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Slavtcho G. Slavtchev

Position: Assoc. Member

Department: Mathematical modeling and numerical simulations

Room number: 326

Phone: +359 2 979 64 56

E-mail: slavcho@imbm.bas.bg

Scientific degrees, institution, year:

 

 

PhD, St. Petersburg University, St. Petersburg,

Russia, 1970

Fields of Research:

 

Fluid mechanics,

Heat/mass transfer in fluids,

Stability of ferrofluids,

Marangoni convection,

Falling films,

Asymptotic and numerical methods in Fluid mechanics

 

 

Extended Information

Visits

 

June/July 1972 – Centre International des Sciences Mécaniques, Udine, Italy, specialization;

October 1978/May 1979 – Rochester Univ., Rochester, USA, sabbatical leave;

October /December 1987 –Institute of Mechanical Problems, Moscow, Russia, visiting professor;

March/July 1993 –Liege Univ., Liege, Belgium, grant of ЕU;

Sept 1994/August 1995 – Liege Univ., Liege, Belgium, visiting professor;

February/April 1996 – Liege Univ., Liege, Belgium, visiting professor;

June/July 1996 – Universite Libre de Bruxelles, Brussels, Belgium, visiting professor;

March/April 1997 – Liege Univ., Liege, Belgium, visiting professor;

May/June 2002 – Technical University, Berlin, Germany, visiting professor;

June/July 2003 – Technical University, Berlin, Germany, visiting professor;

October 2003 – Technical University, Berlin, Germany, lecturer, PhD course on“Transfer processes in falling films”;

September 2004 – Technical University, Berlin, Germany, visiting professor;

October 2005 – Technical University, Berlin, Germany, visiting professor;

September 2007 – Technical University, Berlin, Germany, visiting professor.

 

Recent and Selected Publications

 

