Members of the group

Heliodoro González García
Associate Professor
e-mail: helio@us.es

Education: PhD in Physics, 1991, University of Seville.
Doctoral thesis: Stability of liquid bridges subjected to irrotational electric fields in a microgravity environment. Supervisor: Antonio Castellanos Mata.

Main scientific results:

The sufficiently strong longitudinal electrical fields stabilize dielectric liquid bridges even in the presence of gravity and with liquid zones in rotation, the more the greater the permittivity of the liquid. The residual conductivity forces to use alternating fields, but the associated parametric resonance does not destabilize the liquid column if it has a certain viscosity.
Alternating longitudinal magnetic fields sufficiently intense stabilize conductive liquid bridges if the penetration of the field in the liquid is small in relation to the radius of the bridge.
Surfaces of conductive liquids confined circularly and subjected to perpendicular electric fields are destabilized forming tips for critical fields higher than those needed on unlimited surfaces. The first unstable pattern is not axisymmetric, and has a crest and a valley. Confinement in grooves also requires more intense fields for their de-stabilization, and produces aligned peak patterns.
Conductive jets subjected to alternating radial electric fields may have parametric instabilities for wavelengths outside the range of electrocapillary instability with continuous fields. Mixed fields (with ac and dc components) increase the number of unstable windows. Viscosity very effectively dampens parametric instability.
The capillary jets in the low speed regime experimentally verify the Rayleigh curve with great precision. In these jets there are capillary space modes (downstream and upstream), inertial and hydrodynamic.

Main scientific publications:
Stabilization of Dielectric Liquid Bridges by Electric Fields in the Absence of Gravity. Journal of Fluid Mechanics. Vol. 206. 1989. Pag. 545-561.

Authors: Heliodoro González García, F. M. J. Mccluskey, Antonio Castellanos Mata, Antonio Barrero Ripoll.

Influence of Bounded Geometry on Electrocapillary Instability. Physical Review B . Vol. 50. Num. 4. 1994. Pag. 2520-2528.

Authors: Heliodoro González García, Gilles Néron de Surgy, Jean Pierre Chabrerie.

Stability of Inviscid Conducting Liquid Columns Subjected to A.C. Axial Magnetic Fields. Journal of Fluid Mechanics. Vol. 265. 1994. Pag. 245-263.

Authors: Antonio Castellanos Mata, Heliodoro González García.

Stability Analysis of Conducting Jets Under AC Radial Electric Fields for Arbitrary Viscosity. Physics of Fluids . Vol. 15. Num. 2. 2003. Pag. 395-407.

Authors: Heliodoro González García, Fco. Javier García García, Antonio Castellanos Mata.

The Measurement of Growth Rates in Capillary Jets. Journal of Fluid Mechanics. Vol. 619. 2009. Pag. 179-212.

Authors: Heliodoro González García y Fco. Javier García García.


Popularization books:
Stabilization of a Dielectric Liquid Cylindrical Bridge Fields in the Absence of Gravity. Vol. 226. Pag. 193-202. En: Synergetics Order and Chaos. España. World Scientific Publishing Company. 1988.

Authors: Gañan Calvo, Alfonso Miguel; González García, Heliodoro; Mccluskey, F. M. J.; Castellanos Mata, Antonio.

Liquid Bridges Subjected to Electric Fields. Vol. 5. Pag. 193-208. En: Fluid Physics. Lecture Notes of the Summer School. London, Inglaterra. World Scientific Publishing Company. 1994.

Authors: Ramos Reyes, Antonio; González García, Heliodoro; Castellanos Mata, Antonio.



PhD supervisor:
One-dimensional models applied to liquid column Axisimetrics with and without electric field. Doctoral Thesis. 1998.

Author: García García, Francisco Javier.

Application of electric fields to capillary jets. Doctoral Thesis. 2011.

Author: Guerrero Millán, Josefa.



For any questions or suggestions contact me through my email.




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