People

Dr Alfonso Castrejon-Pita

Research Associate

Inkjet Research

Research interests

• Fluid dynamics, drops, jets, free surface flows
• Flow velocimetry
• Time series analysis, non-linear systems and synchronisation.
• Additive manufacturing/3D Printing

Background

Alfonso joined the Inkjet Research Centre as a Research Associate in April 2011. Alfonso did his MSc (Physics) at the National University of Mexico and his DPhil in Physics at the University of Oxford (Lady Margaret Hall). From October 2007 to March 2011, he was a Research Associate at the Clarendon Laboratory in Oxford funded by the National Environmental Research Council (NERC) . Alfonso is a member of St. John's College Cambridge and a senior member of Lady Margaret Hall Oxford. His research interests are focused on fundamental studies in fluid dynamics and non-linear systems.

Publications

• J. R. Castrejon-Pita, S. Hoath, A. A. Castrejon-Pita, N. F. Morrison, W-K Hsiao, I. M. Hutchings. “Time-resolved particle image velocimetry within the nozzle of a drop-on-demand printhead”, JIST Published Online Feb 2013.

• A. A. Castrejon-Pita, J. R. Castrejon-Pita, I. M. Hutchings “Experimental observation of von Karman vortex street in drop impact” Phys. Rev. E. 86, 045301(R) (2012).  

•  A. A. Castrejon-Pita, J. R. Castrejon-Pita, G. D. Martin “A novel method for on demand drop generation” Rev. Sci. Instr. 83, 115105 (2012)

• J. R. Castrejon-Pita, A. A. Castrejon-Pita, J. Hinch, J. Lister, I. M. Hutchings “Self-similar breakup of near-inviscid liquids” Phys. Rev. E 86, 015301(R) (2012).
  (Media coverage: http://physics.aps.org/synopsis-for/10.1103/PhysRevE.86.015301, http://www.businessinsider.com/why-all-faucet-drops-have-the-same-shape-2012-7, http://news.sciencemag.org/sciencenow/2012/07/video-why-all-faucet-drips-have-.html?ref=hp, and others ) . 

• A. A. Castrejon-Pita, J. R. Castrejon-Pita, I. M. Hutchings “Breakup of liquid filaments” Phys. Rev Lett. 108 (7), 074506 (2012)
  (Media coverage: http://physics.aps.org/articles/v5/21, http://phys.org/news/2012-02-fate-thin-liquid-filament-video.html, http://physicsworld.com/cws/article/news/2012/feb/22/lab-study-could-aid-inkjet-printing, http://www.theengineer.co.uk/production-engineering/news/droplet-generation-model-could-impact-upon-printing-industry/1011746.article and others)

• P. L. Read and A. A. Castrejon-Pita “Phase synchronization between stratospheric and tropospheric quasi-biennial and semi-annual oscillations” QJ Roya. Met Soc. Published online 5 Jan 2012.
• R. Castrejón-García, J. R. Castrejón-Pita, A. A. Castrejón-Pita, “Design, Development and Evaluation of a Simple Black-Body Radiative Source”. Review of Scientific Instruments, 81, 055106 (2010). 
• A. A Castrejón-Pita and P. L. Read. “Synchronization in a pair of thermally coupled rotating baroclinic annuli: Understanding atmospheric teleconnections in the laboratory” Physical Review Letters, 104, 204501 (2010) (Media coverage in Physical Review Focus http://focus.aps.org/story/v25/st19).