  1. Rashevski M., Slavtchev S., Natural and mixed convection in a vertical water-flow chamber in the presence of solar radiation, Engineering Science and Technology, an International Journal, 101073, (2021)
  2. Rashevski M., Slavtchev S., Heat transfer in laminar viscous flow in a channel with one porous wall, European Journal of Mechanics-B/Fluids 82, 11-20, (2020)
  3. Hennenberg M., Slavtchev S., Valchev G., On Faraday instability in magnetric liquids: Ince-Erdelyi approach applied to the Hill equation describing oscillations of a ferrofluid free surface, J. Theor. Appl. Mech., vol. 43, No. 4, pp. 49-68 (2013)
  4. Slavtchev S., Kalitzova-Kurteva P., Oron A., Evolution Equation for Nonlinear Long-Wavelength Monotonic Marangoni Instability in a Binary Liquid Layer with Nonlinear Soret Effect, Journal of Theoretical and Applied Mechanics 43 (2), 95, (2013)
  5. Pesheva N., Stefanov I., Slavtchev S, Application of the invasion percolation model to water-gas flows in artificial soils with plants, Transport in Porous Media, vol. 83, Issue 2, pp. 319-331 (2010).
  6. Hennenberg M., Slavtchev S., Valchev G., On the Hill equation describing oscillations of a ferrofluid free surface in a vertical magnetic field, Microgravity Science and Technology, vol. 22, No. 3, pp. 455-460 (2010).
  7. Valchev G., Slavtchev S., Hennenberg M., Weyssow B., Instability of a thermoconvective ferrofluid flow in a horizontal channel, Proc. 7th Int. Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (HEFAT2020), 19-21 July 2010, Antalya, Turkey, pp. 617-621 (2010).
  8. Vanhaelen Q., Hennenberg M., Slavtchev S., Weyssow B., Contribution to the dynamics of a deformable interface between two incompressible electromagnetically controllable liquids, Physica A, Statistical Mechanics and its Applications, vol. 389, No. 21, pp. 5061-5076 (2010).
  9. Hennenberg M., Slavtchev S., Weyssow B., Oscillatory magnetic field action on a ferrofluid layer, J. Theor. Appl. Mech., vol. 40, No.1, pp. 33-50 (2010).
  10. Hennenberg M., Slavtchev S., Weyssow B., Thermal Marangoni instability and the magnetic pressure for a thin ferrofluid layer, In: Interdisciplinary Transport Phenomena: Annals New York Acad. Sciences, No. 1161, pp. 361-376 (2009).
  11. Hennenberg M., Slavtchev S., Weyssow B., Modelling of an oscillatory magnetic field action on a ferrofluid layer, Microgravity Science and Technology, vol. 21 (Suppl. 1), pp. S45-S50 (2009).
  12. Kalitzova-Kurteva P., Slavtchev S., Oron A., Long-wavelength oscillatory Marangoni instability in a binary mixture layer with nonlinear Soret effect, J. Theor. Appl. Mech., vol. 39, No. 3, pp. 63-78 (2009).
  13. Slavtchev S., Kalitzova-Kurteva P., Oron A., Long-wavelength monotonic Marangoni instability in a binary mixture layer with nonlinear Soret effect, J. Theor. Appl. Mech., vol. 39, No. 1, pp. 31-54 (2009).
  14. Slavtchev S., Hennenberg M., Valchev G., Weyssow B, Stability of ferrofluid flows in a horizontal channel subjected to a longitudinal temperature gradient and an oblique magnetic field, Microgravity Science and Technology, vol. 20, issue 3-4, pp. 199-203 (2008).
  15. Nikolov L., Mamatarkova V., Slavtchev S., Stoychev S., The convergence of biotechnology and nanotechnology as an accelerator of the development of biofilm technologies, Ecological Engineering and Environment Protection, Year 7, No. 1, pp. 36-47 (2008).
  16. Slavtchev S., Kalitzova-Kurteva P., The effect of surface-active solutes on Marangoni instability in liquid-liquid systems, J. Calcutta Math. Soc., vol. 3, No. 1 & 2, pp. 25-52 (2007).
  17. Hennenberg M., Slavtchev S., Weyssow B., Scheid B., Coupling between stationary Marangoni and Cowley-Rosensweig instabilities in a deformable ferrofluid layer, FDMP: Fluid Dynamics and Materials Processing, vol. 3, No. 4, pp. 295-302 (2007).
  18. Hennenberg M., Slavtchev S., Weyssow B., Thermal Marangoni instability and the magnetic pressure for a thin ferrofluid layer, Preliminary Proc. of 2007 Interdisciplinary Transport Phenomena V, Bansko, Bulgaria, October 14-19, 2007, ITP-07-58, pp. 12-39 – 12-51 (Ed. by S.S. Sandhal).
