Microhydrodynamics, complex fluids and optofluidics

Participants: Juan Rodrigo Vélez-Cordero

Im interested in the “structures” (streamlines) formed in fluid media by the action of internal/external forces and how they affect the relevant transport phenomena. The figures below show the streamlines and velocities formed in different setups that I have been interested on; (top, from left to right): experimental streamlines formed behind a bubble rising in a complex fluid showing a negative wake. The figure at the right shows instantaneous streamlines formed by an oscillating flexible flapper: shift of the vortex center is the key factor to understand the net pumping produced by this device. (bottom, from left to right): theoretical streamlines formed by ciliated carpets immersed in mucus (non-Newtonian shear-thinning fluids); the figure at the right shows the liquid velocity magnitude produced by the rise of several bubbles, a numerical code was used in this case.

Current interests:

  1. Brownian motion of colloids trapped in soft spheres; these spheres are made by oil-water emulsions using different liquids (oil-in-water or water-in-oil emulsions) and surfactants. Colloid transport at solid-liquid-gas menisci.
  2. Active microrheology based on optical traps and microfluidic designs.
  3. Two phase flows in microchannels produced by nucleation and evaporation of the liquid (experiments and simulations using COMSOL multiphysics).
  4. Opto-fluidics and interaction of light with microparticles.


  1. J. Rodrigo Vélez-Cordero, J. Hernández-Cordero, On the motion of carbon nanotube clusters near optical fiber tips: Thermophoresis, Radiative pressure, and Convection effects. Langmuir 31 (2015) 10066.

  2. J. Rodrigo Vélez-Cordero, J. Hernández-Cordero, Heat generation and conduction in PDMS-carbon nanoparticle membranes irradiated with optical fibers, Internatinal Journal of Thermal Science 96 (2015) 12.

  3. J. Rodrigo Vélez-Cordero, Misael Giovani Pérez Zúñiga, J. Hernández-Cordero, An optopneumatic piston for microfluidics, Lab Chip 15 (2015) 1335.

  4. A.M. Velázquez-Benítez, Moisés Reyes-Medrano, J. Rodrigo Vélez-Cordero, J. Hernández-Cordero, Controlled Deposition of Polymer Coatings on Cylindrical Photonic Devices, IEEE/OSA Journal of Lightwave Technology 33 (2015) 176.

  5. J. Rodrigo Vélez-Cordero, Johanna Lantenet, Juan Hernández-Cordero, Roberto Zenit, Compact bubble clusters in Newtonian and non-Newtonian liquids, Phys. Fluids 26 (2014) 053101.

  6. J. Rodrigo Vélez-Cordero, A.M. Velázquez-Benítez, J. Hernández-Cordero, Thermocapillary flow in glass tubes coated with photoresponsive layers, Langmuir 30 (2014) 5326.

  7. Roger M. Arco, J. Rodrigo Vélez-Cordero, Eric Lauga, Roberto Zenit, Viscous pumping inspired by flexible propulsion, Bioinspir. Biomim. 9 (2014) 036007.

  8. J. Rodrigo Vélez-Cordero, Eric Lauga, Waving transport and propulsion in a generalized Newtonian fluid, J.  Non-Newtonian Fluid Mech. 199 (2013) 37.

  9. D. Legendre, R. Zenit, J. Rodrigo Vélez-Cordero, On the deformation of gas bubbles in liquids, Phys. Fluids 24 (2012) 043303.

  10. J. Rodrigo Vélez-Cordero, D. Sámano, R. Zenit, Study of the properties of bubbly flows in Boger-type fluids, J.  Non-Newtonian Fluid Mech. 175 (2012) 1.

  11. J. Rodrigo Vélez-Cordero, D. Sámano, R. Zenit, Bubble Clusters in Associative Polymers. Part VII Gallery of Fluids. Experimental and Theoretical Advances in Fluid Dynamics, Jaime Klapp etal. (eds.), Springer-Verlag, Berlin 2012.

  12. J. Rodrigo Vélez-Cordero, D. Sámano, P. Yue, J. Feng, R. Zenit, Hydrodynamic interaction between a pair of bubbles ascending in shear-thinning inelastic fluids. J. Non-Newtonian Fluid Mech. 166 (2011) 118.

  13. J. Rodrigo Vélez-Cordero, R. Zenit, Bubble cluster formation in shear-thinning inelastic bubbly columns. J. Non-Newtonian Fluid Mech. 166 (2011) 32.



Last Uptade: January 2015