Ing. Tomáš Juřena, Ph.D.
E-mail:   Tomas.Jurena@vutbr.cz  Dept.:   Institute of Process Engineering Dept. of Process Engineering Position:   Assistant Professor Room:   D5/443

Publications:

• STROUHAL, J.; JUŘENA, T.; JEGLA, Z.:
  Fouling Simulations of a Passive Part of the Testing Combustion Facility, AIDIC Servizi Srl
  journal article in Scopus
• STROUHAL, J.; JUŘENA, T.; JEGLA, Z.:
  Analysis of influence of model input parameters on ash fouling rate predicted by CFD,
  Engineering Mechanics 2020, pp.468-471, ISBN 978-80-214-5896-3, (2020), Brno University of Technology, Institute of Solid Mechanics, Mechatronics and Biomechanics
  conference paper
  akce: Engineering Mechanics 2020, Online, 24.11.2020-25.11.2020
• JUŘENA, T.; VONDÁL, J.; REBEJ, M.; JEGLA, Z.:
  EULERIAN TRACKING OF CUMULATIVE LIGHT DOSE IN MICROALGAL PHOTOBIOREACTOR,
  Engineering Mechanics 2020, pp.254-257, ISBN 978-80-214-5896-3, (2020), BRNO UNIV TECHNOL, FAC MECHANICAL ENGINEERING
  conference paper
  akce: Engineering Mechanics 2020, Online, 24.11.2020-25.11.2020
• JUŘENA, T.; HÁJEK, J.; REBEJ, M.; VONDÁL, J.:
  Jak se daří mikrořasám v CFD modelech fotobioreaktorů?
  lecture
• JUŘENA, T.; HÁJEK, J.; VONDÁL, J.:
  Fluid dynamics of stirred photobioreactor cuvette,
  Book of Abstracts of 12th European Congress of Chemical Engineering and 5th European Congress of Applied Biotechnology, pp.1549-1550, ISBN 978-88-95608-75-4, (2019), AIDIC Servizi SRL
  abstract
• HÁJEK, J.; VONDÁL, J.; JUŘENA, T.; SLÁMA, J.:
  What the Combustion Engineer Gains from CFD Modeling: Gas Furnace, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
  journal article in Web of Science
• MÁŠA, V.; LOŠÁK, P.; BRUMMER, V.; JUŘENA, T.; PERNICA, M.:
  Vývoj technologické linky na zpracování vaječných skořápek
  summary research report - contract. research
• HÁJEK, J.; JEGLA, Z.; JUŘENA, T.:
  Analýza zanášení fluidních kotlů
  summary research report - contract. research
• JUŘENA, T.; HÁJEK, J.:
  Simulace spalovacího procesu v podmínkách, které vychází z rozměrů normovaného kontejneru, k stanovení optimálního tvaru komory a způsobu usměrnění toku spalin do kotle tak, aby byly zaručeny konstantní procesní podmínky
  report
• SKRYJA, P.; BĚLOHRADSKÝ, P.; JUŘENA, T.; HUDÁK, I.; KRČÁL, P.; VÍTEK, L.; ŠŤÁVA, R.:
  Technická zpráva o CFD modelování proudění a spalování v navrženém prototypu kombinovaného nízkoemisního hořáku
  report
• JUŘENA, T.; DOHNAL, M.; HÁJEK, J.:
  Simulation of Multiphase Flow in Stirred Tank of Nonstandard Design,
  Chemical Engineering Transactions, pp.625-630, ISBN 978-88-95608-51-8, (2017), Aidic Servizi, S.r.l.
  conference paper
  akce: 20th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES17), Tianjin, 21.08.2017-24.08.2017
• MÁŠA, V.; BRUMMER, V.; LOŠÁK, P.; JUŘENA, T.; NAĎ, M.; DOHNAL, M.:
  Inovace technologické linky pro zpracování vaječných skořápek
  summary research report - contract. research
• JUŘENA, T.; BĚLOHRADSKÝ, P.; SKRYJA, P.; HUDÁK, I.:
  Numerical Modelling of Combustion in 1.5 Mw Low-nox Burner,
  Chemical Engineering Transactions, pp.1261-1266, ISBN 978-88-95608-42-6, (2016), Aidic Servizi, S.r.l.
  conference paper
  akce: 19th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES 2016), Praha, 27.08.2016-31.08.2016
• JUŘENA, T.:
  Dokumentace k výpočtovému software pro simulaci roštového spalování, VUT v Brně, Fakulta strojního inženýrství, Ústav procesního inženýrství
  report
• HÁJEK, J.; JUŘENA, T.:
  New Numerical Treatment of Source Term in Convective Transfer of Heat between Fluid and Porous Solid Matrix, Emerald Group Publishing
  journal article in Web of Science
• SKRYJA, P.; BĚLOHRADSKÝ, P.; HUDÁK, I.; JUŘENA, T.:
  Experimental Study on NOx Formation in Gas-staged Burner ,
  Proceedings of the 18th International Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES 2015), pp.997-1002, ISBN 978-88-95608-36-5, (2015), Aidic Servizi S.r.l.
  conference paper
  akce: 18th International Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES’15), Kuching, 23.08.2015-27.08.2015
• HÁJEK, J.; JUŘENA, T.; BAIER, B.; BAGHERZADEH, A.; SCHNICK, T.; SMEJKAL, Q.:
  CFD Process Modeling of Industrial Calcination of Diatomite, WILEY-VCH Verlag GmbH & Co. KGaA
  journal article in Web of Science
• JUŘENA, T.; HÁJEK, J.:
  CFD calculation of design variants of a flow regulator valve
  summary research report - contract. research
• JUŘENA, T.:
  CFD analýza mísení dvou kapalin v potrubí s homogenizačním elementem
  summary research report - contract. research
• BRUMMER, V.; SKRYJA, P.; JUŘENA, T.; HLAVÁČEK, V.; STEHLÍK, P.:
  Suitable Technological Conditions for Enzymatic Hydrolysis of Waste Paper by Novozymes Enzymes NS50013 and NS50010, Springer Science + Business Media
  journal article in Web of Science
• JUŘENA, T.; HÁJEK, J.:
  Effects of convergence criteria on mass and energy balance of packed-bed combustion model,
  Third International Conference on Computational Methods for Thermal Problems, pp.245-248, ISBN 978-88-7431-727-1, (2014), Giannini Editore
  conference paper
  akce: Third International Conference on Computational Methods for Thermal Problems, Lake Bled, 02.06.2014-04.06.2014
• BRUMMER, V.; JUŘENA, T.; HLAVÁČEK, V.; OMELKOVÁ, J.; BÉBAR, L.; GABRIEL, P.; STEHLÍK, P.:
  Enzymatic hydrolysis of pretreated waste paper – Source of raw material for production of liquid biofuels, Elsevier Ltd.
  journal article in Web of Science
• HÁJEK, J.; JUŘENA, T.:
  Simulation of flow in a calciner model
  summary research report - contract. research
• JUŘENA, T.; BROUKAL, J.:
  Review on validation of CFD models of swirling flows by experimental data,
  Sborník CHISA 2013, Plné texty příspěvků, pp.P30-1-P30-8, ISBN 978-80-02-02500-9, (2013), ČSCHI
  conference paper
  akce: 60. konference chemického a procesního inženýrství, Srní, 14.10.2013-17.10.2013
• HÁJEK, J.; JEGLA, Z.; VONDÁL, J.; JUŘENA, T.; BROUKAL, J.:
  CFD simulace spalování plynu v peci 2511-H01/1
  summary research report - contract. research
• HÁJEK, J.; JUŘENA, T.:
  Modelling of 1MW Solid Biomass Combustor: Simplified Balance-Based Bed Model Coupled with Freeboard CFD Simulation,
  Chemical Engineering Transactions, Vol.29, (2012), No.1, pp.745-750, ISSN 1974-9791, AIDIC Servizi S.r.l.
  journal article - other
• JUŘENA, T.; HÁJEK, J.; KROPÁČ, J.:
  Physical and chemical properties of biomass for CFD modelling of grate combustion,
  Sborník CHISA 2011, pp.1-12, ISBN 978-80-905035-0-2, (2011), Česká společnost chemického inženýrství
  conference paper
  akce: 58. konference chemického a procesního inženýrství, Chisa 2011, Srní, 24.10.2011-27.10.2011
• JUŘENA, T.; HÁJEK, J.:
  Note on convergence criteria for energy and mass in CFD model of fixed-bed combustion,
  MCS-7 Seventh Mediterranean Combustion Symposium - Proceedings, pp.223, ISBN 978-88-88104-12-6, (2011), Associazione Sezione Italiana del Combustion Institute
  abstract
  akce: 7th Mediterranean Combustion Symposium, Chia Laguna Conference Center, Domus de Maria, Sardinie, 11.09.2011-15.09.2011
• JUŘENA, T.; HÁJEK, J.:
  Energy Considerations in CFD Modelling of Biomass Combustion in an Experimental Fixed-bed Reactor,
  Chemical Engineering Transactions, Vol.25, (2011), No.2, pp.803-808, ISSN 1974-9791, AIDIC Servizi S.r.l.
  journal article - other
• JUŘENA, T.; HÁJEK, J.:
  Mathematical modelling of biomass combustion: packing conditions issues,
  Chemical Engineering Transactions, Vol.21, (2010), No.2, pp.1105-1110, ISSN 1974-9791, AIDIC Servizi S.r.l.
  journal article - other
• JUŘENA, T.; HÁJEK, J.:
  Computational system for CFD simulation of drying and devolatilization of biomass in 1D experimental fixed bed reactor,
  56. konference chemického a procesního inženýrství CHISA 2009 (sborník příspěvků), pp.A4.8-A4.8, ISBN 978-80-86059-51-8, (2009), Česká společnost chemického inženýrství
  conference paper
  akce: 56. konference chemického a procesního inženýrství CHISA 2009, Srní, 19.10.2009-22.10.2009
• JUŘENA, T.; RECMAN, M.; HÁJEK, J.:
  Simulation of biomass drying in fixed bed of experimental grate combustion reactor,
  Chemical Engineering Transactions, Vol.18, (2009), No.1, pp.599-604, ISSN 1974-9791
  journal article - other

