prof. Ing. Václav Píštěk, DrSc.

1. Coanda effect along surfaces and impact on ventilation systems of cars

   Study of Coanda effect on surfaces. Impact of different angles, turbulence intensity, geometrical shape of inlets and alike on flow reattachment and stability. Research will be carried out by means of computational fluid dynamics modeling and by means of experiments (visualization, hot wire anemometer etc.).

   Tutor: Jícha Miroslav, prof. Ing., CSc.

2. Development of fire and smoke spread and visibility models in occupied spaces

   Study of smoke spread in occupied spaces of buildings and/or aircraft cabins, development of visibility models in correlation with smoke concentration. Research on systems of smoke mitigation and increase of visibility. Comparisons of different methods for the improvement of visibility (sprinklers, nano-structured particles tec.). Experimental validation of models by means of opacity measurements.

   Tutor: Katolický Jaroslav, doc. Ing., Ph.D.

3. Heat exchangers with minichannels of different geometry

   Design and cooperation in manufacturing minichannels with diameter 0,25 to 3mm. Design and cooperation in manufacturing and calibration of experimental rig. Measurements of heat transfer coefficient and pressure losses in smooth minichannels with diameters of 0,25 to 3mm and assumed Reynolds number 500 to 3000. Design of minichannel with intensified heat transfer surface, experiments and comparions with smooth minichannels

   Tutor: Jícha Miroslav, prof. Ing., CSc.

4. Image processing in fluid mechanics problems and Environmental Engineering

   The aim is to develop programs based on the integrated development environment from National Instrument IMAQ image processing problems in fluid mechanics and environmental engineering. They will used of modern hardware components to enable parallel processing, such as multicore processors and FPGAs. Problems can be tackled flow visualization using smoke and bubbles (evaluation, geometry and homogeneous current fluctuations of movement, the current interaction with the environment, the application of 2D images, possibly in 3D) or detection of particles in the images of optical, phase-contrast and, if present. electron microscope: fibers, pollen, porous particles (determination of geometrical parameters: length, diameter, porosity, particle counting, classification).

   Tutor: Štětina Josef, prof. Ing., Ph.D.

5. Simulation tool to predict conditions in a cabin of traffic means

   To develop simulation tool to predict thermal response of car (alternatively small aircraft) taking into account transient phenomena as well as solar radiation and radiation heat transfer between surfaces. To study influence of various parameters, like thermal capacity, conductivity, cabin occupancy etc.

   Tutor: Jícha Miroslav, prof. Ing., CSc.

6. Smooth particle hydrodynamics (SPH) method for the solution of flow field

   To perform critical a study and analysis of different meshfree methods and the assessment of their use for the solution of flow field. To develop a meshless computational method (Smooth particle hydrodynamics SPH) with application to fire and smoke spread.

   Tutor: Jícha Miroslav, prof. Ing., CSc.

7. Study of human comfort inside car/aircraft cabin using simulator - thermal manikin

   To study influence of various measures to reduce heat loads of human body in car/aircraft cabin. The study will focus on optimal function of cooling/heating, various surface reducing heat penetration into the cabin, cooled/heated seats, etc.

   Tutor: Jícha Miroslav, prof. Ing., CSc.

8. Study of particles transport and deposition in multiple branching of airways

   Experimental research on transport and deposition of particles of different charakteristice and size in multiple airways branching (e.g. human respiratory tract). Study of relatioship between sources of particles and their receptors (sitting passanger in the cabin) using thermal manikin with breathing option and filters. Study of penetration of large porous particles and comparison with nonporous particles. Use of different techniques to study deposition (gravimetry, fluorescence) and transport (several methods e.g. PDA). Study in steady as well as cyclic regimes.

   Tutor: Jícha Miroslav, prof. Ing., CSc.

9. Study of twin-fluid nozzles and atomization process of liquids in broad spectrum of viscosities

   To give an overview and classification of published designs of twin-fluid internal-mixing atomizers. To chose several the most prosperous atomizers, optimize their geometry based on publish data and fabricate them for experimental study. To upgrade present cold spray test bench for twin-fluid atomizers and extend the test bench for usage of different liquids. To test these atomizers in wide range of operation pressures and GLR and with several liquids of different viscosity. To study and compare directly their atomization characteristics with focus on atomization efficiency and spray steadiness. To describe spray structure of the selected twin-fluid atomizers and to elucidate their break-up mechanism in detail. in numerical simulations as input data.

   Tutor: Jícha Miroslav, prof. Ing., CSc.

10. The optimization attenuation of fluid temperature oscillations using latent heat thermal storage

    The scope of the theme is the attenuation of fluid temperature oscillations by means of latent heat thermal storage. The phase change of matter at constant pressure is almost an isothermal process and it is associated with the transfer of huge amount of heat (latent heat). This phenomenon can be employed in order to attenuate oscillations of fluid temperature. The investigations will focus on the attenuation characteristics of latent heat thermal storage with regard to thermal properties of the thermal storage material (heat of fusion, thermal conductivity). The studied cases will include the step change of fluid temperature and the periodic changes of fluid temperature (square wave, sinusoidal). The attention will be paid to the attenuation characteristics of latent heat thermal storage for various amplitudes and frequencies of the fluid temperature changes.

    Tutor: Štětina Josef, prof. Ing., Ph.D.