Browsing Τμήμα Μηχανικών Μηχανολογίας και Κατασκευαστικής / Department of Mechanical and Manufacturing Engineering by Title
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Article
On bubble rising in a HeleShaw cell filled with a nonNewtonian fluid
(2004)The problem of a bubble rising due to buoyancy in a HeleShaw cell filled with a viscous fluid is a classical freeboundary problem first posed and solved by Saffman & Taylor. In fact, due to linearity of the flow equations ...

Article
On the analogy between streamlined magnetic and solid obstacles
(2009)Analogies are elaborated in the qualitative description of two systems: the magnetohydrodynamic (MHD) flow moving through a region where an external local magnetic field (magnetic obstacle) is applied and the ordinary ...

Article

Article
On the determination of yield surfaces in HerschelBulkley fluids
(1999)HerschelBulkley fluids are materials that behave as rigid solids when the local stress τ is lower than a finite yield stress τ0, and flow as nonlinearly viscous fluids for τ > τ0. The flow domain then is characterized by ...

Article
On the early breakdown of semisolid suspensions
(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 timedependent material properties. During processing, ...

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On the linear stability of turbulent plane strain flow in a rotating frame
(2007)We apply inviscid rapid distortion theory to the limiting hyperbolic case of turbulent plain strain flow in a rotating frame and investigate the dependence of the evolution of the turbulent kinetic energy on the frame ...

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On the modeling of semisolid suspensions
(2008)Due to the distinct rheology of semisolid slurries the process has well established advantages over competing nearnetshape manufacturing technologies. Despite the obvious advantages of the process its adoption by the ...

Conference Object
On the optical properties of thermoelectric alkali metal chalcogenide compounds
(Affiliation: Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceAffiliation: Department of Chemistry, Michigan State University, East Lansing, MI 48824, United StatesAffiliation: Department of Mechanical and Manufacturing Engineering, University of Cyprus, 1678 Nicosia, CyprusCorrespondence Address: Hatzikraniotis, E.Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece, 2006)Solid solutions of K2Bi8xSbxSe 13 is an interesting series of complex bismuthchalcogenide compounds, which are attractive for thermoelectric investigations. The highly anisotropic structure in these compounds results in ...

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On the potential use of quarry waste material for CO2 sequestration
(2016)The use of solid wastes rich in Ca2+, Mg2+ and Fe2+ for the ex situ sequestration of CO2 could provide an economically and technologically viable option for the reduction of anthropogenic CO2 emissions. Here, we investigate ...

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On the potential use of quarry waste material for CO2 sequestration
(2016)•Novel nanomaterials were produced via ball milling (BM) of quarry waste material.•Various morphological and structural modifications occurred after the BM process.•The optimum conditions are 20h of BM with 50wt% ethanol ...

Article
On the steadystate advancement of fingers and bubbles in a HeleShaw cell filled by a nonNewtonian fluid
(1997)The problem of steadystate propagation of a finger or a bubble of inviscid fluid through a HeleShaw cell filled by a viscous nonNewtonian, including viscoplastic (Bingham) fluid is addressed. Only flows symmetric ...

Article
On the transition to turbulence of a viscoplastic fluid past a confined cylinder: A numerical study
(2015)Threedimensional direct numerical simulations of a Bingham fluid flowing past a confined circular cylinder have been used in order to investigate viscoplastic effects in the waketransition regime. The case of a cylinder ...

Article
On the use of the BLYP functional for the DFT calculation of graphitehydrogen systems
(2010)This letter focuses on a possible pitfall that can occur in the DFT calculation of graphitehydrogen interactions under tokamaks conditions. Calculations based on the BLYP functional, in fact, result in a stable C2H3 group ...

Conference Object
On the use of thermoelectric (TE) applications based on commercial modules: The case of TE generator and TE cooler
(Department of Physics, Aristotle University of Thessaloniki, GreeceDepartment of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia, CyprusCorrespondence Address: Zorbas, K.Department of Physics, Aristotle University of ThessalonikiGreece, 2010)In recent years, thermoelectricity sees rapidly increasing usages in applications like portable refrigerators, beverage coolers, electronic component coolers etc. when used as Thermoelectric Cooler (TEC), and Thermoelectric ...

Article
Onepoint modelling of rapidly deformed homogeneous turbulence
(1995)Turbulent stresses introduced by Osborne Reynolds do not, by themselves, provide an adequate tensorial base for onepoint modelling of rapidly distorted turbulence because they do not carry critical information about the ...

Article
Onepoint turbulence structure tensors
(2001)The dynamics of the evolution of turbulence statistics depend on the structure of the turbulence. For example, wavenumber anisotropy in homogeneous turbulence is known to affect both the interaction between large and small ...

Article
Optical and electrical properties of selectively deltadoped strained InxGa1xAs/GaAs quantum wells
(1996)We report here an investigation of selectively deltadoped strained InGaAs/GaAs quantum wells. Electronic structures of the systems were calculated by selfconsistently solving the Schrödinger and Poisson equations and the ...

Article
Optical probing of anisotropic heat transport in the quantum spin ladder Ca 9La 5Cu 24O 41
(2012)A transient thermal imaging technique is used to monitor heat diffusion at the surface of the antiferromagnetic spin ladder material Ca 9La 5Cu 24O 41. This material shows highly anisotropic thermal conductivity due to a ...

Article
Optical studies of the a, b, and caxis charge dynamics in YBa2Cu3O6+x
(1993)Optical and Ramanscattering studies of a, b, and caxis YBa2Cu3O6+x between 0.025 and 5.5 eV are presented as a function of doping, and compared to the results of Bi2Sr2CaCu2O8 and La2xSrxCuO4. Our dopingdependence ...

Conference Object
Optimization of fully observable nonlinear stochastic uncertain controlled diffusion: Monotonicity properties and optimal sensitivity
(Affiliation: Sch. of Info. Technol. and Eng., University of Ottawa, 800 King Edward Ave., Ottawa, Ont. K1N 6N5, CanadaAffiliation: Sch. of Info. Technol. and Eng., University of Ottawa, 161 Louis Pasteur, A519, Ottawa, Ont. K1N 6N5, CanadaAffiliation: Electrical Engineering Department, University of Cyprus, 75 Kallipoleos Avenue, Nicosia, CyprusAffiliation: Mechanical Engineering Department, University of Cyprus, 75 Kallipoleos Avenue, Nicosia, CyprusCorrespondence Address: Rezaei, F.Sch. of Info. Technol. and Eng., University of Ottawa, 800 King Edward Ave., Ottawa, Ont. K1N 6N5, Canadaemail: frezaei@site.uottawa.ca, 2004)This paper is concerned with fully observable nonlinear stochastically controlled diffusions, in which uncertainty is described by a relative entropy constraint between the nominal measure and the uncertain measure, while ...