating chain conformations.
ISBN: 9780496476688Subjects--Topical Terms:
1018531
Engineering, Chemical.
Dynamic self-consistent field theory of inhomogeneous complex fluids under shear.
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Thesis (Ph.D.)--Polytechnic University, 2004.
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Understanding and predicting the interplay between morphology and rheology of sheared, inhomogeneous, complex fluids is of great importance. Yet the modeling of such phenomena is in its infancy. We have developed a novel dynamic self-consistent field (DSCF) theory that makes possible a detailed computational study of such phenomena. Our DSCF theory couples the time evolution of chain conformation statistics with probabilistic transport equations for volume fractions and momenta, based on local conservation laws formulated on a segmental scale. To generate chain conformation statistics, we are using a modification of the lattice random walk formalism of Scheutjens and Fleer. Their static SCF theory is limited to equilibrium systems, since probability distributions are obtained by free energy minimization, assuming isotropic Gaussian chain conformations. In contrast, our DSCF approach accounts for explicit time evolution of the segmental and (anisotropic) conditional stepping probabilities used for generating chain conformations.
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We have applied the DSCF model to a variety of isothermal inhomogenous fluids containing homopolymers, block copolymers and colloidal particles. In all the simulations, the system is equilibrated before the onset of a steady shear at the walls. Our results suggest that, on short time scales, the velocity evolution resembles shock wave propagation. In the course of time, the amplitude of the shock waves is viscously damped, giving rise to a Couette-like steady state velocity profile. This is also reflected in the temporal evolution of the tensor of the second moment of the end-to-end vector and the dissipative stress tensor. The two- and three-component polymer blends (with a diblock copolymer as the third component) exhibit the interfacial velocity and viscosity slip. The addition of a diblock copolymer suppresses the velocity, and therefore the viscosity slip. Colloidal particles suspended in a simple fluid exhibit layering near the walls. If a non-adsorbing polymer is also present in the suspension, our results reveal that the polymer is depleted around the colloidal particles. The steady state velocity profiles of all the studied system exhibit slip at the walls.
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http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3100077
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