Στοιχεία Βιογραφικού

1. Interfacial phenomena

• Nonlinear analysis of fluid flow with free and moving boundaries
• Stability and Dynamic analysis of liquid films over solid and liquid substrates

Indicative applications:

1. Determination of conditions leading to different flow patterns (trickling, pulsing, spray, bubble) in packed beds.
2. Motion, interaction, coagulation and removal of drops and bubbles from their suspensions in Newtonian and nonNewtonian liquids
3. Film flow of micro-structured liquids over solid substrates with variable topography.
4. Cavitation and fibrillation during the extensional flow and the probe test of adhesive (polymeric) materials

2. Fluid Mechanics and Transport Phenomena applied in the production of new materials

• Operation limits and dynamics of processes used in the fabrication of polymeric, ceramic and electronic materials.

Indicative applications:

1. Study of the Film-Blowing process for the production of thin polymeric films.
2. Study of polymer extrusion to determine the conditions leading to unacceptable deformation of their surface and variation of their thickness.
3. Study of the Blow-Molding process for the production of plastic containers
4. Study of the Spin-Coating Process for the production of electronic storage devices
5. Fabrication of new materials by Chemical Vapor Infiltration & Chemical Vapor Deposition.

3. Applied mathematics and computational Analysis

• Computer-aided process and stability analysis based on bifurcation theory.
• Development of modern computational methods combining Finite Elements, Boundary Elements, Spectral Elements, Finite Differences etc. and their optimization depending on the application
• Singular perturbation methods using symbolic manipulators.

• Varchanis, S., Haward, S.J., Hopkins C.C., Syrakos, A., Shen, A.Q., Dimakopoulos, Y. and Tsamopoulos, J., Transition between solid and liquid state of yield-stress fluids under purely extensional deformations”, Proceed. National Academy of Sciences, USA (PNAS) 117 (23) 12611-12617 (2020). https://doi.org/10.1073/pnas.1922242117

• Esposito, G., Dimakopoulos, Y. and Tsamopoulos, J., “Buoyancy driven flow of a viscous drop in viscoelastic materials”, J. Non-Newtonian Fluid Mech., 321, 105124, (2023). https://doi.org/10.1016/j.jnnfm.2023.105124.

• Moschopoulos, P., Kouni, E., Psaraki, K., Dimakopoulos, Y., and Tsamopoulos, J. “Dynamics of elastoviscoplastic filament stretching” Soft Matter. 19, 4717-4736, (2023),   https://doi.org/10.1039/D3SM00143A

• Marousis, A., Pettas, D., Karapetsas, G. Dimakopoulos, Y. and Tsamopoulos, J. "Stability analysis of viscoelastic film flows over an inclined substrate with rectangular trenches” J. Fluid Mech., 915, A98, (2021) https://doi.org/10.1017/jfm.2021.163

• Calabrese, V. Varchanis, S. Haward, S., Tsamopoulos, J. and Shen, A., “Structure-property relationship of a soft colloidal glass in simple and mixed flows” J. Coll. Interf. Sci. 601, 454-466, (2021) https://doi.org/10.1016/j.jcis.2021.05.103

• Varchanis, S., Pettas, D., Dimakopoulos, Y. and Tsamopoulos, J. “On the origin of the sharkskin instability: Nonlinear dynamics”, Phys. Rev. Let., 127, 088001 (2021) https://link.aps.org/doi/10.1103/PhysRevLett.127.088001

• Kordalis, A., Pema, D., Androulakis, S., Dimakopoulos, Y, and Tsamopoulos, J. “Hydrodynamic interaction between coaxially rising bubbles in elastoviscoplastic materials: Equal bubbles” Phys. Rev. Fluids 8, 083301 (2023), DOI: https://link.aps.org/doi/10.1103/PhysRevFluids.8.083301.