Browsing by Author "Bontozoglou, V."
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Experiments on laminar film flow along a periodic wall
Vlachogiannis, M.; Bontozoglou, V. (2002)Experimental results are reported on the structure of gravitydriven film flow along an inclined periodic wall with rectangular corrugations. A fluorescence imaging method is used to capture the evolution of film height ... 
Extreme solitary waves on falling liquid films
Chakraborty, S.; Nguyen, P. K.; RuyerQuil, C.; Bontozoglou, V. (2014)Direct numerical simulation (DNS) of liquid film flow is used to compute fully developed solitary waves and to compare their characteristics with the predictions of lowdimensional models. Emphasis is placed on the regime ... 
Falling film flow along steep twodimensional topography: The effect of inertia
Bontozoglou, V.; Serifi, K. (2008)Steady film flow along a vertical wall with isolated step changes is studied numerically for Reynolds numbers Re similar to O(10(3)10(2)) and capillary numbers Ca similar to O(10(2)10(1)). The lengthscale of free surface ... 
Hydrogen absorption into aluminum alloy 2024T3 during exfoliation and alternate immersion testing
Haidemenopoulos, G. N.; Hassiotis, N.; Papapolymerou, G.; Bontozoglou, V. (1998)Exfoliation and alternate immersion corrosion were investigated in Al alloy 2024T3 (UNS A92024) uptake during exposure and to correlate it with corrosion characterization. Characterization involved determination of weight ... 
Hydrogen trapping: Deformation and heat treatment effects in 2024 alloy
Kamoutsi, H.; Haidemenopoulos, G. N.; Bontozoglou, V.; Petroyiannis, P. V.; Pantelakis, Sp G. (2006) 
INFRARED HEATING OF GREENHOUSES REVISITED: AN EXPERIMENTAL AND MODELING STUDY
Kavga, A.; Panidis, T.; Bontozoglou, V.; Pantelakis, S. (2009)The potential advantages of nighttime heating of greenhouses by modern infrared (IR) radiative sources, instead of forced hot air, are examined experimentally and theoretically. Measurements of indoor and outdoor conditions ... 
Investigation of the potential of long wave radiation heating to reduce energy consumption for greenhouse heating
Kavga, A.; Pantelakis, S.; Panidis, Th; Bontozoglou, V. (2008)A parametric study has been carried out to quantify the contribution of each of the components of a greenhouse to the energy consumption during heating. The greenhouse, located in Western Greece, is heated by water pipes. ... 
AN INVISCID INVESTIGATION OF THE INITIATION OF ROLL WAVES IN HORIZONTAL GASLIQUID FLOWS
Breyiannis, G.; Valougeorgis, D.; Bontozoglou, V.; Goulas, A. (1994)A model with constant vorticity in the liquid phase has been applied to the study of interfacial waves between two inviscid fluids in relative motion, in order to take into account the shear induced into the liquid by the ... 
Laminar film flow along a periodic wall
Bontozoglou, V. (2000)Laminar, gravitydriven flow of a liquid down an inclined wall with largeamplitude sinusoidal corrugations is studied numerically by a spectral spatial discretization method. The synchronous resonance between the wall and ... 
Laminar film flow down a wavy incline
Bontozoglou, V.; Papapolymerou, G. (1997)Laminar how of a liquid, down an inclined wall with sinusoidal corrugations, is considered. A linear analysis, valid for smallamplitude disturbances but arbitrary wavelength and Re number, leads to an OrrSommerfeld type ... 
LARGEAMPLITUDE INTERFACIAL WAVES ON A LINEAR SHEARFLOW IN THE PRESENCE OF A CURRENT
Breyiannis, G.; Bontozoglou, V.; Valougeorgis, D.; Goulas, A. (1993)The properties of twodimensional steady periodic interfacial gravity waves between two fluids in relative motion and of constant vorticities and finite depths are investigated analytically and numerically. Particular ... 
Lateral motion and interaction of gas bubbles growing over spherical and plate heaters
Divinis, N.; Karapantsios, T. D.; De Bruijn, R.; Kostoglou, M.; Bontozoglou, V.; Legros, J. C. (2006)This work investigates the motion of CO2 bubbles emerging in nheptane when a heat pulse given to a submerged heater creates local supersaturation. The ensuing slow diffusioninduced bubble expansion makes bubble motion ... 
Linear resonance in viscous films on inclined wavy planes
Wierschem, A.; Bontozoglou, V.; Heining, C.; Uecker, H.; Aksel, N. (2008)We study viscous gravitydriven films flowing over periodically undulated substrates. Linear analysis describes steady flow along small amplitude corrugations for films of arbitrary thickness. Solving the resulting system ... 
Mass transfer in gasliquid flow in smalldiameter tubes
Tortopidis, P.; Bontozoglou, V. (1997)Data on the rate of liquidphase controlled mass transfer in a smalldiameter tube (ID 4 mm) are presented. The motivation is to model the performance of compact contact devices consisting of short, narrow passages. The ... 
Measurements of liquid film flow as a function of fluid properties and channel width: Evidence for surfacetensioninduced longrange transverse coherence
Georgantaki, A.; Vatteville, J.; Vlachogiannis, M.; Bontozoglou, V. (2011)We study experimentally the influence of the transverse dimension on film flow in relatively wide channels with sidewalls. Large deviations from twodimensional predictions are observed in the primary instability and in ... 
Nominally twodimensional waves in inclined film flow in channels of finite width
Leontidis, V.; Vatteville, J.; Vlachogiannis, M.; Andritsos, N.; Bontozoglou, V. (2010)Traveling waves in inclined film flow in channels of finite width are never truly twodimensional (2D) because of a longrange effect of sidewalls The present study documents the characteristics of the first waves that are ... 
Nonlinear dynamics of a viscoelastic film subjected to a spatially periodic electric field
Karapetsas, G.; Bontozoglou, V. (2015)We investigate the nonlinear dynamics of the electrohydrodynamic instability of a viscoelastic polymeric film under a patterned mask. We develop a computational model and carry out 2D numerical simulations fully accounting ... 
Nonlinear dynamics of inclined films under lowfrequency forcing
Argyriadi, K.; Serifi, K.; Bontozoglou, V. (2004)The evolution of an inclined liquid film, subjected to regular inlet disturbances of small frequency, f, is studied experimentally and computationally. The fluorescence imaging method is used to quantitatively document ... 
Nonlinear resonance in viscous films on inclined wavy planes
Heining, C.; Bontozoglou, V.; Aksel, N.; Wierschem, A. (2009)We study nonlinear resonance in viscous gravitydriven films flowing over undulated substrates. Numerical solution of the full, steady NavierStokes equations is used to follow the emergence of the first few freesurface ... 
Nucleation, growth and detachment of neighboring bubbles over miniature heaters
Karapantsios, T. D.; Kostoglou, M.; Divinis, N.; Bontozoglou, V. (2008)This work investigates how simultaneous CO2 bubbles desorb from water and nheptane when these liquids become supersaturated with dissolved CO2. Supersaturation is imposed locally by a miniature heater so bubbles grow at ...