Recent Submissions

  • Research of Flow Stability of Non-Newtonian Magnetorheological Fluid Flow in the Gap between Two Cylinders 

    Kozubková, Milada; Jablonská, Jana; Bojko, Marian; Pochylý, František; Fialová, Simona (MDPI, 2021-10-15)
    This paper deals with a mathematical modeling of flow stability of Newtonian and non-Newtonian fluids in the gap between two concentric cylinders, one of which rotates. A typical feature of the flow is the formation of a ...
  • Optimalization of afterburner channel in biomass boiler using CFD analysis 

    Pospíšil, Jiří; Lisý, Martin; Špiláček, Michal (Czech Technical University in Prague, 2016-10-31)
    This contribution presents the results of parametrical studies focused on the mixing process in a small rectangular duct within a biomass boiler. The first study investigates the influence of a local narrowing located in ...
  • A liquid interaction with ultrahydrophobic surfaces 

    Jašíková, Darina; Kotek, Michal; Fialová, Simona; Kopecký, Václav (EDP Sciences, 2016-03-28)
    The interaction of the liquid with ultra-hydrophobic surfaces was so far studied through estimation of static contact angles. It appears now that this interaction is more complex, and cannot be described only with static ...
  • Parameters Influencing the Emission of Ultrafine Particles during 3D Printing 

    Chýlek, Radomír; Kudela, Libor; Pospíšil, Jiří; Šnajdárek, Ladislav (MDPI, 2021-11-06)
    This paper presents a complex and extensive experimental evaluation of fine particle emissions released by an FDM 3D printer for four of the most common printing materials (ABS, PLA, PET-G, and TPU). These thermoplastic ...
  • Constitutive Equations for Magnetic Active Liquids 

    Fialová, Simona; Pochylý, František (MDPI, 2021-10-11)
    This article is focused on the derivation of constitutive equations for magnetic liquids. The results can be used for both ferromagnetic and magnetorheological fluids after the introduced simplifications. The formulation ...
  • Technical and economic optimization of cogeneration technology using combustion and gasification 

    Lisý, Martin; Baláš, Marek; Špiláček, Michal; Skála, Zdeněk (Czech Technical University in Prague, 2014-02-28)
    This paper presents the technical and economic optimization of new microcogeneration technology with biomass combustion or biomass gasification used for cogeneration of electrical energy and heat for a 200 kW unit. During ...
  • Size analysis of solid particles at the experimental device for multi-stage biomass combustion 

    Hrnčířová, Michaela; Špiláček, Michal; Pospíšil, Jiří (Czech Technical University in Prague, 2014-02-28)
    This paper presents the results of an analysis of ash content particles produced in biomass combustion at an experimental device. The main parts of the device are: the water heater, the gasifying chamber, the air preheater, ...
  • Automatic biomass boiler with an external thermoelectric generator 

    Brázdil, Marian; Šnajdárek, Ladislav; Kracík, Petr; Pospíšil, Jiří (Czech Technical University in Prague, 2014-02-23)
    Abstract. This paper presents the design and test results of an external thermoelectric generator that utilizes the waste heat from a small-scale domestic biomass boiler with nominal rated heat output of 25 kW. The ...
  • Comparison of two methods of mathematical modeling in hydrodynamic sealing gap 

    Krutil, Jaroslav; Fojtášek, Kamil; Dvořák, Lukáš (EDP Sciences, 2015-05-06)
    The aim of work is to compare two possible methods of mathematical modeling of hydrodynamic instabilities. This comparison is performed by monitoring the formation and evolution of Taylor vortices in hydrodynamic sealing ...
  • Numerical simulation of pump-intake vortices 

    Rudolf, Pavel; Klas, Roman (EDP Sciences, 2015-05-06)
    Pump pre-swirl or uneven flow distribution in front of the pump can induce pump-intake vortices. These phenomena result in blockage of the impeller suction space, deterioration of efficiency, drop of head curve and earlier ...
  • Numerical simulation and experimental visualization of the separated cavitating boundary layer over NACA2412 