• A. A Castrejón-Pita and P. L. Read. “Synchronization in a pair of coupled two-layer quasigeostrophic model of baroclinic instability I: master-slave configuration” Nonlin. Proc. Geophys., 16, 543–556 (2009). 
• F. J. R. Eccles, P. L. Read, A. A. Castrejón-Pita, and T. W. N. Hayne. “Synchronization and chaos control of modulated travelling baroclinic waves in a periodically forced, rotating fluid annulus”, Physical Review E. 79(1), 015202(R) (2009) .
• A. A. Castrejón-Pita, J. R. Castrejon-Pita, G. Huelsz, A. Sarmiento-Galan. “Comments on ‘Acoustic chaos in a duct with two separate sound sources’ [J. Acoust. Soc. Am., 110, 120-126 (2001)]”, J. Acous. Soc. Am. 124, 2702 (2008).
• A. A. Castrejón-Pita and P. L. Read. “Synchronization in baroclinic systems”. Journal of Physic CS, 137, 012016 (2008).
• M. Torralba, A.A Castrejón-Pita, G. Hernandez, G. Huelsz, J. A. del Río, and J. Ortín. “Instabilities in the oscillatory flow of a complex fluid”, Physical Review E. 75, 056307 (2007). 
• A. A. Castrejón-Pita and G. Huelsz. “Heat to electricity thermoacoustic-magnetohydrodynamic conversion”, Applied Physics Letters, 90, 147110 (2007).
• A. A. Castrejón-Pita and P.L. Read. “Baroclinic waves in an air-filled thermally driven rotating annulus”Physical Review E, 75 026301 (2007). 
• J. R. Castrejón-Pita, A. A. Castrejón-Pita, G. Huelsz and R. Tovar. “Experimental demonstration of the Rayleigh acoustic viscous boundary layer theory”, Physical Review E, 73 036601 (2006). 
• A. A. Castrejón-Pita, J. R. Castrejón-Pita, A. Sarmiento-Galán and R. Castrejón-García. “The impressive complexity in the Nautilus pompilius shell”, Fractals, 11(2) 163(2003). 
• R. Castrejón-García, J.R. Varela, A. A. Castrejón-Pita, and J. R. Castrejón-Pita. “Development and evaluation of an alternative method for processing elastic-lidar return signals”, Int. Journal of Modern Physics B, 20(2), 141 (2006).
•  M. Torralba, J. R. Castrejón-Pita, A. A. Castrejón-Pita, A. del Río, G. Huelsz, and J. Ortín. “Measurements of the bulk and interfacial velocity profiles in oscillating Newtonian and Maxwellian fluids”, Physical Review E, 72 016308 (2005).
• A. A. Castrejón-Pita, J. R. Castrejón-Pita, and A. Sarmiento-Galán. “Breathers and Thermal Relaxation as a Temporal Process”, Chaos, 15 023501 (2005). 
• J. de Urquijo, A. A. Castrejón-Pita, J. L. Hernández-Ávila, and E. Basurto. “Electron transport and effective ionization coefficients in C2F6, C2F6-Ar and C2F6-N2 mixtures”, Journal of Physics D: Appl. Phys. 37 1774-1779 (2004). 
• A. A. Castrejón-Pita, A. Sarmiento-Galán, J. R. Castrejón-Pita, and R. Castrejón-García. “Fractal Dimension in Butterflies Wings: a novel approach to understanding wing patterns?”, Journal of Mathematical Biology, 50 (5) 584 (2004). 

•  A. F. Mendez-Sanchez, J. P. Gonzalez, L de Vargas, J. R. Castrejón-Pita, A. A. Castrejón-Pita and G. Huelsz. “Particle image velocimetry of the instable capillary flow of a micellar solution”, J. Rheology, 47 1455 (2003). 
• J. R. Castrejón-Pita, A. del Río, A. A. Castrejón-Pita and G. Huelsz. “Experimental observation of dramatic differences in the dynamic response of Newtonian and Maxwellian fluids”, Physical Review E, 68 046301 (2003). 
• J. R. Castrejón-Pita, A. A. Castrejón-Pita, A. Sarmiento-Galán and R. Castrejón-García. “Nasca Lines: A mystery wrapped in a enigma”, Chaos, 13 836 (2003).
• R. Castrejón-García, A. Sarmiento-Galán, J. R. Castrejón-Pita and A. A. Castrejón-Pita, “The fractal dimension of an oil spray”, Fractals, 11 155 (2003).
• A. A. Castrejón-Pita, J. R. Castrejón-Pita, and G. Huelsz. “Structured and Fractals Patterns in a simple cavity”, Fractals, 11(2) 169 (2003). (COVER). 

Submitted

• J. R. Castrejon-Pita, K. J. Kubiak, A. A. Castrejon-Pita, M. C. T. Wilson, and I. M. Hutchings, Mixing and internal dynamics of impacting and coalescing droplets.  (2013)