Institute of Mechanics

Position: Research associate

Department: Complex and Multiphase Flow

Room number: 324

Phone: +359 2 9796454

E-mail: koval@imbm.bas.bg

Scientific degrees, institution, year:

Doctor in mathematics, Bulgarian Academy of Sciences – Sofia University “Sveti Kliment Ohridski”, 1992

Fields of Research:

Fluid Mechanics, Heat/Mass Transfer

Recent Publications:

1. A.I. Zhurov, N. Kovacheva, Linear Shear Flow around Porous Sphere, 10^th Jubilee National Congress on Theoretical and Applied Mechanics, Varna 13-16 September 2005, pp.642-647

2. Toshev, E. and Kovacheva, N., Hydrodynamic Interaction between Solid Spherical Particle and Solid Wall, 9^th Workshop on Transport Phenomena in Two-phase Flow, Borovetz, Bulgaria, pp.63-68, 2004.

3. Polyanin, A.D., Zhurov, A.I., and Kovacheva, N.T., Structure of the Solutions of Linear Nonhomogeneous Heat and Mass Transfer Problems, Journal of Theoretical and Applied Mechanics, Sofia, vol.33, No.1, pp.29-44, 2003.

4. Kovacheva, N.T., Secondary Streaming Generated by the High-Frequency Translational Oscillations of the Inner Sphere in Eccentric Spherical Annuli, Proc. of the 9th National Congress on Theoretical and Applied Mechanics, 19-22 September 2001, vol. 2, pp.36-41.

Some works published in Acta Mechanica and ZAMM:

1. Kovatcheva, N.T., and Roesner, K.G., Investigation of Secondary Flows Around Oscillating Bodies Using Computer Algebra, ZAMM (Z. angew. Math. Mech.), v.75, SII, pp.535-536, 1995.

2. Kovatcheva, N.T., Polyanin, A.D., and Kurdjumov, V.N., Mass Transfer from a Particle in a Shear Flow with Surface Reactions, Acta Mechanica 101, pp.155-160, 1993.

3. Kovatcheva, N.T., and Polyanin, A.D., Convective Diffusion of Particles in a Viscous Liquid with a Variable Diffusion Coefficient, Trends in Applications of Mathematics to Mechanics (Proc. 8^th Symposium on "Trends in Applications of Mathematics to Mechanics", Hollabrunn, Austria, 1989) edited by Wilhelm Schneider, Hans Troger, Franz Ziegler, Longman Scientific & Technical, pp.158-162, 1991 (copublshed in the United States with John Wiley & Sons, Inc., New York).

4. Kovatcheva, N.T., Polyanin, A.D., and Zapryanov, Z.D., The Change of the Diffusivity with the Change of the Concentration of the Solvent in a Solution,. Acta Mechanica 80, pp.259-272, 1989

5. Kovatcheva, N.T., Christov, Ch.I., and Zapryanov, Z.D., Secondary Streaming for the High-Frequency Viscous Flow in Eccentric Spherical Annuli, ZAMM (Z. angew. Math. Mech.), v.68, No.2, pp.121-125, 1988.

Recent Projects:

Modeling and numerical simulation in multiphase media with rigid particles and bubbles ( connected with a modeling and optimization of the technological processes as flotation, separation and fluidization of the rigid particles).

Membership: EUROMECH

Institute of Mechanics tel.: +359 2 973 31 40; fax: +359 2 870 74 98; e-mail: office@imbm.bas.bg