Listar por autor "Andritsos, N."
Mostrando ítems 1-13 de 13
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Adapting the use of Fe3O4 nanoparticles in large-scale water treatment facilities
Simeonidis, K.; Andritsos, N.; Kaprara, E.; Mourdikoudis, S.; Mitrakas, M. (2014)Magnetite nanoparticles were produced by the chemical co-precipitation of iron sulfates at alkaline conditions and were tested as a Cr(VI) adsorbent from water. Batch adsorption experiments showed a high removal efficiency, ... -
Calcium carbonate scaling in a plate heat exchanger in the presence of particles
Andritsos, N.; Karabelas, A. J. (2003)Scale formation of CaCO3 in a plate heat exchanger is investigated in the presence of various types of added particles under isothermal conditions. The parameters examined include the degree of supersaturation, the type ... -
Characteristics of low-enthalpy geothermal applications in Greece
Andritsos, N.; Dalabakis, P.; Karydakis, G.; Kolios, N.; Fytikas, M. (2011)The paper offers a brief overview of the current direct geothermal uses in Greece and discusses their characteristics, with emphasis to the economical and technical problems encountered. Greece holds a prominent place in ... -
Cu-Zn powders as potential Cr(VI) adsorbents for drinking water
Kaprara, E.; Seridou, P.; Tsiamili, V.; Mitrakas, M.; Vourlias, G.; Tsiaoussis, I.; Kaimakamis, G.; Pavlidou, E.; Andritsos, N.; Simeonidis, K. (2013)This work examines the possibility of applying CuZn alloys as a reducing medium for the efficient removal of hexavalent chromium from drinking water. In an effort to develop a route for producing powders of CuZn alloys ... -
Development of iron-based nanoparticles for Cr(VI) removal from drinking water
Simeonidis, K.; Tziomaki, M.; Angelakeris, M.; Martinez-Boubeta, C.; Balcells, L.; Monty, C.; Mitrakas, M.; Vourlias, G.; Andritsos, N. (2013)A great deal of research over recent decades has been motivated by the requirement to lower the concentration of chromium in drinking water. This study has been conducted to determine the feasibility of iron-based nanoparticles ... -
Effect of Fluid Properties on Flow Patterns in Two-Phase Gas Liquid Flow in Horizontal and Downward Pipes
Tzotzi, C.; Bontozoglou, V.; Andritsos, N.; Vlachogiannis, M. (2011)This paper investigates the effect of gas density and surface tension on flow pattern transitions in horizontal and near-horizontal pipes. Experiments were conducted at atmospheric conditions in a 12.75-m long pipe with a ... -
Interfacial shear stress in wavy stratified gas-liquid flow in horizontal pipes
Tzotzi, C.; Andritsos, N. (2013)The scope of this study was to improve the Andritsos-Hanratty model for estimating interfacial friction factor and pressure drop in horizontal stratified gas-liquid two-phase flow. New experimental results (focusing on the ... -
Method for selecting casing diameters in wells producing low-enthalpy geothermal waters containing dissolved carbon dioxide
Kelessidis, V. C.; Karydakis, G. I.; Andritsos, N. (2007)Most low-enthalpy geothermal waters contain dissolved gases (e.g., CO2, H2S, and CH4)- In artesian geothermal wells, the absolute pressure of the water flowing towards the surface may drop below the bubble point of the ... -
Modelling Tomato Dehydration in a Tunnel Dryer Using Geothermal Energy
Kostoglou, M.; Chrysafis, N.; Andritsos, N. (2013)Low-temperature geothermal waters can be used efficiently in drying various vegetables and fruits, replacing sun-drying or drying using conventional fuels. A geothermal tomato dehydration plant has been operating since ... -
Nominally two-dimensional 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 two-dimensional (2D) because of a long-range effect of sidewalls The present study documents the characteristics of the first waves that are ... -
Optimizing magnetic nanoparticles for drinking water technology: The case of Cr(VI)
Simeonidis, K.; Kaprara, E.; Samaras, T.; Angelakeris, M.; Pliatsikas, N.; Vourlias, G.; Mitrakas, M.; Andritsos, N. (2015)The potential of magnetite nanoparticles to be applied in drinking water treatment for the removal of hexavalent chromium is discussed. In this study, a method for their preparation which combines the use of low-cost iron ... -
Precipitation of calcium phosphate from simulated milk ultrafiltrate solutions
Spanos, N.; Patis, A.; Kanellopoulou, D.; Andritsos, N.; Koutsoukos, P. G. (2007)The present work deals with the influence of pH and temperature on the spontaneous precipitation of calcium phosphate from simulated milk ultrafiltrate (SMUF) solutions. The pH range investigated is 5.7-7.0, and the ... -
A study of CaCO3 scale formation and inhibition in RO and NF membrane processes
Tzotzi, C.; Pahiadaki, T.; Yiantsios, S. G.; Karabelas, A. J.; Andritsos, N. (2007)The formation of CaCO3 deposits on RO and NF membranes was investigated in connection with permeate flux decline. Experiments, in the presence and absence of scale inhibitors, were carried out in a cross-flow membrane test ...