Browsing by Subject "Viscosity"
Now showing items 1-20 of 21
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Article
Boundary layers for self-similar viscous approximations of nonlinear hyperbolic systems
(2013)We provide a precise description of the set of residual boundary conditions generated by the self-similar viscous approximation introduced by Dafermos et al. We then apply our results, valid for both conservative and ...
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Conference Object
Computational study of the Kuramoto-Sivashinsky equation
(Soc for Industrial & Applied Mathematics Publ, 1996)We report the results of extensive numerical experiments on the Kuramoto-Sivashinsky equation in the strongly chaotic regime as the viscosity parameter is decreased and increasingly more linearly unstable modes enter the ...
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Article
Incompressible Poiseuille flows of Newtonian liquids with a pressure-dependent viscosity
(2011)The pressure-dependence of the viscosity becomes important in flows where high pressures are encountered. Applications include many polymer processing applications, microfluidics, fluid film lubrication, as well as simulations ...
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Article
Newtonian Poiseuille flows with pressure-dependent wall slip
(2013)The effect of pressure-dependent slip at the wall in steady, isothermal, incompressible Poiseuille flows of a Newtonian liquid is investigated. Exponential dependence of the slip coefficient on the pressure is assumed and ...
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Doctoral Thesis Open Access
The nonlinear parabolic thin obstacle problem
(Πανεπιστήμιο Κύπρου, Σχολή Θετικών και Εφαρμοσμένων Επιστημών / University of Cyprus, Faculty of Pure and Applied Sciences, 2020-05)Στόχος της παρούσας διατριβής είναι η ανάπτυξη της θεωρίας της ομαλότητας για Πρόβλημα Συνοριακών Τιμών (ΠΣΤ) και Προβλήματα Ελευθέρου Συνόρου τα οποία διέπονται από πλήρως μη-γραμμικούς παραβολικούς τελεστές. Το κείμενο ...
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Doctoral Thesis Open Access
Numerical and semi-analytical solutions of viscoplastic Poiseuille and Couette flows
(Πανεπιστήμιο Κύπρου, Σχολή Θετικών και Εφαρμοσμένων Επιστημών / University of Cyprus, Faculty of Pure and Applied Sciences, 2009-01)Η παρούσα διατριβή περιλαμβάνει τις αριθμητικές και ημι-αναλυτικές λύσεις ιξωδοπλαστικών ροών Poiseuille και Couette. Αρχικά επιλύουμε αριθμητικά διάφορες ροές διακοπής ρευστών Bingham χρησιμοποιώντας το ομαλοποιημένο ...
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Conference Object
Numerical simulation of injection mold filling for semi-solid materials
(ASME, 1995)Processing of metals and metal matrix composites in the semi-solid state is an emerging new technology and is becoming increasingly popular. This method provides several advantages over the traditional liquid state processing ...
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Article
On the stability of the simple shear flow of a Johnson-Segalman fluid
(1998)We solve the time-dependent simple shear flow of a Johnson-Segalman fluid with added Newtonian viscosity. We focus on the case where the steady-state shear stress/shear rate curve is not monotonic. We show that, in addition ...
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Article
Perturbation solution of the compressible annular Poiseuille flow of a viscous fluid
(2010)The isothermal annular Poiseuille flow of a weakly compressible Newtonian liquid with constant shear and bulk viscosities is considered. A linear equation of state is assumed and a perturbation analysis in terms of the ...
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Article
Perturbation solutions of Poiseuille flows of weakly compressible Newtonian liquids
(2009)Both the planar and axisymmetric isothermal Poiseuille flows of weakly compressible Newtonian liquids with constant shear and bulk viscosities are solved up to the second-order. A linear equation of state is assumed and a ...
