Lecturer

Phone: [+30] 2610 969435, Fax: [+30] 2610 997 371
e-mail : perrakis@mech.upatras.gr

He has graduated in the Mechanical Engineering Department of the University of Patras (Diploma 1980, Doctorate 1991). He was first employed as a Scientific Associate of the Department in 1980 and since 1992 he is Lecturer. He is responsible for teaching topics in the fields of Thermodynamics, Rocket propulsion and Turbulence. His research interests lie in the field of turbulent flows, large scale vortical structures and combustion with experimental and computational techniques, and applications in energy, environment, and aeronautics. He is involved in Research Projects in collaboration with Greek and foreign institutions of the public and the private sector. He has published several papers in scientific journals and international conference proceedings.

Research and Academic Activity

His research interests lie in the field of turbulence, and combustion with experimental and computational techniques, and applications in energy, environment, and aeronautics.

Titles indicative of the research topics he is working on are:

• Turbulent flow structures – Combustion: Vortical large scale structures, free turbulent flows (jets, wakes, mixing layer). Combustion schemes (oxy-fuel, staged combustion, etc) for industrial furnaces as related to combustion efficiency and reduction of emissions (especially NOx).

• Experimental techniques: Particle Image Velocimetry (PIV), Hot Wire Anemometry, Temperature measurements systems.

Teaching assignments: Technical Thermodynamics I, Technical Thermodynamics II, Aerospace propulsion systems, Rocket propulsion, Thermal Energy in Power Production (post graduate course, with D. Georgiou & E. Georgiou)

A brief outline of selected research topics is given in the following

Turbulent Flow Structures – Combustion

Significant part of his contribution in this field is related to the experimental investigation of Turbulent Vortex Rings generation and evolution using optical techniques and modeling of the related entrainment process.

Combustion schemes (oxy-fuel, staged combustion, etc) for industrial furnaces as related to combustion efficiency and reduction of emissions (especially NOx) have been investigated with experimental and numerical tools, in the frame of several European and National research projects, in collaboration with other partners (RGI, VIGLIETTI, LITOSF, MASTER, CEREMHER, YIOULA SA).

He has prepared several handout notes to support his teaching. He is supervising 5-8 diploma theses per year.

Selected Publications

Alnahhal, M., Cavo, A., Romeos, A., Perrakis, K., Panidis, Th., 2010 (submitted), The effect of endplates and sidewalls on rectangular jets, Eur. J. Mech. B Fluids

Cavo A., Giannadakis A., Perrakis K., Panidis, Th., 2010, Experimental Investigation of the Structural Development in the Near Field of a Rectangular Turbulent Jet using DPIV and HWA, EFMC8 – 8th Euromech Fluid Mechanics Conference

Alnahhal M., Perrakis K., Panidis, Th., 2010, The effect of endplates on the development of turbulent rectangular jets with and without sidewalls, ETMM8: 8th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements, pp. 627-632

Giannadakis A., Romeos A., Perrakis K., Panidis, Th., 2010, Mixing characteristics of a coaxial swirling jet: An experimental study, ETMM8: 8th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements, pp. 98-103

Giannadakis A., Perrakis K., Panidis Th. (2008) “A swirling jet under the influence of a coaxial flow”, Experimental Thermal and Fluid Science 32(8): 1548-1563.

Giannadakis A., Perrakis K., Romeos A., Panidis, Th., 2007, Characteristics of recirculating swirl flows, Proceedings of the Third European Combustion Meeting, pp.1-6

Giannadakis, D. Mavrilas, E. Apostolakis, K. Perrakis, “An approach to study the flow field in a model of sequential stenosed human arteries” Fifth World Congress of Biomechanics – Munich 2006- Journal of Biomechanics, Volume 39, Supplement 1, 2006, Page S617

Giannadakis A., K. Perrakis, E. Apostolakis, D. Mavrilas, 2006, Experimental and numerical investigation of the flow field in a model of human arteries (the double stenosis case), AERC 2006, 3rd Annual Rheology Conference

Vouros A., Panidis, Th., Papailiou D.D., Perrakis. K.K., 2005, The Structure of the Free Convection Thermal Field and the Interaction with a Fine Spray, 5th International Symposium on Multiphase Flow, Heat Mass Transfer and Energy Conversion, ISMF’05, pp. 1-9

Giannadakis, A., Romeos, A., Vouros, A., Perrakis, K. & Panidis, Th., 2004, Experimental Investigation of Confined Coaxial Swirl Flow, Joint Meeting of the Greek and Italian Sections of The Combustion Institute, P24, pp. 1-6

Yiannadakis A., Vouros A., Perrakis K., & Panidis Th., 2003, Confined Coaxial Swirl Flow, Third Meeting of Greek Section of the Combustion Institute, P4, pp. 1-8

Perrakis, K. K., and Papailiou, D.D., 2001, An experimental study of the translational velocity of Vortex Rings, First National Conference on Recent Advances in Mechanical Engineering, ASME – GREEK SECTION September 17-20, 2001, Patras, Greece.
Panidis, Th., Perrakis, K.K., Vouros, A., Koutmos, P., Orfanos, S. and Papailiou, D.D., 2001, Computational investigation of combustion schemes for glass furnaces, First National Conference on Recent Advances in Mechanical Engineering, ASME International, Greek Section, Patras, Paper ANG1/P130, pp. 1-6.

Th. Panidis, K. K. Perrakis, P. Koutmos, S. Orfanos and D. D. Papailiou, 2000, Conventional And Oxy Fuel Combustion In A Glass Furnace Installation” Proceedings of the First Balkan Conference on Glass Science and Technology, (Eds. Kordas, G. & Vlachos, N.S.), pp. 389-395.

Th. Panidis, K. K. Perrakis, P. Koutmos, S. Orfanos and D. D. Papailiou,1999, A Computational and Experimental Study of an Industrial Glass Furnace Installation”, 2nd Meeting of the Combustion Institute (Greek Section)

Perrakis, K.K, Panidis, Th., Orfanos, S., Papailiou, D.D., 1997, Emission Control Using Oxy-Fuel Burners in High Energy Consuming Combustion Systems, 1st Meeting of the Greek Section of the Combustion Institute, Athens

Perrakis, K.K. and Papailiou, D.D., An Exrerimental Study of Turbulent Vortex Rings, “Dynamics and Geometry of Vortical Structures”, EUROMECH 305 and ERCOFTAC Workshop, University of Roma.

Perrakis, K. K., and Papailiou, D.D., 1988, Turbulent Vortex Ring and Entrainment Mechanism, Progress in Astronautics and Aeronautics, AIAA, Vol. 112, pp. 105-115.
Perrakis, K. K., and Papailiou, D.D., 1987, The Turbulent Vortex Ring and the Entrainment Mechanism, The fifth International Beer Sheva Seminar on MHD Flows and Turbulence, March 2-6.