Now showing items 1-20 of 98

  • 2D and 3D numerical modelling of internal flow of Pressure-swirl atomizer 

    Malý, Milan; Sláma, Jaroslav; Sapík, Marcel; Jedelský, Jan (EDP Sciences, 2019-06-28)
    This paper compares 2D axisymmetric and 3D numerical models used to predict the internal flow of a pressure-swirl atomizer using a commercial software Ansys Fluent 18.1. The computed results are compared with experimental ...
  • Air–liquid interactions in a pressure-swirl spray 

    Jedelský, Jan; Malý, Milan; Del Corral, Noé Pinto; Wigley, Graham; Janáčková, Lada; Jícha, Miroslav (Elsevier, 2018-01-02)
    The energy transfer between a liquid hollow cone spray and the surrounding air has been studied using both imaging and phase-Doppler techniques. The spray was produced by a pressure-swirl atomizer discharging Jet A-1 fuel ...
  • Analysis of fiber deposition using automatic image processing method 

    Bělka, Miloslav; Lízal, František; Jedelský, Jan; Jícha, Miroslav (EDP Sciences, 2013-04-09)
    Fibers are permanent threat for a human health. They have an ability to penetrate deeper in the human lung, deposit there and cause health hazards, e.g. lung cancer. An experiment was carried out to gain more data about ...
  • Aplikace VR kamery na problémy mechaniky tekutin 

    Bolcek, Adam
    Práce se zabývá metodami vizualizací kapalin a plynů a jejich zaznamenáním pomocí vysoko-rychlostní kamery. V první části je stručně uvedeno rozdělení VR kamer podle principu činnosti. Dále pak popis kamery Olympus i-SPEED ...
  • Application of big data analysis technique on high-velocity airblast atomization: Searching for optimum probability density function 

    Urbán, András; Groniewski, Axel; Malý, Milan; Józsa, Viktor; Jedelský, Jan (Elsevier, 2020-08-01)
    In this paper, the droplet size distributions of high-velocity airblast atomization were analyzed. The spray measurement was performed by a Phase-Doppler anemometer at several points and different diameters across the spray ...
  • Application of Positron Emission Tomography to Aerosol Transport Research in a Model of Human Lungs 

    Lízal, František; Jedelský, Jan; Adam, Jan; Bělka, Miloslav; Jícha, Miroslav (EDP Sciences, 2013-04-09)
    Positron Emission Tomography (PET) is a convenient method for measurement of aerosol deposition in complex models of lungs. It allows not only the evaluation of regional deposition characteristics but also precisely detects ...
  • Character of the cavitation erosion on selected metallic materials 

    Mlkvik, Marek; Olšiak, Róbert; Knížat, Branislav; Jedelský, Jan (EDP Sciences, 2013-11-22)
    Proposed article dealing with the analysis of the type of the damage caused by the cavitation erosion according to the selected metallic material of the specimen. As is shown in the article, the type of the damage has a ...
  • Characteristics of droplet motion in effervescent sprays 

    Jedelský, Jan; Zaremba, Matouš; Malý, Milan; Jícha, Miroslav (EDP Sciences, 2014-03-25)
    Time resolved droplet size and velocity measurement was made using Phase-Doppler anemometry in an effervescent spray at GLR of 6 % and operation pressure drops 21 – 52 kPa. The spray shows a size dependent variation of ...
  • Characteristics of Turbulent Particle Transport in Human Airways under Steady and Cyclic Flows 

    Jedelský, Jan; Lízal, František; Jícha, Miroslav (Elsevier, 2012-06-15)
    Motion of monodispersed micron-sized particles suspended in air flow was studied on transparent model of human airways using Phase-Doppler Particle Analyser (P/DPA). Time-resolved velocity data for particles in size range ...
  • Comparison of CFD simulations and measurements of flow affected by coanda effect 

    Fišer, Jan; Jedelský, Jan; Vach, Tomáš; Forman, Matěj; Jícha, Miroslav (EDP Sciences, 2012-04-16)
    The article deals with experimental research and numerical simulations of specific phenomena in fluid flows called Coanda effect (CE), which has numerous important engineering applications. Although many researchers have ...
  • Comparison of different configurations of Phase Doppler Analyser 