    Kozák, Jiří; Rudolf, Pavel; Sedlář, Milan; Habán, Vladimír; Hudec, Martin; Huzlík, Rostislav (EDP Sciences, 2015-05-06)
    Cavitation is physical phenomenon of crucial impact on the operation range and service lifetime of the hydraulic machines (pumps, turbines, valves etc.). Experimental measurement of cavitation is expensive and time consuming ...
  • Experimental Verification of the Use of Ultra Hydrophobic Materials for Water Aeration 

    Fialová, Simona; Hudec, Martin; Pochylý, František; Gašič, Maja; Ivanová, Simona (OMICS Internacional, 2015-11-09)
    The paper introduces a new aeration technology for stationary tanks with water mass. It is a passive aeration based on the principle of air diffusion, or more precisely oxygen diffusion into water. It uses the principles ...
  • Vibrations of hydraulic pump and their solution 

    Dobšáková, Lenka; Nováková, Naděžda; Habán, Vladimír; Hudec, Martin; Jandourek, Pavel (EDP Sciences, 2017-05-12)
    The vibrations of hydraulic pump and connected pipeline system are very problematic and often hardly soluble. The high pressure pulsations of hydraulic pump with the double suction inlet are investigated. For that reason ...
  • Calculation of stress and deformation in fuel rod cladding during pellet-cladding interaction 

    Halabuk, Dávid; Martinec, Jiří (Czech Technical University in Prague, 2015-12-18)
    The elementary parts of every fuel assembly, and thus of the reactor core, are fuel rods. The main function of cladding is hermetic separation of nuclear fuel from coolant. The fuel rod works in very specific and difficult ...
  • Dispersion of Pollutants from Line Sources in Small Municipalities 

    Pospíšil, Jiří; Huzlík, Jiří; Ličbinský, Roman (Palacký University in Olomouc, 2014-12-01)
    The article deals with the issue of dispersion and spreading of pollutants in small municipalities. The main attention is paid to the spreading of pollutants from line sources, i.e. roads in this case. Numerical modelling ...
  • FINE AND ULTRA FINE PARTICLES FORMED DURING THE BIOMASS COMBUSTION IN SMALL COMBUSTION DEVICES 

    Poláčik, Ján; Schüllerová, Barbora; Pospíšil, Jiří; Adamec, Vladimír (2020-04-01)
    Currently, more and more emphasis is placed on improving the air quality and promoting alternative methods of household heating, including the use of biomass. Although these combustion processes are considered to be ...
  • Validation of ISO 9920 clothing item insulation summation method based on an ambulance personnel clothing system 

    Kuklane, Kalev; Toma, Róbert (National Institute of Occupational Safety and Health, 2021-02-26)
    This study aimed to validate the summation methods suggested by ISO 9920. Twenty seven items from an ambulance personnel clothing system were selected for testing. The basic insulation of each garment item (Iclu) was ...
  • Small Cogeneration Unit with Heat and Electricity Storage 

    Štětina, Josef; Březina, Michal; Böhm, Michael (MDPI, 2021-04-09)
    A micro cogeneration unit based on a three-cylinder internal combustion engine, Skoda MPI 1.0 L compressed natural gas (CNG), with an output of 25 kW at 3000 RPM is proposed in this paper. It is a relatively simple engine, ...
  • A New Formulation of Maxwell’s Equations 

    Fialová, Simona; Pochylý, František (MDPI, 2021-05-12)
    In this paper, new forms of Maxwell’s equations in vector and scalar variants are presented. The new forms are based on the use of Gauss’s theorem for magnetic induction and electrical induction. The equations are formulated ...
  • Comparison of optimization-regulation algorithms for secondary cooling in continuous steel casting 

    Březina, Michal; Mauder, Tomáš; Klimeš, Lubomír; Štětina, Josef (MDPI, 2021-02-01)
    The paper presents the comparison of optimization-regulation algorithms applied to secondary cooling zone in continuous steel casting where the semi-product withdraws most of its thermal energy. In steel production, ...

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