Spray research laboratory

The workplace has 25 year hands-on experience in the field of atomizers. It runs a laboratory unique to the Czech Republic that is equipped competitively with other top laboratories across Europe.The typical application lies in research and diagnostics of atomizers for energy industry, combustion chambers of gas turbine engines, gas cleaning (desulphurization, CCS), cooling in metallurgic processes, combustion of waste fuels, pharmaceutical industry and air humidification.

The laboratory equipment enables nozzle testing in a wide range of operating pressures, flow rates, and fluid types with complex measurement of their properties: flow characteristics, internal flow, time/frequency and space resolved size characteristics, droplet speed and concentration in the spray, mass flow rate of the liquid, spray geometry. Realistic conditions of sprays and other two-phase dispersion systems in various applications are investigated in a flowing environment in a wind tunnel or with heating/cooling of the spray liquid.

Photos and video gallery here

Activities carried out

  • Research, development and testing of various type atomizers, injectors and nebulizers
  • Design of pressure and twin-fluid effervescent nozzles based on in-house methodology, design of atomizers for high viscosity liquids, waste fuels and suspensions of solid particles
  • Measurement of spray properties employing advanced diagnostics methods as the input data for CFD simulations
  • Visualization of nozzle internal flow and research into two-phase flow
  • Solution to two-phase discharge flow (liquid-gas) using an in-house code
  • Spray stability assessment using in-house developed methods along with the published ones

Video: Measurement of spray properties of Slinger atomizer

Video: Comparison of experimental and numerical approach for internal flow simulation of Simplex atomizer

Laboratory instruments

Video and photo gallery


  • První brněnská strojírna Velká Bíteš, a.s., (fuel atomizers for smallturbine engines) (1999–2000, 2011-2012, 2014, 2018, 2019)
  • EKOL spol. s r.o. (Design concept of a steam aftercooler) (2014)
  • Philip Morris Products S.A. (Flow field and aerosol deposition in casts of a human respiratory tract) (2014–2015)
  • MVB OPAVA CZ s.r.o.: Vizualization of water splashing in a scrubber (in the frame of project TH01030820 Complex reduction of gaseous pollutants emission from the small scale units) (2015)
  • Provyko s.r.o.: Measurement and analysis of vibration cause in the airduct in heating plant Tepláreň Košice, a. s, SK  (2016)
  • ViskoTeepak s.r.o.: Analysis of working process of machines using high-speed camera (2016)
  • VZLÚ: Design of a test facility for fuel nozzles, (SR13757047) (2017)
  • Czech University of Life Sciences Prague: Measurement and analysis of flow velocity inside mulch-laying machine (HS13657214) (2016)
  • SÚJCHBO (SR13757211) (2017)
  • Honeywell, Ltd.: Mixing of air stream with gas in front of burner, (SR13757110) (2017)
  • SÚJCHBO: Verification of PortaCount Counter Sensitivity, (SR13757211) (2017)
  • Tenza a.s .: Assessment of spray quality ... (2018)
  • ZVVZ: Design of smoke cooling solution with fly ash (2018)
  • Skala Medica: Assessment of cytostatic spray nozzles, Risk analysis (2020)
  • BALÓNY KUBÍČEK spol. s r.o .: Ignis + balloon burner innovation (2020)
  • SVS FEM: Design of nozzles for flue gas humidification (Ledvice Power Plant, 2020)