    Zaremba, Matouš; Malý, Milan; Jedelský, Jan; Jícha, Miroslav (EDP Sciences, 2016-03-28)
    A phase Doppler anemometry (PDA) technique is widely used in experimental fluid mechanics to measure size and velocity of particles in the fluid flow. Even though this method is common in experimental fluid mechanics, there ...
  • Comparison of methods for evaluation of aerosol deposition in the model of human lungs 

    Bělka, Miloslav; Lippay, Josef; Lízal, František; Jedelský, Jan; Jícha, Miroslav (EDP Sciences, 2014-03-25)
    It seems to be very convenient to receive a medicine by inhalation instead of injection. Unfortunately transport of particles and targeted delivery of a drug in human respiratory airways is very complicated task. Therefore ...
  • Comparison of methods for flow border detection in images of smoke visualization 

    Caletka, Petr; Pech, Ondřej; Jedelský, Jan; Lízal, František; Jícha, Miroslav (EDP Sciences, 2016-03-28)
    A separation of the flow region from the surroundings is an essential step in the analysis of smoke visualization images. The separation can be performed using several detection methods from the image segmentation group. ...
  • Comparison of Y-jet and OIL effervescent atomizers based on internal and external two-phase flow characteristics 

    Mlkvik, Marek; Zaremba, Matouš; Jedelský, Jan; Jícha, Miroslav (EDP sciences, 2016-03-28)
    Presented paper focuses on spraying of two viscous liquids ( = 60 and 143 mPa·s) by two types of twinfluid atomizers with internal mixing. We compared the well-known Y-jet atomizer with the less known, “outside in liquid” ...
  • Depozice prachových částic z ovzduší 

    Bělka, Miloslav
    Těžiště práce je ve vyhodnocení depozice vláknových aerosolů v dýchacím traktu člověka. Vlákna mají schopnost pronikat hlouběji do plic a způsobovat vážné zdravotní problémy. Součástí práce je i rozdělení aerosolů, základy ...
  • Droplet dynamics and size characterization of high-velocity airblast atomization 

    Urbán, András; Zaremba, Matouš; Malý, Milan; Józsa, Viktor; Jedelský, Jan (Elsevier, 2017-02-07)
    Airblast atomizers are especially useful and commonplace in liquid fuel combustion applications. However, the spray formation processes, the droplet dynamics and the final drop size distributions are still not sufficiently ...
  • Effect of liquid preheating on high-velocity airblast atomization: From water to crude rapeseed oil 

    Urbán, András; Malý, Milan; Józsa, Viktor; Jedelský, Jan (Elsevier, 2019-04-01)
    Airblast atomization is a suitable model platform to understand atomization physics since the atomizer geometry has an insignificant influence on the spray formation. Besides its theoretical relevance, this configuration ...
  • Effect of nanoparticles concentration on the characteristics of nanofluid sprays for cooling applications 

    Malý, Milan; Moita, Ana; Jedelský, Jan; Ribeiro, Ana; Moreira, António (Springer, 2019-03-01)
    This study addresses the effect of nanofluid synthesis on the rheological properties of the resulting fluid and their consequent effect on the characteristics (size and velocity distribution of droplets, spray cone angle, ...
  • Effervescent Breakup and Combustion of Liquid Fuels: Experiment and Modelling 

    Broukal, Jakub
    Tato práce se zaměřuje na oblast effervescentních sprejů a jejich aplikace na kapalné spalování s důrazem na průmyslové spalovací komory. Oba aspekty – modelování a experiment – jsou řešeny. Práce obsahuje obecný úvod, ve ...
  • Empirical correlation for spray half cone angle in plain-jet airblast atomizers 

    Urbán, András; Katona, Bálint; Malý, Milan; Jedelský, Jan; Józsa, Viktor (Elsevier, 2020-10-01)
    Plain-jet airblast atomizers are widely used in industrial applications. The literature contains numerous papers on Sauter mean diameter, however, there is no estimation method available for spray cone angle, SCA, which ...