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Cycle: 
23 cycle
Tutor: 
Prof. Katepalli R. Sreenivasan
Advisor: 
Prof. Daniel P. Lathrop, University of Maryland, College Park
Scientific Activity: 

Enrico studies the so called 'quantum turbulence', through a direct visualization technique. When the liquid helium is cooled below 2.17K it becomes a superfluid. Superfluidity is an macroscopic quantum effect, analogus to superconductivity and Bose Eintein condensation. Beside haveing zero viscosity, a superfluid cannot have any vorticity except than on topological defects: the quantized vortices. These vortices are macroscopic in length but have a core of atomic size. For this reason they are nominally invisible. Recently a technique has been developed to visualize them using solid hydrogen particles. With these particles decorating the vortex cores, fascinating movies of the dynamics of the vortices can be taken, which give a completely new insight on their beheaviour. Beside its intrinsic interest, these studies could shed light on long range quantum order phenomena, transition phenomena, reconnection events in astrophysics and even provide a better understanding of the classical turbulence.

Background: 

Enrico Fonda received a BSc in Physics, in 2004 and a MSc in Theoretical Physics in 2007 from Università degli Studi di Trieste, Italy.

Publications: 
  • Fonda, E., Sreenivasan, K.R. & Lathrop, D.P., 2012. Liquid nitrogen in fluid dynamics: Visualization and velocimetry using frozen particles. Review of Scientific Instruments, 83(8), p.085101.
Conferences: 
  • Tessarotto Marco, Fonda E., Tessarotto Massimo Computational Complexity of Traditional Lattice-Boltzmann Methods for Incompressible Fluids AIP Conf. Proc. 1084, 470 (2008)
  • Fonda E., Tessarotto Massimo, Nicolini P., Ellero M. Lattice-Boltzmann Inverse Kinetic Approach for Classical Incompressible Fluids AIP Conf. Proc. 1084, 164 (2008)
  • Gaff K.T., Fonda E., Paoletti M.S., Sreenivasan K.R., Lathrop D.P. Imaging an Array of Quantum Tornadoes Lay-Language Version of "Dynamics of the Lattice Array Formation in Superfluid Helium" DFD meeting 2009, Minneapolis, November 22-24 2009
  • Gaff K.T., Fonda E., Paoletti M.S., Sreenivasan K.R., Lathrop D.P. Dynamics of the Lattice Array Formation in Superfluid Helium DFD meeting 2009, Minneapolis, November 22-24 2009 http://meetings.aps.org/link/BAPS.2009.DFD.ET.3
  • Fonda E., Gaff K.T., Paoletti M.S., Sreenivasan K.R., Lathrop D.P. Visualization of quantized vortices near the λ-transition using nanoparticles DFD meeting 2009, Minneapolis, November 22-24 2009 http://meetings.aps.org/link/BAPS.2009.DFD.ET.4
  • Fonda E., Gaff K.T., Paoletti M.S., Sreenivasan K.R., Lathrop D.P. Visualization of quantized vortices dynamics using nanoparticles Applied Dynamics Seminars, IREAP, University of Maryland, April 1 2010
  • Enrico Fonda, Kristina T. Gaff, Matthew S. Paoletti, Katepalli R. Sreenivasan, Daniel P. Lathrop, Visualization of quantized vortex dynamics using ice particles, QFS 2010, International Symposium on Quantum Fluids and Solids, Grenoble
  • Enrico Fonda, Matthew S. Paoletti, Katepalli R. Sreenivasan, Daniel P. Lathrop, Particles for flow visualization and velocimetry in liquid nitrogen, DFD meeting 2010, South Beach
  • Enrico Fonda, Matthew S. Paoletti, Katepalli R. Sreenivasan, Daniel P. Lathrop,Visualization of counterflow dynamics using frozen nanoparticles, APS March Meeting 2011, Dallas
  • Enrico Fonda, Katepalli R. Sreenivasan, Daniel P. Lathrop, Novel Cryogenic Turbulence Experiments, 2011 Research Symposium on Environmental and Applied Fluid Dynamics, John Hopkins University
  • Enrico Fonda, Matthew S. Paoletti, Michael E. Fisher, Katepalli R. Sreenivasan, Daniel P. Lathrop, Visualization of Quantum Turbulence, Invited talk at 26th International Conference on Low Temperature Physics, Beijing