Institute of Mechanics

Position: Professor

Department: Fluid Mechanics

Room number: 327

Phone: +359 2 979 6457

E-mail: stradev@imbm.bas.bg

Scientific degrees, institution, year:

PhD, Sankt Petersburg University, 1972;

Dr.Sc., Institute of Mechanics, 1987

Mathematician, 1966-1968

Research Fellow, 1972-1978

Senior Research Fellow, 1978-1987

Professor, 1988-

Fields of Research:

- Fluid Mechanics

- Theory of Hydrodynamic Stability

- Theory of Heat and Mass Transfer

- Rarefied Gas Dynamics

- Applied Mathematics

Recent Publications:

1. A. Mongruel, V. Daru, S. Tabakova , A. Stoilova, F. Feuillebois, S. Radev, Impact de gouttes sur une surface solide et seche: Etude aux temps courts (in French), in “Proc. of 18-eme Congres Francais de Mecanique, August 27-31, ,Grenoble, France”, CFM 2007-0461, pp. 0461-0466 (2007).

2. S. Tabakova , S. Radev, F. Feuillebois, V. Daru, A. Stoilova, Numerical Modeling the Lateral Jet Dynamics at Viscous Drop Impinging on a Dry Surface, in “Proc. of the Third Int. Conf. on Computational Methods in Applied Mathematics (CMAM), June 23-30, Minsk, Belarus”, CMAM-3, pp. 142-153 (2007)

3. S. Tabakova , F. Feuillebois, S. Radev, A. Mongruel, Initial Stages of Viscous Drop Impact on Solid Surface, in “Proc. of 33rd Int. Conf. on Applications of Mathematics in Engineering and Economics, June 8-14, 2007, Sozopol, Bulgaria”, as AIP Conference Proceedings, vol. 946 pp. 135-142 (2007)

4. St. RADEV, F. Onofri, L. Tadrist, Sinuous Instability of a Viscous Capillary Jet into an Immiscible Non-Viscous Fluid. PART II: Different Forms and Numerical Analysis of the Dispersion Equation, J. Theor. Appl. Mech., BAS, vol. 37, No 2 (2007) pp.15-32.

5. St. RADEV, L. Tadrist, F. Onofri, Sinuous Instability of a Viscous Capillary Jet into an Immiscible Non-Viscous Fluid. PART I: 3D-equation of motion of a slender jet in the moving trihedron of the jet axis, J. Theor. Appl. Mech., BAS, vol. 37, No 1, pp. 23-38 (2007).

6. Stoilova, A., V. Daru, S. Tabakova , F. Feuillebois, S. Radev, Numerical Modeling the Impact of a Viscous Drop on a Dry Surface, in “Proc. of Fourth Int. Conf. on Finite Difference Methods: Theory and Applications'06, August 26-29, 2006, Lozenetz ,Bulgaria”, Rousse, pp. 301-306 (2007).

7. Ast. Liolios, K. Iossifidou, K. Liolios, Kh. Abdalla, S. RADEV, Numerical Approach to the Dynamic Unilateral Contact Problem of Soil-Pile Interaction under Instabilizing and Environmental Effects, in “Proceedings of the 6th Int. Conf. on Numerical Methods and Applications, August 20-24, 2006, Borovets, Bulgaria,”, as “Lecture Notes in Computer Science“, Springer, vol. 4310, pp. 646-651 (2007).

8. St. Radev, K. Nachev, F. Onofri, L.Tadrist, A. Liolios, Numerical Analysis of the Sinuous Instability of a Viscous Capillary Jet Flowing Down an Immiscible Nonviscous Fluid, in Proc. of the 6^th Int. Conf. on Numerical Methods and Applications, August 20-24, 2006, Borovets, Sofia, Bulgaria, as “Lecture Notes in Computer Science” Springer, vol. 4310, pp.677-684 (2007).

9. F. Onofri, A. Lenoble, St. RADEV, P-H Guering, High resolution monitoring of unsteady glass fibre drawing process, Exp. Fluids, vol. 42, pp. 601-610 (2007).

10. S. Tabakova, F. Feuillebois, S. Radev, Modeling the Lateral Jet Following the Drop Impact on a Dry Wall, in “Proc. of 20th Anniversary of the Plovdiv Branch of Technical University (TU) - Sofia, Plovdiv, Bulgaria, Nov. 9-11, 2006” as a Journal of TU at Plovdiv, vol. 13, No.10, pp. 43-49 (2006).

11. St. RADEV, M. Kaschiev, F. Onofri, L. Tadrist, Numerical Study of the Nonlinear Instability of a Compound Capillary Jet Including the Effect of the Discontinuity of the Undisturbed Axial Velocity, CD-Proceedings of the 16th International Conference on Computer Theory and Applications (ICTEA), 5 - 7 September 2006, Sheraton Hotel, Alexandria, Egypt, Arab Academy for Science, Technology and Maritime Transport, pp. 226-229 (2006).

12. Ast. Liolios, V. Profillidis, Kh. Abdalla, S. Tsotos, K. Pitilakis, S. RADEV, T. Angelov, D. Ruzic, A Convex Numerical Approach to the Unilateral Contact Dynamic Problem of Soil-Pile Interaction under Second Order geometric Effect, in “Proc. of the II Int. Conf. on Nonsmouth Nonconvex Mechanics with Applications in Engineering, July 7-8, 2006, Thessaloniki, Greece”, Aristotle Univ. of Thessaloniki, pp. 333-338 (2006).