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Doctoral Thesis Open AccessOpen Access
Perturbation solutions of weakly compressible Newtonian Poiseuille flows with pressure-dependent viscosity
(Πανεπιστήμιο Κύπρου, Σχολή Θετικών και Εφαρμοσμένων Επιστημών / University of Cyprus, Faculty of Pure and Applied Sciences, 2012-05)Στη διατριβή αυτή θεωρούμε Νευτώνειες ροές Poiseuille όπου η πυκνότητα ή/και το ιξώδες είναι συναρτήσεις της πίεσης. Όπου είναι δυνατόν, βρίσκουμε ακριβείς λύσεις ή προσεγγιστικές λύσεις μέσω ασυμπτωτικών αναπτυγμάτων τα ...
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Article
Phase behavior of random and ABC triblock methacrylic polyampholytes with poly(vinyl alcohol) in water: effect of pH and salt
(1995)ABC triblock and random methacrylic polyampholytes of molecular weight 4,000 g mol-1 with various base-neutral-acid compositions were examined for their phase separation behavior, each in an aqueous mixture with poly(vinyl ...
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Article
Prediction of intrinsic viscosity in polymer-solvent combinations using a QSPR model
(2006)In this work, a linear quantitative structure-property relationship (QSPR) model is presented for the prediction of intrinsic viscosity in polymer solutions. The model was produced by using the multiple linear regression ...
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Article
Rate of convergence for vanishing viscosity approximations to hyperbolic balance laws
(2011)The rate of convergence for vanishing viscosity approximations to hyperbolic balance laws is established. The result applies to systems that are strictly hyperbolic and genuinely nonlinear with a source term satisfying a ...
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Conference Object
Rheology of semisolid suspensions
(Affiliation: Semisolid Processing Laboratory, Metal Processing Institute, WPI, Worcester, MA 01609, United StatesAffiliation: Polytech. University of Puerto Rico, Mechanical Engineering Department, San Juan 00918, Puerto RicoAffiliation: Institute for Problems in Mechanics, Russian Academy of Science, pr. Vemadskogo, 101, 117526 Moscow, Russian FederationCorrespondence Address: Alexandrou, A.N.Semisolid Processing Laboratory, Metal Processing Institute, WPI, Worcester, MA 01609, United States, 2000)The effective use of the semisolid process presumes a good theoretical framework to describe it. The understanding of semisolid behavior should be based upon a combination of basic and empirical knowledge in versatile ...
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Article
A simplified structure-based model using standard turbulence scale equations: computation of rotating wall-bounded flows
(2006)Two linear eddy-viscosity models, the v2-f and k-ω models, have been combined with an algebraic structure-based algorithm for the evaluation of the Reynolds stresses. This closure was originally designed as an integral ...
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Conference Object
Stochastic optimal control subject to variational norm uncertainty: Viscosity subsolution for generalized HJB inequality
(2009)This paper is concerned with optimization of stochastic uncertain systems, when systems are described by measures and the pay-off by a linear functional on the space of measure, on general abstract spaces. Robustness is ...
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Article
Structural effects of crosslinking a biopolymer hydrogel derived from marine mussel adhesive protein
(2006)In an effort to explore new biocompatible substrates for biomedical technologies, we present a structural study on a crosslinked gelatinous protein extracted from marine mussels. Prior studies have shown the importance of ...
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Article
Synthesis, characterization and evaluation of amphiphilic star copolymeric emulsifiers based on methoxy hexa(ethylene glycol) methacrylate and benzyl methacrylate
(2005)Amphiphilic star copolymers were synthesized by sequential monomer and cross-linker additions using group transfer polymerization (GTP). Benzyl methacrylate (BzMA) and methoxy hexa(ethylene glycol) methacrylate (HEGMA) ...
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Article
Synthesis, characterization, and evaluation as emulsifiers of amphiphilic-ionizable aromatic methacrylate ABC triblock terpolymers
(2004)Four isomeric terpolymers based on benzyl methacrylate (BzMA, nonionic hydrophobic), 2-(dimethylamino)ethyl methacrylate (DMAEMA, ionizable hydrophilic), and methoxyhexa(ethylene glycol) methacrylate (HEGMA, nonionic ...