  19. Slavtchev S., Hennenberg M., Marangoni instability due to mass transfer in two-liquid systems, In: Proc. 4th Intern. Berlin Workshop - IBW 4 on Transport Phenomena with Moving Boundaries, 27-28 September 2007, Berlin, Germany, Fortschritt-Berichte VDI, Reihe 3, Nr. 883, Dusseldorf, VDI-Verlag, pp. 30-50 (2007).
  20. Slavtchev S., Kalitzova-Kurteva P., Influence of surface-active solutes on Marangoni instability in liquid-liquid systems, In: Mathematics and Education in Mathematics 2007, Proc. 36th Spring Conf. of Union of Bulg. Mathematicians, 2-6 April 2007, Varna, Bulgaria, Union of Bulg. Mathematicians, Sofia, pp. 305-311 (2007).
  21. Hennenberg M., Weyssow B., Slavtchev S., Desaive Th., Scheid B., Steady flows of laterally heated ferrofluid layer: Influence of inclined strong magnetic field and gravity level, Physics of Fluids, vol. 18, issue 9, Sept. 2006, Art. No. 093602 (2006).
  22. Slavtchev S., Kalitzova-Kurteva P., Mendes A., Marangoni instability of liquid-liquid systems with a surface-active solute, Colloids and Surfaces A: Physicochemical and Engineering Aspects, vols. 282-283, pp. 37-49 (2006).
  23. Hennenberg M., Weyssow B., Slavtchev S., Alexandrov V., Scheid B., Gravity level influence on a laterally heated ferrofluid submitted to an oblique strong magnetic field, Z. Phys. Chem., vol. 220, pp. 199 – 208 (2006).
  24. Slavtchev S., Simeonov, G., Oron, A., Marangoni instability of binary mixtures in the presence of nonlinear Soret effect, In: THERMODIFFUSION: Basics & Applications, Proc. IMT7, 27 May – 2 June 2006, San Sebastian, Spain (Eds. M.M. Bou-Ali and J.K. Platten), Mondragon Univ., pp. 189-195 (ISBN 84-689-8814-6) (2006).
  25. Kalitzova-Kurteva P., Slavtchev S., Mendes A., Marangoni instability of liquid-liquid systems with a surface-tension-increasing solute, J. Theor. Appl. Mech., vol. 36, No. 4, pp. 17-38 (2006).
  26. Pesheva N., Stefanov I., Slavtchev S., Application of the percolation theory to water-gas flows in artificial soils: Part II. Invasion percolation model with randomly distributed extraction sites, In: Proc. 11th Workshop on Transport Phenomena in Two-Phase Flow, 1-5 Sept. 2006, Sunny Beach, Bulgaria (Ed. by J. Hristov), pp. 69–76 (ISBN-13: 978-954-9380-05-7) (2006).
  27. Hennenberg M., Slavtchev S., Weyssow B., Scheid B., Stationary thermocapillary instability in a thin ferrofluid layer submitted to a weak magnetic field, In: Proc. 11th Workshop on Transport Phenomena in Two-Phase Flow, 1-5 Sept. 2006, Sunny Beach, Bulgaria (Ed. by J. Hristov), pp. 143 – 156 (ISBN-13: 978-954-9380-05-7) (2006).
  28. Hennenberg M., Weyssow B., Slavtchev S., Alexandrov V., Linear Marangoni and Rayleigh-Taylor instabilities of a ferrofluid thick layer, in a vertical magnetic field, J. Non-equilibrium Thermodynamics, vol. 30, pp. 189 – 204 (2005).
  29. Hennenberg M., Weyssow B., Slavtchev S., Alexandrov V., Desaive Th., Rayleigh-Marangoni-Benard instability of a ferrofluid layer in a vertical magnetic field, J. Magnetism and Magnetic Materials, vol. 289, pp. 268-271 (2005).
  30. Slavtchev S., Kalitzova-Kurteva P., Mendes A., Marangoni convection in binary liquid-liquid systems with added surface-active solutes, In: 3rd International Berlin Workshop (IBW3) on Transport Phenomena with Moving Boundaries, 6th-7th October 2005, Berlin, Germany, pp. 48-62 (ISBN 3-00-017322-6) (2005).
  31. Slavtchev S., Alexandrov V., An axisymmetric capillary flow in a Hele-Shaw cell, In: Proc. 10th Jubilee Congress Theor. Appl. Mech., 13-16 Sept. 2005, The “St. Konstantin and Helena” Resort, Varna, Bulgaria, Prof. Marin Drinov Acad. Publishing House, Sofia, vol. 1, pp. 584-588 (2005).
  32. Slavtchev S., Mendes M.-A., Marangoni instability in binary liquid-liquid systems, Int. J. Heat Mass Transfer, vol. 47, pp. 3269-3278 (2004).
  33. Slavtchev S., Hennenberg M., Marangoni convection due to mass transfer in two layer systems, In: Proc. 2nd International Berlin Workshop – IBW2 on Transport Phenomena with Moving Boundaries, 9-10 October 2003, Berlin, Germany, Fortschrit-Berichte VDI, Reihe 3, Nr. 817, Dusseldorf, VDI-Verlag, pp. 188-201 (2004).
  34. Kalitzova-Kurteva P., Slavtchev S., Mendes M.-A., Marangoni convection in binary liquid-liquid systems in the presence of surfactants, In: Proc. 10th Int. Summer School of Chem. Engineering, 24-31 May 2004, Varna, Bulgaria, (Eds. Ts. Sapundzhiev and R. Popov), pp. 205-209 (2004).
