USA, Pasadena, 1981, IUTAM Symposium on Physics and Mechanics of Bubbly Liquids (Invited lecturer, Member of Scientific Committee).

FRANCE, Grenoble, 1983, Colloquium Evromech on Mechanics of Two Phase Flow (Invited lecturer).

YUGOSLAVIA, Belgrade, 1985, Visiting Professor at Belgrade University and Boris Kidrich Institute of Nuclear Engineering.

YUGOSLAVIA, Dubrovnik, 1987, ICHMT Seminar on Transient Two Phase Flows (Invited lecturer, Member of Scientific Committee).

CHINA, Xian, 1989, International Conference on Mechanics of Multiphase Flow (Invited lecturer) .

BULGARIA, Sophia, 1989, Visiting Professor at Sophia University and Institute of Mechanics and Biomechanics.

CHINA, Harbine, 1990, Visiting of Harbine Shipbuilding Institute.

SWITZERLAND, Zurich, 1990, Visiting-Professor at Swiss Federal Institute of Technology (ETH).

TURKEY, Izmir - Cesme, 1990, NATO Advanced Study Institute of Heat and Mass Transfer in Porous Media (Invited lecturer).

ISRAEL, Jerusalem, 1990, IX International Conference on Heat Transfer (Invited lecturer).

PORTUGAL, Vilamoura, 1991, II European Conference on Industrial Furnaces and Boilers (Invited lecturer).

YUGOSLAVIA, Dubrovnik, 1991, International Seminar on Heat and Mass Transfer in Porous Media (Invited lecturer, Member of Scientific Committee).

USA, Stanford, Oxford, Minneapolis, Maryland, Santa Barbara, Boston, New York, 1991, IUTAM Symposium on Mechanics of Fluidized Bed (Invited lecturer, Member of Scientific Committee), Visiting and Lecturing in the Universities and Control Data Corporation.

JAPAN, Tsukuba, 1991, International Conference on Multiphase Flow (Invited lecturer, Member of Scientific Committee).

ALGERIA, Algeria, 1992, Scientific Consulting of Business Delegation.

GREAT BRITAIN, London, 1992, III International Workshop on Fundamentals of Multiphase Flows (Invited speaker).

GERMANY, Karlsruhe, Erlangen, Munchen, 1992, Visiting Professor at Kernforchungszentrum and Universities.

FRANCE, Paris, Grenoble, Lion, February-March 1993, Visiting-Professor at Pier and Marie Curie University.

TURKEY, Izmir-Cesme, 1993, NATO Advanced Study Institute on Cooling of Electronic Systems (Invited speaker).

GREAT BRITAIN, Birmingham, 1993, IUTAM Symposium, Bubble Dynamics and Interface Phenomena (Invited lecturer, Member of Scientific Committee) .

USA, Troy, NY, 1993-present, Visiting Professor at Rensselaer Polytechnic Institute.

JAPAN, Kyoto, 1995, 2-nd International Conference on Multiphase Flow (Invited First Plenary Lecturer at the Opening Session, Member of Organizing Committee).

RUSSIA, Kazan, 1995, IV International Conference “Lavrentyev Readings on Mathematics, Mechanics and Physics” (Invited Plenary Lecturer, Member of Program Committee)

USA, Saratoga Springs, 1995, 7-th International Conference on Nuclear Thermohydraulics (NURETH-7) (Invited Plenary Lecturer at the Opening Session, Member of Program Committee)

USA, Minneapolis, 1996, IMA Workshop, Particulate Flows: Processing and Rheology (Invited Plenary Speaker).

FRANCE, Paris, May-August 1996, January-February, June-July 1997, Visiting-Professor at Pierre and Marie Curie University.

USA, Seattle, August 1997, NATO Advanced Study Institute on Sonochemistry and Sonoluminescence (Invited Lecturer).

CHINA, Beijing, October 1997, International Seminar on Multiphase Flow (Member of Scientific Committee, Invited lecturer)

TURKEY, Istanbul, April 1998, Evromech Conference on Waves in Two-Phase Flows (Invited lecturer).

USA, Seattle, June 1998, 16-th International Congress on Acoustics and 135-th Meeting Acoustical Society of America (Invited Plenary Speaker).

FRANCE, Giens, September-October 1998, International Symposium on Computer Methods for Engineering in Porous Media Flow and Transport (Invited lecturer).

GREAT BRITAIN, May 1999, Isaac Newton Institute for Mathematical Sciences, University of Cambridge, Visiting Fellowship (program on Turbulence).

TURKEY, Izmir-Cesme, 2002, NATO Advanced Study Institute on Low-Temperature and Cryogenic Refrigeration: Fundamentals and Applications (Invited speaker).

POLAND, Kielce, 2002, Conference on Heat Transfer and Transport Phenomena in Multiphase Systems (Invited speaker, Member of Scientific Committee).

USA, Miami, Florida, June 2002, Annual Meeting of the American Nuclear Society (Invited Speaker).

RUSSIA, Moscow, August 2002, IV Euromech Conference on Nonlinear Oscillations (Invited Plenary Speaker)

RUSSIA, Moscow, August 2002, XVI International Symposium on Nonlinear Acoustics (Invited Speaker).

USA, Nashville, Tennessee, May 2003, 145-th Meeting of the Acoustical Society of America (The First Invited Speaker on the special session on Bubble Fusion Perspectives).

USA, Arlington, Virginia, June 2003, Sonoluminescence and Induced Fusion Workshop, Defense Advanced Research Project Agency (DARPA) (Invited Speaker).

RUSSIA, Moscow, August 2004, International Conference on Combustion and Detonation (Zel’dovich Memorial) (Plenary Speaker).

RUSSIA, Cheboksary, June 2004, II International Summer School «HIGH SPEED HYDRODYNAMICS» (Invited Speaker)

ITALY, Pisa, ITALY, September 2004, III International Symposium on Two-phase Flow Modeling and Experimentation (Invited lecturer),

USA, New Jersey, November, 2004, New Jersey Institute of Technology (Invited lecturer),

USA, West Lafayette, Indiana, November, 2004, Purdue University (Invited lecturer),

USA, Tucson, Arizona, November, 2004, The University of Arizona (Invited lecturer),

FRANCE, Avignon, France, September 2005, Nuclear Reactor Thermohydrolics – NURETH-11 (Invited Speaker on the Plenary Session),

RUSSIA, Snezjinsk, Chelyabinsk, 2005, Zababakhin Nuclear Center of Russia (Invited Speaker),

CHINA, Xian, 2005, International Conference on Multiphase Flows and Energy Transformations, Invited Plenary Speaker,),

RUSSIA, N-Novgorod, 2006, Russian Congresses on Theoretical and Applied Mechanics (Plenary Speaker,),

FRANCE, Lyon, June 2007 International Colloquium in honor of Professor Jean Bataille (Invited lecturer)