• Article  

      Boundary layers for self-similar viscous approximations of nonlinear hyperbolic systems 

      Christoforou, Cleopatra; Spinolo, L. V. (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 ...
    • Conference Object  

      Computational study of the Kuramoto-Sivashinsky equation 

      Smyrlis, Yiorgos-Sokratis; Papageorgiou, Demetrios T. (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 ...
    • Article  

      Incompressible Poiseuille flows of Newtonian liquids with a pressure-dependent viscosity 

      Kalogirou, Anna; Poyiadji, Stella; Georgiou, Georgios C. (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 ...
    • Article  

      Newtonian Poiseuille flows with pressure-dependent wall slip 

      Panaseti, Pandelitsa; Housiadas, Kostas D.; Georgiou, Georgios C. (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 ...
    • Doctoral Thesis  Open Access

      The nonlinear parabolic thin obstacle problem 

      Chatzigeorgiou, Georgiana G. (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 ...
    • Doctoral Thesis  Open Access

      Numerical and semi-analytical solutions of viscoplastic Poiseuille and Couette flows 

      Chatzimina, Maria K. (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 ...
    • Conference Object  

      Numerical simulation of injection mold filling for semi-solid materials 

      Ahmed, Alauddin; Alexandrou, Andreas N. (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 ...
    • Article  

      On the stability of the simple shear flow of a Johnson-Segalman fluid 

      Georgiou, Georgios C.; Vlassopoulos, Dimitris (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 ...
    • Article  

      Perturbation solution of the compressible annular Poiseuille flow of a viscous fluid 

      Joseph, S.; Joseph, L.; Georgiou, Georgios C. (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 ...
    • Article  

      Perturbation solutions of Poiseuille flows of weakly compressible Newtonian liquids 

      Taliadorou, Eleni G.; Neophytou, Marios; Georgiou, Georgios C. (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 ...
    • Doctoral Thesis  Open AccessOpen Access

      Perturbation solutions of weakly compressible Newtonian Poiseuille flows with pressure-dependent viscosity 

      Poyiadji, Stella V. (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 ...
    • Article  

      Phase behavior of random and ABC triblock methacrylic polyampholytes with poly(vinyl alcohol) in water: effect of pH and salt 

      Patrickios, Costas S.; Hertler, Walter R.; Hatton, T. Alan (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 ...
    • Article  

      Prediction of intrinsic viscosity in polymer-solvent combinations using a QSPR model 

      Afantitis, Antreas; Melagraki, G.; Sarimveis, H.; Koutentis, Panayiotis Andreas; Markopoulos, J.; Igglessi-Markopoulou, O. (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 ...
    • Article  

      Rate of convergence for vanishing viscosity approximations to hyperbolic balance laws 

      Christoforou, Cleopatra; Trivisa, K. (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 ...
    • Conference Object  

      Rheology of semisolid suspensions 

      Alexandrou, Andreas N.; Burgos, G. R.; Entov, V. M. (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 ...
    • Article  

      A simplified structure-based model using standard turbulence scale equations: computation of rotating wall-bounded flows 

      Kassinos, Stavros C.; Langer, C. A.; Kalitzin, G.; Iaccarino, G. (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 ...
    • Conference Object  

      Stochastic optimal control subject to variational norm uncertainty: Viscosity subsolution for generalized HJB inequality 

      Rezaei, F.; Charalambous, Charalambos D.; Ahmed, N. U. (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 ...
    • Article  

      Structural effects of crosslinking a biopolymer hydrogel derived from marine mussel adhesive protein 

      Loizou, Elena; Weisser, J. T.; Dundigalla, A.; Porcar, L.; Schmidt, G.; Wilker, J. J. (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 ...
    • Article  

      Synthesis, characterization and evaluation of amphiphilic star copolymeric emulsifiers based on methoxy hexa(ethylene glycol) methacrylate and benzyl methacrylate 

      Hadjiyannakou, Stella C.; Triftaridou, Aggeliki I.; Patrickios, Costas S. (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) ...
    • Article  

      Synthesis, characterization, and evaluation as emulsifiers of amphiphilic-ionizable aromatic methacrylate ABC triblock terpolymers 

      Kyriacou, M. S.; Hadjiyannakou, Stella C.; Vamvakaki, Maria; Patrickios, Costas S. (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 ...