  35. Hennenberg M., Slavtchev S., Weyssow B., Thermocapillary flow in a horizontal ferrofluid layer submitted to a longitudinal temperature gradient and an oblique large magnetic field, In: Proc. 8th Workshop on Transport Phenomena in Two-Phase Flow, Sunny Beach’2003, 13-18 Sept. 2003, Bourgas – Sunny Beach, Bulgaria (Eds. Ch. Boyadjiev and J. Hristov), pp. 11-18 (2003).
  36. Miladinova S., Slavtchev S., Lebon G., Legros J.-C., Long-wave instabilities of non-uniformly heated films, J. Fluid Mech., vol. 453, pp. 153-175 (2002).
  37. Slavtchev S., Miladinova S., Long-wave instabilities of non-uniformly heated falling liquid films, In: Proc. First Conf. On Transport Phenomena with Moving Boundaries, 11-12 October 2001, Berlin, Germany, Fortschrit-Berichte VDI, Dusseldorf, VDI-Verlag, pp. 168-177 (2002).
  38. Hennenberg M., Weyssow B., Slavtchev S., Legros J.-C., Coupling between Marangoni and Rosensweig instabilities. Part I: The transfer wave, European Phys. J., Applied Physics, vol. 16, pp. 217-229 (2001).
  39. Miladinova S. P., Slavtchev S. G., Weakly nonlinear Marangoni instability in the presence of a magnetic field: effect of the boundary conditions and magnetic Prandtl number, Fluid Dynamics Research, vol. 28, pp.111-125 (2001).
  40. Slavtchev S., Hennenberg M., Mendes-Tatsis M.A., Legros J.-C., Interfacial rheology and Marangoni instability, Bulg. Chem. Communications, vol. 33, No.3/4, pp. 297-319 (2001).
  41. Slavtchev S., Miladinova S., Lebon G., Legros J.-C., , Marangoni effect on the instability of non-uniformly heated falling liquid films, In: Proc. 1st Intl. Symp. on Microgravity Research & Applications in Physical Sciences & Biotechnology, 10-15 Sept. 2000, Sorrento, Italy, ESA SP-454, vol. 1, pp. 33-41 (2001).
  42. Hennenberg M., Slavtchev S., Weyssow B., Legros J.-C., On the Earnshaw and the Van den Tempel-Lucassen compositional viscoelastic theories, J. Colloid Interface Sci., vol. 230, pp. 216-218 (2000).
  43. Slavtchev S. G., Kalitzova-Kurteva P., Kurtev I., Marangoni instability in a binary liquid layer due to non-isothermal gas absorption, Z. Angew. Math. Mech., vol. 80, supp3, pp. S707-S708 (2000).
  44. Slavtchev S., Simeonov G., Van Vaerenbergh S., Legros J.C., Marangoni instability of a layer of binary liquid in the presence of nonlinear Soret effect, Int. J. Heat Mass Transfer, vol. 42, pp. 3007-3011 (1999).
  45. Slavtchev S., Hennenberg M., Legros J.-C., Lebon G., Stationary solutal Marangoni instability in a two-layer system, J. Colloid Interface Sci., vol. 203, pp. 354-368 (1998).
  46. Slavtchev S. G., Miladinova S. P., Thermocapillary flow in a liquid layer at minimum in surface tension, Acta Mechanica, vol.127, pp. 209-224 (1998).
  47. Miladinova S. P., Slavtchev S. G., Weekly nonlinear Marangoni convection under an external magnetic field, Z. Angew. Math. Mech., vol. 78, pp. 345-357 (1998).
  48. Slavtchev S.G., Kalitzova-Kurteva P.G., Kurtev I.A., Oscillatory Marangoni instability in a liquid layer with temperature-dependent viscosity and deformable free surface, Microgravity Science and Technology, Int. J. for Microgravity Research and Applications, vol. 11, No. 1, pp. 29-34 (1998).
  49. Slavtchev S., Miladinova S., Kalitzova-Kurteva P., Unsteady film flow of power-law liquids on a rotating disk, J. Non-Newtonian Fluid Mech., vol. 66, pp. 117-125 (1996).
  50. Bragard J., Slavtchev S. G., Lebon G., Nonlinear solutal Marangoni instability in a liquid layer with an absorbing upper surface, J. Colloid Interface Sci., vol. 168, pp. 402-413 (1994).
  51. Slavtchev S., Ouzounov V., Stationary Marangoni instability in a liquid layer with temperature-dependent viscosity, in microgravity, Microgravity Quarterly, vol. 4, pp. 33-38 (1994).
  52. Kozhoukharova Zh., Slavtchev S., Influence of the surface deformability on Marangoni instability in a liquid layer with surface chemical reaction. II. Overstability, J. Colloid Interface Science, vol. 152, pp. 473-482 (1992).
  53. Kozhoukharova Zh., Slavtchev S., Influence of the surface deformability on Marangoni instability in a liquid layer with surface chemical reaction. I. Stationary convection, J. Colloid Interface Science, vol. 148, 42-55 (1992).

