Browsing by Subject "Herschel-Bulkley fluids"

Now showing items 1-15 of 15

    • Conference Object  

      3-D flow of Herschel-Bulkley fluids 

      Burgos, Gilmer R.; Alexandrou, Andreas N. (ASME, 1998)
      The flow of Herschel-Bulkley fluids through a sudden 3-D square with expansion height ratio of 2:1 is studied numerically by solving the mass and momentum conservation equations along with a continuous constitutive relation. ...
    • Conference Object  

      Cessation flows of bingham plastics with slip at the wall 

      Damianou, Y.; Philippou, Maria; Kaoullas, G.; Georgiou, Georgios C. (National Technical University of Athens, 2013)
      We use finite elements in space and a fully implicit scheme in time in order to solve the cessation of axisymmetric Poiseuille flow of a Bingham plastic under the assumption that slip occurs along the wall. The Papanastasiou ...
    • Article  

      Cessation of viscoplastic Poiseuille flow with wall slip 

      Damianou, Y.; Philippou, Maria; Kaoullas, G.; Georgiou, Georgios C. (2014)
      We solve numerically the cessation of axisymmetric Poiseuille flow of a Herschel-Bulkley fluid under the assumption that slip occurs along the wall. The Papanastasiou regularization of the constitutive equation is employed. ...
    • Article  

      Combined effects of compressibility and slip in flows of a Herschel-Bulkley fluid 

      Damianou, Y.; Georgiou, Georgios C.; Moulitsas, I. (2013)
      In this work, the combined effects of compressibility and slip in Poiseuille flows of Herschel-Bulkley fluids are investigated. The density is assumed to obey a linear equation of state, and wall slip is assumed to follow ...
    • Article  

      Flow instabilities of Herschel-Bulkley fluids 

      Alexandrou, Andreas N.; Le Menn, P.; Georgiou, Georgios C.; Entov, V. (2003)
      We investigate numerically the interactions of two-dimensional jets of Bingham plastic and Herschel-Bulkley fluids with a vertical surface at a distance from the die exit. This problem simulates the early stages of filling ...
    • Article  

      Flow instabilities of Herschel-Bulkley fluids 

      Alexandrou, Andreas N.; Menn, P. Le; Georgiou, G.; Entov, V. (2003)
      We investigate numerically the interactions of two-dimensional jets of Bingham plastic and Herschel-Bulkley fluids with a vertical surface at a distance from the die exit. This problem simulates the early stages of filling ...
    • Article  

      On the early breakdown of semisolid suspensions 

      Alexandrou, Andreas N.; Georgiou, Georgios C. (2007)
      Semisolid materials are suspensions of metal alloys which are processed while in a mushy state. In this state, the suspensions behave as viscoplastic materials with time-dependent material properties. During processing, ...
    • Article  

      On the early breakdown of semisolid suspensions 

      Alexandrou, Andreas N.; Georgiou, G. (2007)
      Semisolid materials are suspensions of metal alloys which are processed while in a mushy state. In this state, the suspensions behave as viscoplastic materials with time-dependent material properties. During processing, ...
    • Article  

      On the modeling of semisolid suspensions 

      Alexandrou, Andreas N. (2008)
      Due to the distinct rheology of semisolid slurries the process has well established advantages over competing near-net-shape manufacturing technologies. Despite the obvious advantages of the process its adoption by the ...
    • Article  

      Predictions of structure breakdown, buildup and shear banding in semisolid suspensions 

      Alexandrou, Andreas N.; Constantinos, N.; Georgiou, Georgios C. (2008)
      When SSM material is subjected to a sudden transient the rate of buildup (aging) is negligible compared to the rate of breakdown (shear rejuvenation). While this is generally true, due to prolonged processing or the geometry ...
    • Article  

      Predictions of structure breakdown, buildup and shear banding in semisolid suspensions 

      Alexandrou, Andreas N.; Constantinos, N.; Georgiou, G. (2008)
      When SSM material is subjected to a sudden transient the rate of buildup (aging) is negligible compared to the rate of breakdown (shear rejuvenation). While this is generally true, due to prolonged processing or the geometry ...
    • Conference Object  

      Rheological effects of strusture breakdown in semisolid slurries 

      Alexandrou, Andreas N.; Florides, G. C.; Georgiou, Georgios C.; Apelian, D. (2004)
      An essential element for the integration of the semisolid metal (SSM) process in the production of complex commercial components is the availability of accurate mathematical and computational tools that could describe both ...
    • Conference Object  

      Rheological effects of strusture breakdown in semisolid slurries 

      Alexandrou, Andreas N.; Florides, G. C.; Georgiou, G. C.; Apelian, D. (Affiliation: Department of Mechanical and Industrial Engineering, University Cyprus, P.O.Box 20537, 1678 Nicosia, CyprusAffiliation: Department of Mathematics and Statistics, University of Cyprus, P.O.Box 20537, 1678 Nicosia, CyprusAffiliation: Metal Processing Institute, WPI, Worcester, MA, United StatesCorrespondence Address: Alexandrou, A.N.Department of Mechanical and Industrial Engineering, University Cyprus, P.O.Box 20537, 1678 Nicosia, Cyprus, 2004)
      An essential element for the integration of the semisolid metal (SSM) process in the production of complex commercial components is the availability of accurate mathematical and computational tools that could describe both ...
    • Article  

      Steady Herschel-Bulkley fluid flow in three-dimensional expansions 

      Alexandrou, Andreas N.; McGilvreay, T. M.; Burgos, G. (2001)
      In this paper we study steady flow of Herschel-Bulkley fluids in a canonical three-dimensional expansion. The fluid behavior was modeled using a regularized continuous constitutive relation, and the flow was obtained ...
    • Article  

      Viscoplastic Poiseuille flow in a rectangular duct with wall slip 

      Damianou, Y.; Georgiou, Georgios C. (2014)
      We solve numerically the Poiseuille flow of a Herschel-Bulkley fluid in a duct of rectangular cross section under the assumption that slip occurs along the wall following a slip law involving a non-zero slip yield stress. ...