Browsing by Author "Alexandrou, Andreas N."
Now showing items 41-60 of 101
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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 ...
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Article
On the steady-state advancement of fingers and bubbles in a Hele-Shaw cell filled by a non-Newtonian fluid
Alexandrou, Andreas N.; Entov, V. (1997)The problem of steady-state propagation of a finger or a bubble of inviscid fluid through a Hele-Shaw cell filled by a viscous non-Newtonian, including visco-plastic (Bingham) fluid is addressed. Only flows symmetric ...
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Article
On the transition to turbulence of a viscoplastic fluid past a confined cylinder: A numerical study
Kanaris, N.; Kassinos, Stavros C.; Alexandrou, Andreas N. (2015)Three-dimensional direct numerical simulations of a Bingham fluid flowing past a confined circular cylinder have been used in order to investigate viscoplastic effects in the wake-transition regime. The case of a cylinder ...
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Article
Parameter estimation for semi-solid aluminum alloys using transient experiments
Alexandrou, Andreas N.; Georgiou, Georgios C.; Tonmukayakul, N.; Apelian, D. (2006)A rotating vane-cup rheometer is used to determine the rheological properties of semi-solid slurries, and a procedure is established for characterizing the rheology with emphasis given to the proper and self-consistent ...
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Article
Parameter estimation for semi-solid aluminum alloys using transient experiments
Alexandrou, Andreas N.; Georgiou, G.; Tonmukayakul, N.; Apelian, D. (2006)A rotating vane-cup rheometer is used to determine the rheological properties of semi-solid slurries, and a procedure is established for characterizing the rheology with emphasis given to the proper and self-consistent ...
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Article
Parametric study and cost analysis of a solar-heating-and-cooling system for detached single-family households in hot climates
Arsalis, A.; Alexandrou, Andreas N. (2015)A solar-heating-and-cooling (SHC) system, consisting of a flat-plate solar collector array, a hot water storage tank, and an absorption chiller unit is designed and modeled to satisfy thermal loads (space heating, domestic ...
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Conference Object
Particle simulation of crystal growth and settling under variable gravity
Gatsonis, N. A.; Ongewe, B.; Alexandrou, Andreas N.; Jr, A. Sacco (American Institute of Aeronautics and Astronautics Inc, AIAA, 1999)A model that describes crystal growth and motion is presented. The model is based on concept of the direct simulation Monte Carlo and molecular dynamics methods and includes spherical crystal particles, nutrients species ...
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Conference Object
Particle-fluid dynamics under variable gravity conditions
Alexandrou, Andreas N.; Lemdiasov, R. A.; Gatsonis, N. A.; Jr, A. Sacco (Affiliation: Mechanical Engineering Department, Worcester Polytechnic Institute, Worcester, MA 01609, United StatesAffiliation: Northeastern University, Boston, MA 02111, United StatesCorrespondence Address: Mechanical Engineering Department, Worcester Polytechnic Institute, Worcester, MA 01609, United States, 2000)Crystals grown from specially prepared liquid solutions have important industrial applications. The efficiency of these crystals is usually a function of their size. Therefore, during the synthesis of the crystals, it is ...
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Article
Performance of the finite volume method in solving regularised Bingham flows: Inertia effects in the lid-driven cavity flow
Syrakos, A.; Georgiou, Georgios C.; Alexandrou, Andreas N. (2014)We extend our recent work on the creeping flow of a Bingham fluid in a lid-driven cavity, to the study of inertial effects, using a finite volume method and the Papanastasiou regularisation of the Bingham constitutive model ...
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Article
Performance of the finite volume method in solving regularised Bingham flows: Inertia effects in the lid-driven cavity flow
Syrakos, A.; Georgiou, G. C.; Alexandrou, Andreas N. (2014)We extend our recent work on the creeping flow of a Bingham fluid in a lid-driven cavity, to the study of inertial effects, using a finite volume method and the Papanastasiou regularisation of the Bingham constitutive model ...
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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 ...
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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 ...
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Article
Preface to Special Issue: Papers from HSR 2017 - 8th International Meeting of the Hellenic Society of Rheology, Limassol, Cyprus, July 12-14, 2017
Georgiou, G. C.; Alexandrou, Andreas N. (2018)
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Article
Preface to Special Issue: Papers from HSR 2017—8th International Meeting of the Hellenic Society of Rheology, Limassol, Cyprus, July 12–14, 2017
Georgiou, Georgios C.; Alexandrou, Andreas N. (2018)
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Conference Object
Processing of semi-solid materials using a shear-thickening Bingham fluid model
Ahmed, Alauddin; Alexandrou, Andreas N. (Publ by ASME, 1994)Recently the importance of processing metals and metal matrix composites in semi-solid state is growing rapidly. Performing the shape making operations in the semi-solid state provides a better opportunity to control the ...
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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 ...
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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 ...
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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 ...
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Conference Object
Sedimentation of heavy crystal particles under microgravity conditions
Alexandrou, Andreas N.; Gatsonis, N. A.; Shi, H.; Sacco, A. (American Institute of Aeronautics and Astronautics Inc, AIAA, 1998)Crystals grown from specially prepared liquid solutions have important industrial applications such as in biochemical processes, refining etc. The efficiency of these crystals is usually a function of their size. Therefore, ...
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Article
Semi-solid metal processing: “unlimited” flow velocity without turbulence in thin cast sections
Jorstad, J. L.; Alexandrou, Andreas N.; Mitsoulis, E. (2014)The objective of this presentation is to show and explain why semisolid slurries can fill thin sections at seemingly unlimited flow velocity