Related publications

  • JEDELSKÝ, J.; JÍCHA, M. Spray characteristics and liquid distribution of multi- hole effervescent atomisers for industrial burners. Applied Thermal Engineering, 2016, vol. 2016, no. 96, p. 286-296. ISSN: 1359-4311.
  • András Urbán, Matouš Zaremba, Milan Malý, Viktor Józsa, Jan Jedelský, Droplet dynamics and characterization of high-velocity airblast atomization, International Journal of Multiphase Flow, International Journal of Multiphase Flow, Volume 95, October 2017, Pages 1–11
  • Matouš Zaremba, Lukas Weiß, Milan Malý, Michael Wensing, Jan Jedelský, Miroslav Jícha. Low-pressure twin-fluid atomization: Effect of mixing process on spray formation. INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, 2017, vol. 89, no. 1, p. 277-289. ISSN: 0301-9322.
  • JEDELSKÝ, J.; MALÝ, M.; DEL CORRAL, N.; WIGLEY, G.; JANÁČKOVÁ, L.; JÍCHA, M. AIR–LIQUID INTERACTIONS IN A PRESSURE-SWIRL SPRAY. International journal of heat and mass transfer, 2018, vol. 1, no. 1, p. 788-804. ISSN: 0017-9310.
  • ZAREMBA, M.; KOZÁK, J.; MALÝ, M.; WEISS, L.; RUDOLF, P.; JEDELSKÝ, J.; JÍCHA, M. An Experimental Analysis of the Spraying Processes in Improved Design of Effervescent Atomizer. INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, 2018, no. 103, p. 805-814.
  • MALÝ, M.; JEDELSKÝ, J.; SLÁMA, J.; JANÁČKOVÁ, L.; SAPÍK, M.; WIGLEY, G.; JÍCHA, M. Internal flow and air core dynamics in Simplex and Spill-return pressure-swirl atomizers. International journal of heat and mass transfer, 2018, vol. 123, no. 1, p. 805-814.
  • MALÝ, M.; MOITA, A. S.; JEDELSKÝ, J.; RIBEIRO A. P. C.; MOREITA A. L. N. Effect of nanoparticles concentration on the characteristics of nanofluid sprays for cooling applications. Journal of Thermal Analysis and Calorimetry, 2019, vol. 135, no. 6, p. 3375-3386.
  • URBÁN, A.; MALÝ, M.; JÓZSA, V.; JEDELSKÝ, J. Effect of liquid preheating on high-velocity airblast atomization: From water to crude rapeseed oil. EXPERIMENTAL THERMAL AND FLUID SCIENCE, 2019, vol. 102, no. 1, p. 137-151.
  • MALÝ, M.; SAPÍK, M.; CEJPEK, O.; WIGLEY, G.; KATOLICKÝ, J.; JEDELSKÝ, J. Effect of spill orifice geometry on spray and control characteristics of spill-return pressure-swirl atomizers. EXPERIMENTAL THERMAL AND FLUID SCIENCE, 2019, vol. 106, no. 1, p. 159-170
  • URBÁN, A.; GRONIEWSKI, A.; MALÝ, M.; JÓZSA, V.; JEDELSKÝ, J, Application of big data analysis technique on high-velocity airblast atomization: searching for optimum probability density function. FUEL, 2020, vol. 273, no. 1, p. 1-12. ISSN: 0016-2361. August 2020, https://doi.org/10.1016/j.fuel.2020.117792
  • Farid A. Hammad, Kai Sun, Jan Jedelsky, Tianyou Wang, The Effect of Geometrical, Operational, Mixing Methods, and Rheological Parameters on Discharge Coefficients of Internal‐Mixing Twin‐Fluid Atomizers, Processes 2020, 8, 563; doi:10.3390/pr805056
  • András Urbán; Bálint Katona; Milan Malý; Jan Jedelský; Viktor Józsa, Empirical correlation for spray half cone angle in plain-jet airblast atomizers, FUEL, 2020, vol. 277, no. 1, p. 1-11. ISSN: 0016-2361, Ref: JFUE-D-20-01328, Article Type: VSI:Clean Air 2019
  • MALÝ, M.; CEJPEK, O.; SAPÍK, M.; ONDRÁČEK, V.; WIGLEY, G.; JEDELSKÝ, J. Internal flow dynamics of spill-return pressure-swirl atomizers. EXPERIMENTAL THERMAL AND FLUID SCIENCE, 2021, vol. 120, no. 1, p. 1-13. ISSN: 0894-1777. https://doi.org/10.1016/j.expthermflusci.2020.110210
  • Marek Mlkvik, Jan Jedelsky, Heike P. Karbstein, Volker Gaukel, Spraying of viscous liquids: influence of the fluids mixing mechanism on the performance of the internal-mixing twin fluid atomizers, Applied Sciences
  • Jan Jedelský, Milan Malý, Jaroslav Sláma, Miroslav Jícha, Graham Wigley, "Importance of Geometrical Factors on Spray Characteristics of Spill-Return Atomizers" AIAA Journal (2020), accessed November 24, 2020. doi: 10.2514/1.B38066
  • Farid A. Hammad, Kai Sun, Zhizhao Che, Jan Jedelsky, Tianyou Wang, Internal two-phase flow and spray characteristics of outside-in-liquid twin-fluid atomizers, Applied Thermal Engineering:116555 (2021) http://dx.doi.org/10.1016/j.applthermaleng.2021.116555

Related Outputs

  • Jícha M., Jedelský J., Sláma J., Vysoké učení technické v Brně: Dvoumédiová effervescent tryska. 298870, patent. Úřad průmyslového vlastnictví v Praze (2008)
  • Jedelský J., Jícha M., Sláma J., Vysoké učení technické v Brně: Třímédiová tryska. reg. n. CZ 296739 B6, patent. Úřad průmyslového vlastnictví v Praze (2006)
  • In-house software pro problémy dvoufázového proudění


  • Budapest University of Technology and Economics, Hungary (Dr. Józsa)
  • Lund University, Division of Combustion Physics, Sweden (Dr. Berrocal)
  • Lodz University of Technology (PL), Faculty of Process and Environmental Engineering (dr. Gladyszewski and prof. Górak)
  • Indian Institute of Technology Tirupati (Dr. Madan Mohan Avulapati)
  • Instituto Superior Técnico, Universidade de Lisboa, Portugal (dr. Moita)
  • Karlsruhe Institute of Technology (KIT), Německo
  • Loughborough University, UK
  • Erlangen Universitaet, Německo

Contact person

prof. Ing. Jan Jedelský, Ph.D.
Energy Institute, FME BUT
e-mail: jedelsky@fme.vutbr.cz
tel.: +420 541 143 266