List of publications at Portal BUT

Abstracts of most important papers:

• HÁJEK, J.; VONDÁL, J.; JUŘENA, T.; SLÁMA, J.:
  What the Combustion Engineer Gains from CFD Modeling: Gas Furnace, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
  journal article in Web of Science
  Combustion engineers require correct predictions of trends, especially in cases when computational fluid dynamics is applied for troubleshooting, scale-up, or decision support in the design phase. Validation of models by parametric studies and in a large-scale furnace is rare and much needed. This is the primary objective of this work. Similarly, combustion engineers require the prediction of heat loads in specific parts of a boiler or furnace. The second objective of this work is to provide exactly such type of validation for a megawatt-scale burner. Both cases use natural gas fuel. The models applied to perform the predictions are typical of practicing combustion engineers, providing fast turnaround times. The results provide a perspective on the performance of models serving as workhorses in engineering companies.
• JUŘENA, T.; BĚLOHRADSKÝ, P.; SKRYJA, P.; HUDÁK, I.:
  Numerical Modelling of Combustion in 1.5 Mw Low-nox Burner,
  Chemical Engineering Transactions, pp.1261-1266, ISBN 978-88-95608-42-6, (2016), Aidic Servizi, S.r.l.
  conference paper
  akce: 19th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES 2016), Praha, 27.08.2016-31.08.2016
  Results from CFD simulations of swirling non-premixed gas flame using a low-NOx gas burner are presented and compared to experimental data measured during a testing campaign in a semi-industrial water-cooled combustion chamber. It is shown, how results are sensitive to the mixing rate constant of EDM, which is employed in a simulation of swirling turbulent diffusion flame. Specifically, temperatures are overestimated with the constant being set to 4 (the default value in Ansys Fluent), which leads to false prediction of NOx formation. Temperature peaks are reduced by lowering the mixing rate constant. An acceptable agreement with measured outlet and peak flame temperatures is achieved, when the constant is set to 0.6. With this value, however, highly increased concentrations of unburned species are reported at the outlet. Predicted values deviate from the measurements about three orders of magnitude. Based on the concentrations of unburned species and oxygen in the flue gas at the outlet, the best results are obtained with the constant 1.2.
• HÁJEK, J.; JUŘENA, T.:
  New Numerical Treatment of Source Term in Convective Transfer of Heat between Fluid and Porous Solid Matrix, Emerald Group Publishing
  journal article in Web of Science
  This paper reports a novel formulation of convective heat transfer source term for the case of flow through porous medium. The new approximation is shown to provide superior performance over standard explicit and implicit formulations. The novel formulation is obtained by analytical solution of an idealized dual problem. Computations are performed by dedicated tool for fixed bed combustion named GRATECAL and developed by the authors. However, the proposed method can also be applied to other porous media flow problems. The new source term formulation is unconditionally stable and it respects exponential decay of temperature difference between the fluid and porous solid medium. The results of this work are applicable in the simulation of convective heat transfer between the fluid and porous medium. Applications include e.g. fixed bed combustion, catalytic reactors and lime kilns. The reported solution is believed to be original. It will be useful to all involved in numerical simulations of fluid flow in porous media with convective heat transfer.
• SKRYJA, P.; BĚLOHRADSKÝ, P.; HUDÁK, I.; JUŘENA, T.:
  Experimental Study on NOx Formation in Gas-staged Burner ,
  Proceedings of the 18th International Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES 2015), pp.997-1002, ISBN 978-88-95608-36-5, (2015), Aidic Servizi S.r.l.
  conference paper
  akce: 18th International Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES’15), Kuching, 23.08.2015-27.08.2015
  The main aim of research was investigation of combustion operating parameters and burner’s constructional parameters on the formation of nitrogen oxides. The tests were performed using the burner prototype with the maximal capacity of 1.5 MW. The burner is both fuel-staged and air-staged. During the testing campaign, various geometries of secondary nozzles and their position towards the burner quarl, and various geometries of the so-called swirl generator were investigated.
• HÁJEK, J.; JUŘENA, T.; BAIER, B.; BAGHERZADEH, A.; SCHNICK, T.; SMEJKAL, Q.:
  CFD Process Modeling of Industrial Calcination of Diatomite, WILEY-VCH Verlag GmbH & Co. KGaA
  journal article in Web of Science
  Calcination of diatomite is an expensive process frequently resulting in products with unpredictable structure. Alternatively, calcination in swirling flow is an energy-saving option. Computational fluid dynamics modeling of an experimental calcination process unit is presented. Experimental results and systematic collection of process data were used to define boundary condition for steady-state and transient simulation runs. The comparison of experimental and simulation results shows the complexity of the calcination process. The results can be used for further process optimization.