 

Projects:

 

National Projects (leadership)

 

2003-2007 „Mathematical modeling of transport of fluid and nutrients in capillary-porous media” – project No. KI-1-02/03 of the Ministry of Education and Science, Sofia. ”

 

International Projects (leadership)

 

2008-2010 “Marangoni instability in binary systems with the nonlinear Soret effect”, Joint research project between the Department of Fluid Mechanics and Technion-Haifa, Israel.

2006–2008 “Hydrodynamic instability of ferrofluids subjected to magnetic and thermal fields”, Joint research project between the Department of Fluid Mechanics and Université Libre de Bruxelles, Brussels, Belgium.

2005–2007 “Marangoni convection in binary systems with the Soret effect”, Joint research project between the Department of Fluid Mechanics and Technion-Haifa, Israel.

2002–2005 “Hydrodynamic instability of a ferrofluid layer heated laterally and subjected to strong magnetic field”, Joint research project between the Department of Fluid Mechanics and Université Libre de Bruxelles, Brussels, Belgium.

2001–2003 “Marangoni convection in binary liquid/liquid systems with added surfactants”, Joint research project between the Department of Fluid Mechanics and the Imperial College, London, UK.

1999–2001 “Improvement of evaporators for nutritional liquids by enhanced surfaces”, INCO-Copernicus Project IC15-CT98-0908 (Fourth Framework Program of EU).

1999–2001 “Experimental and theoretical study of liquid films on a non-uniformly heated wall”, Joint research project between the Department of Fluid Mechanics and the Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia.

1998–2000 “Instabilities due to solute transfer between two liquids in the presence of interfacial resistance”, Joint research project between the Department of Fluid Mechanics and Universite Libre de Bruxelles, Belgium.

1995–1997 “Heat and mass transfer in non-homogeneous systems”, PECO Project ERB CIPD- CT94-0035 (Third Framework Program of EU).

1995–1998 “Interaction between volume and surface electrohydrodynamic instabilities”, Joint research project between the Department of Fluid Mechanics and the Laboratory of Electrostatics and Dielectric Materials, CNRS, Grenoble, France.

 

Membership:

 

Union of the Bulgarian Scientists

Union of the Bulgarian Mathematicians

 

Honors:

 

1989 - Insignia of Honor awarded by the Bulgarian Academy of Science

2004 - First Price of the Union of the Bulgarian Scientists for scientific achievements.


Modified date:01-06-2022