I've always been fascinated by the exact sciences, physics, chemistry, and mathematics. The symmetry of phenomena in nature and our description of them in the form of fundamental laws are beautiful and awesome. I did my Master's degree in Chemical Technology at Delft University of Technology and received my PhD-degree (with honours) in Applied Physics at that same university. I specialized in transport phenomena and turbulence, focusing in particular on the experimental investigation of it. I used particle image velocimetry (PIV) and laser Doppler anemometry (LDA) to measure flow velocities in turbulent air jets, and liquid crystal thermography (LCT) and infrared thermography (IRT) to measure temperature distributions on surfaces. For those interested, my thesis entitled Multiple Impinging Jet Arrays: An Experimental Study on Flow and Heat Transfer can be downloaded from the repository of Delft University. Currently I work as a research scientist at the Netherlands Organization of Applied Scientific Research TNO. A list of my publications can be found on my LinkedIn profile and in a list below.

Already from a young age I started tinkering with electronics and computers. Starting with the repair of my grandpa's radio and learning the basics with Phillips electronic building kits, I went on to integrated circuits and Atmel AVR microcontrollers. Computer programming started with Basic on a ZX spectrum 128k and an Atari STfm. Later on I learned to program in Pascal, Fortran, Delphi, C, C++, and Java on PCs, currently I mainly program in C++. I did so many projects during the years, some failed, some worked, some were useless, some useful, some burnt my fingers, others only my money, but always they were fun. On my site you will find some of the projects I did with an explanation of how I did it. Most of my information I got off the Internet from fellow tinkerers who gladly donated their knowledge to the community. Because I am a firm believer of shared research and open innovation, consider this my contribution to the community. I hope people will enjoy the projects and learn from them, as I have from the projects of others.

Leon Geers


  • G.C.J. Bart, A.J. van IJzerloo, L.F.G. Geers, L. Hoek, K. Hanjalic, “Heat transfer of phase-locked modulated impinging jet arrays”, Exp. Thermal Fluid Sci. 2002, vol. 26, no. 2-4, pp. 299-304.
  • L.F.G. Geers, M.J. Tummers, K. Hanjalic, “Experimental investigation of impinging jet arrays”, Exp. Fluids 2004, vol. 36, no. 6, pp. 946-958.
  • L.F.G. Geers, M.J. Tummers, K. Hanjalic, “Particle imaging velocimetry-based identification of coherent structures in normally impinging multiple jets”, Phys. Fluids 2005, vol. 17, paper no. 055105.
  • L.F.G. Geers, M.J. Tummers, K. Hanjalic, “Wall imprint of turbulent structures and heat transfer in multiple impinging jet arrays”, J. Fluid Mech. 2006, vol. 546, pp. 255-284.
  • L.F.G. Geers, M.J. Tummers, T.J. Bueninck, K. Hanjalic, “Heat transfer correlation for hexagonal and inline arrays of impinging jets”, Int. J. Heat Mass Transfer 2008, vol. 51, no. 21-22, pp. 5389-5399.
  • L.F.G. Geers, A. Volker, T.P.M. Hunter, “A liquid-independent volume flow measurement principle”, Meas. Sci. Technol. 2010, vol. 21, no. 7, paper no. 074001.
  • L.F.G. Geers, A. van de Runstraat, R. Joh, R. Schneider, E.L.V. Goetheer, “Development of an on-line monitoring method of a CO2 capture process”, Ind. Eng. Chem. Res. 2011, vol. 50, no. 15, 9175-9180.
  • L.V. van der Ham, D.E. Bakker, L.F.G. Geers, E.L.V. Goetheer, “Inline monitoring of CO2 absorption processes using simple analytical techniques and multivariate modeling”, Chem. Eng. Technol. 2014, vol. 37, no. 2, pp. 221-228.
  • A.C. van Eckeveld, L.V. van der Ham, L.F.G. Geers, L.J.P. van den Broeke, B.J. Boersma, E.L.V. Goetheer, “Online monitoring of the solvent and absorbed acid gas concentration in a CO2 capture process using monoethanolamine”, Ind. Eng. Chem. Res. 2014, vol. 53, no. 13, pp. 5515-5523.
  • A. Kachko, L.V. van der Ham, L.F.G. Geers, A. Huizinga, A. Rieder, M.R.M. Abu-Zahra, T.J.H. Vlugt, E.L.V. Goetheer, “Real-time process monitoring of CO2 capture by aqueous AMP-PZ using chemometrics: pilot plant demonstration”, Ind. Eng. Chem. Res. 2015, vol. 54, no. 21, pp. 5769-5776.



  • A.S. Lexmond, S.N.L. Donders, J.H.W. Jacobs, L.F.G. Geers, "Lithographic apparatus, metrology device, and a method of using the apparatus", US2010014060, Oct 2010
  • C.M. Rops, J.F.M. Velthuis, F. van der Graaf, L.F.G. Geers, "Multiple connected channel micro evaporator", US2011000624, Jan 2011
  • A.W.F. Volker, L.F.G. Geers, H. Blokland, T.P.M. Hunter, "Fluid flow meter using thermal tracers", US2011087447, Apr 2011
  • L.F.G. Geers, G. Pieterse, K. Polle, "Additive fabrication apparatus and method of layerwise production of a tangible object", WO2012053895, Dec 2013