Browsing Τμήμα Μηχανικών Μηχανολογίας και Κατασκευαστικής / Department of Mechanical and Manufacturing Engineering by Author "Alexandrou, Andreas N."
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Conference Object
3D flow of HerschelBulkley fluids
Burgos, Gilmer R.; Alexandrou, Andreas N. (ASME, 1998)The flow of HerschelBulkley fluids through a sudden 3D 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. ...

Article
An analysis of laminar fluid flow in porous tube and shell systems
Pangrle, B. J.; Alexandrou, Andreas N.; Dixon, A. G.; Dibiasio, D. (1991)The finite element method was used to study steady, incompressible, laminar flow in porous tube systems. The NavierStokes equations were used to describe the flow phenomena in the tube and shell space while the continuum ...

Article
Breakup of a capillary bridge of suspensions
Alexandrou, Andreas N.; Bazilevskii, A. V.; Entov, V. M.; Rozhkov, A. N.; Sharaf, A. (2010)The breakup of liquid bridges under the action of capillary forces is used for studying the rheology of suspensions under stretching. The experiments were performed with suspensions of finegrained (330 μm) sand in glycerin ...

Article
Cessation of the liddriven cavity flow of Newtonian and Bingham fluids
Syrakos, A.; Georgiou, G. C.; Alexandrou, Andreas N. (2016)We provide benchmark results for a transient variant of the liddriven cavity problem, where the lid motion is suddenly stopped and the flow is left to decay under the action of viscosity. Results include Newtonian as well ...

Conference Object
Compression molding of semiconcentrated fiber suspensions: Flow and fiber orientation
Ahmed, Alauddin; Alexandrou, Andreas N. (Publ by ASME, 1993)The focus of this paper is compression molding of semiconcentrated fiber suspensions. During compression molding a premeasured amount of raw material (charge) is placed between two halves of a die. The die is then closed ...

Article
Compression molding using a generalized eulerian–lagrangian formulation with automatic remeshing
Ahmed, A.; Alexandrou, Andreas N. (1992)A generalized Eulerian‐Lagrangian approach is used to study the compression molding of viscoelastic polymers. The complete, unsteady, two‐dimensional equations of motion are used in the analysis. The White–Metzner model ...

Article
Correction: Arsalis A.
Arsalis, A.; Alexandrou, Andreas N.; Georghiou, George E. (2017)

Article
Design and modeling of 110 MWe liquefied natural gasfueled combined cooling, heating and power plants for building applications
Arsalis, A.; Alexandrou, Andreas N. (2015)Decentralized, liquefied natural gasfueled, trigeneration plants are considered as alternatives to centralized, electricityonly generating power plants to improve efficiency and minimize running costs. The proposed system ...

Article
Determination of the rheological parameters of selfcompacting concrete matrix using slump flow test
Neophytou, Marina K. A.; Pourgouri, Stella; Kanellopoulos, Antonios; Petrou, Michael F.; Ioannou, Ioannis; Georgiou, Georgios; Alexandrou, Andreas N. (2010)

Article
Determination of the rheological parameters of selfcompacting concrete matrix using slump flow test
Neophytou, Marina K. A.; Pourgouri, S.; Kanellopoulos, A. D.; Petrou, Michael F.; Ioannou, I.; Georgiou, G.; Alexandrou, Andreas N. (2010)The classification of a concrete mixture as selfcompacting (SCC) is performed by a series of empirical characterization tests that have been designed to assess not only the flowability of the mixture but also its segregation ...

Article
Determining true material constants of semisolid slurries from rotational rheometer data
Alexandrou, Andreas N.; Georgiou, G. C.; Economides, E. A.; Modigell, M. (2016)In this work we revisit the issue of obtaining true material constants for semisolid slurries. Therefore, we consider the circular Couette flow of HerschelBulkley fluids. We first show how true constants can be obtained ...

Book Chapter
Effective utilization of liquefied natural gas for distributed generation
Arsalis, A.; Alexandrou, Andreas N. (Nova Science Publishers, Inc., 2015)Liquefied natural gas (LNG) is considered a safe and transportable fuel and could become a fueling option for distributed generation applications, particularly in locations which are situated far from centralized power ...

Conference Object
Effects of periodic gravity modulation in microgravity convection systems
Cyr, Martha N.; Alexandrou, Andreas N.; Olinger, D. J. (Publ by ASME, 1993)Natural convection in an enclosure that is subjected to periodic excitations is investigated using a classical mixed Galerkin finite element method. The modulation is incorporated in the momentum equations, through a ...

Article
Firstpassage study and stationary response analysis of a BWB hysteresis model using quasiconservative stochastic averaging method
Noori, M.; Dimentberg, M.; Hou, Z.; Christodoulidou, R.; Alexandrou, Andreas N. (1995)The quasiconservative stochastic averaging (QCSA) method is applied to a BoucWenBaber hysteretic system (BWB) under Gaussian white noise excitations. The stationary probability density of the system's response amplitude ...

Article
Flow development in compression of a finite amount of a Bingham plastic
Florides, G. C.; Alexandrou, Andreas N.; Georgiou, G. C. (2007)The flow and shape evolution during the compression of a finite amount of a Bingham plastic is investigated by means of numerical simulations. The problem relates to the popular compression test used for the rheological ...

Article
Flow development of HerschelBulkley fluids in a sudden threedimensional square expansion
Burgos, G. R.; Alexandrou, Andreas N. (1999)The flow development of HerschelBulkley fluids in a sudden threedimensional square expansion is studied numerically. The flow is modeled using the mixedGalerkin finite element formulation to solve the conservation of ...

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

Article
Inertial, viscous and yield stress effects in Bingham fluid filling of a 2D cavity
Alexandrou, Andreas N.; Duc, E.; Entov, V. (2001)The present study concentrates on Bingham fluid filling of a 2D cavity and examines the relative importance of inertial, viscous and yield stress effects on the filling profile. The results presented are obtained using ...

Conference Object
Injection molding of dilute and semidilute fiber suspensions
Alexandrou, Andreas N.; Ahmed, Alauddin (Publ by ASME, 1992)The focus of this paper is unsteady flow of semidilute fiber suspensions in complex geometries. These flows are typical of injection molding problems in which the raw material in granular form, usually plastic resin mixed ...

Article
Injection molding using a generalized eulerian lagrangian formulation
Alexandrou, Andreas N.; Armed, A. (1993)A mathematical and a numerical approach to model the injection mold filling stage is presented. The approach is based on a Generalized Eulerian Lagrangian (GEL) formulation. In purely Lagrangian formulations the solution ...