13. S.P. RADEV, M. Chacha, Bending instability of a slender non-viscous jet induced by a concentric layer, Proceedings of the ICTEA-06, Al Ain-UAE, 3-6 January 2006, pp. 506-510 (2006).

14. F. Feuillebois, S. RADEV, A. Stoilova, S. Tabakova, Modeling the Impact and Spreading of a Drop on a Dry Surface, Journal of Theoretical and Applied Mechanics, BAS, vol. 35, No. 3, pp. 39-60 (2005).

15. F. Onofri, Paul-Henri, Guering, St. RADEV, Light scattering properties and high-resolution diffractometry of homogeneous and non-homogeneous fibres, in “Proc.of the 7^th Int. Con. On Optical Particle Characterization”, Kyoto, 1-5 August 2004, paper 0-13-2, pp. 0-13-2:1-6 (2004).

16. F. Onofri, St. RADEV, 3-Coherent Beams Phase Doppler and Laser Doppler Velocimetry Measurement Techniques, in “Proc. of 12^th Int. Symp. on Appl. of Laser Tech. to Fluid Mech.”, Lisbon (Portugal), July 2004, paper 25.5, pp. 25.5.1-25.5.13.

17. F. Onofri, A. Lenoble, St. RADEV, P.H. Guering, Optical Measurement of the Drawing Tension of Small Glass Fibres, Meas. Sci. Technol., vol. 15 pp. 1279-1284 (2004).

18. F. Onofri, A. Lenoble, St. RADEV, H. Bultynck, P.H. Guering, N. Marsault, Interferometric Sizing of Single-Axis Birefringent Glass Fibres, Part. and Part. Syst. Charact.,vol. 20, No. 3, pp.1-12 (2003).

19. Ast. Liolios, Ang. Liolios, St. RADEV, T. Angelov, A Numerical Approach for a Hemivariational Inequality Concerning the Dynamic Interaction Between Adjacent Elastic Bodies, in "Proc. of the 5^th Int. Conf. on Numerical Methods and Applications", August 20-24, 2002, Borovets, Sofia, Bulgaria, as “Lecture Notes in Computer Science”, Springer, vol. 2542, pp. 519-526 (2003).

20. F. Onofri, A. Lenoble, St. RADEV, Superimposed Non-Interfering Probes to Extend the Phase Doppler Anemometry Capabilities, Applied Optics, vol. 41, No 18, pp. 3590-3600 (2002).

21. F. Onofri, A. Lenoble, St. RADEV, H. Bultynck, Controle temps reel du diametre de fibres de verre en cours de production, in “Recueil des actes de 3-me Colloque Francophone “ Methodes et Techniques optiques pour l’Industrie”, 18-22 Nov. 2002, St. Aubin de Medoc”, Club de la Societe Francaise d`Optique “Controle et Mesures Optiques por l`Industrie”, vol. 1, pp. 63-68 (2002).

22. F. Onofri, A. Lenoble, St. RADEV, Modélisation physique du procédé des fibrage des fibres de renforcement, in “Recueil des actes de Congrés Francais de Thermique”, 3-6 juin 2002, Vittel, France, SFT, pp. 139-144 (2002).

23. St. RADEV, M. Kaschiev, M. Koleva, L. Tadrist, F. Onofri, The Effect of the Velocity Profile Discontinuity on the Instability of a Compound Capillary Jet, in “Proc. of the IX Nat. Congress of Theor. and Appl. Mech.”, September 19-24, Varna, Bulgaria, Publ. House of Bulg. Acad. Sci., Sofia, vol. 2, pp. 65-69 (2001).

24. St. RADEV, M. Koleva, M. Kaschiev, L. Tadrist, F. Onofri, Numerical Analysis of the Instability of a Compound Capillary Jet, in "Proc. of the Second Conference on Numerical Analysis and Applications", June 11-15,2000, Rousse, Bulgaria, as “Lecture Notes in Computer Science“, vol. 1988, pp. 692-701 (2001).

25. F. Onofri, A. Lenoble, St. RADEV, Superimposed Non Interfering Probes to Extend the Phase Doppler Anemometry Size Range, in “Proc. of the 10th Int. Symp. on Applications of Laser Techniques to Fluid Mechanics, 10-13 July, 2000, Lisbon, Portugal”, Calouste Gulbenkian Foundation, CD-ROM, paper 20.1, pp. 20.1.1-20.1.12 (2000).

26. F. Onofri., A. Lennoble, S. RADEV, Interferometrie phase doppler a sondes optiques monohromatiques non-coherent entre elles, in “Recueil des actes de 7ème Congrès Francophonie de Vélocimétrie Laser, 19-22 Septembre, 2000, IRPHE-IUSTI-CEA, Marseille, pp. 59-66 (2000).

27. A. M'chirgui, L. Tadrist, St. RADEV, Intermittent Transition to a Turbulence in a Self-Excited Gas-Solid Fluidized Bed, in. “Proc. of Minsk Int. Forum on Heat/Mass Transfer -2000, Minsk, Belarus, 2000, vol. 6, pp. 95-104 (2000).

Institute of Mechanics tel.: +359 2 973 31 40; e-mail: office@imbm.bas.bg