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Visualisation of the flow in the ventilation unit
Šebetka, Kryštof ; Fišer, Jan (referee) ; Pech, Ondřej (advisor)
This bachelor thesis deals with the basics of hydrodynamics. The basic principles and functions of flow visualization are described. Different types of visualizations are also discussed, followed by a list of specific visualization methods that are described in more detail. Another topic is ventilation and air conditioning. The thesis includes a short summary of the historical development of ventilation and air-conditioning and brief information about this industry. General descriptions of the components that are most relevant to the industry are also covered. Then the thesis comes to the experimental part, where is description of the ventilation unit inside which the flow visualization was performed. This is followed by the description of the experiment itself, the aim of which was to perform the flow visualization by the smoke method inside the ventilation unit, the construction of which was gradually modified to make the visualization as simple as possible and as recognizable as possible. The apparatus for the visualization is described, as well as the process of gradual development of the unit, how the different components had to be modified to improve the quality of the visualization. This is illustrated in photographs showing the flow before and after the modifications. The last section describes the process of trying to reduce the pressure losses that occurred between the different components of the ventilation unit, which were measured and compared at different stages of the modifications.
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Image processing methods in application to Kármán vortices
Šimůnek, Petr ; Hudec, Martin (referee) ; Himr, Daniel (advisor)
This diploma thesis focuses on flow visualization and image processing methods, with the aim of applying this theory to the practical analysis of fluid flow with particles. The introductory part of the thesis reviews flow visualization methods that are important for understanding fluid behavior in different systems and environments. Then it focuses on image processing methods, that are crucial for the analysis of image data obtained from flow experiments. In the practical part of this thesis, these theoretical insights are applied to the analysis of a series of images of fluid flow with particles in a tube obtained with a camera. The main objective is to describe fluid flow and identify the Kármán vortex, which is generated when the flow passes an obstacle.
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Visualisation of the velocity field behind the cooling fan of a passenger car
Vrubel, Vít ; Vondruš, Jan (referee) ; Šebela, Kamil (advisor)
This thesis discusses the development of a program and methodology for measuring the velocity vector field behind the fan of a passenger car using image analysis and recording the movement of the tufts. The theoretical part briefly describes other methods for measuring the vector field in the gas stream at low speeds. Furthermore, the work contains a selection of technical papers dealing with similar issues is also presented. In the following chapters a general description of the equipment used is given. The last part of the thesis is devoted to the design of the measurement condition and the development of the program for the actual evaluation. Finally, an evaluation of the method and possible future developments are discussed.
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Flow visualization methods
Ďurdina, Lukáš ; Jedelský, Jan (referee) ; Lízal, František (advisor)
ĎURDINA, L. Flow visualization methods. Brno: Brno University of Technology, Faculty of Mechanical Engineering, 2010. 45 p. Thesis supervisor Ing. František Lízal. This thesis deals with fluid flow visualization methods with respect to their practical application possibilities. Chronological description of the historically valuable visualization experiments emphasises the role of visualization in the experimental fluid mechanics. A brief characteristic of the flow field contains mathematical description of the objects, which can be visualized. Visualization methods are divided into experimental and computer aided methods. Individual methods are ordered subsequently beginning with those with lowest requirements for equipment to the more sophisticated methods. Various techniques, which provide qualitative and quantitative description of the tested gas or liquid flow, are described. The overview for the choice of methods for various applications sums up the important facts from previous chapters. Description of a simple helium bubble flow visualization experiment realized in a lab can be found at the end of the thesis.
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Interesting cases of fluid mechanics
Čáp, Filip ; Hájek, Ondřej (referee) ; Jedelský, Jan (advisor)
This bachelor thesis deals with the description of some interesting phenomena in the field of fluid mechanics, methods of flow visualization and its recording using a high-speed camera. First, a number of terms and different types of fluid flow are briefly introduced, which is followed by the description of the methods of visualization that enhance the visibility of flow of liquids and gases. The thesis also describes high-speed cameras and examines some interesting effects in fluid dynamics which can be encountered in everyday life as well as in engineering practice. The last chapter is then dedicated to the conducted experiments and their recordings.
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Modern flow visualization techniques
Pištěcká, Kateřina ; Koutník, Tomáš (referee) ; Popela, Robert (advisor)
The subject of this bachelor thesis is an overview of the flow visualization methods applied in the wind tunnels and fly tests. An overview of flow visualization methods is presented in the first part of the work. The particular methods are presented and evaluated with respect of its complexity, requirements on the instrumentation and expanses. The pros and cons are mentioned for each method finally. The second part of the work deals with selection of the flow visualization method suitable for application in the wind tunnel of the Aeronautical department of the VUT Brno.
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Vizualization of liquid break-up from atomization nozzles
Janáčková, Lada ; Bělka, Miloslav (referee) ; Jedelský, Jan (advisor)
V oblasti mechaniky tekutin hraje vizualizace významnou roli. Fotografie poskytují vhled do zásad chování tekutin a obecně pomáhají k lepšímu pochopení fyzikálních procesů proudění. Tato práce se zabývá vizualizací rozpadu kapalin u rozprašovacích trysek. Práce popisuje základy rozpadu kapalin, stejně jako metody pro vizualizaci. Dále je v práci probrána a experimentálně testována analýza prvků ve vizualizačních metodách. Laboratorní testy byly provedeny na malé tlakové vířivé trysce určené pro spalování kerosinu v proudovém leteckém motoru a část experimentů byla provedena na tlakové spirálové trysce. Práce dokumentuje vliv zdroje světla na kvalitu fotografie. Chování spreje je navíc analyzováno pomocí makrofotografie se zaměřením na primární rozpad, který hraje hlavní roli v celém procesu tvorby spreje a sprejových charakteristik.
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Flow visualization
Vavrla, Zdenek ; Šperka, Oldřich (referee) ; Rudolf, Pavel (advisor)
This bachelor´s thesis deals with fluid flow visualization methods in the air and water. First brief characteristic of the basic concepts of fluid flow is described, such as streamline, laminar and turbulent flow. The described visualization methods are divided into certain types and are used for fluid or gas. These methods provide a qualitative view of the flow and create the overview of the characteristics of gas or liquid flow. Some of these methods are simple and some are more complex. Finally, a simple experiment of liquids flow visualization is described by very powerful laser pointer.
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Application of HS camera to problems of fluid mechanics
Bolcek, Adam ; Elcner, Jakub (referee) ; Jedelský, Jan (advisor)
The main subject of this bachelor thesis is visualization of liquids and gases and their recor-ding with the help of a high-speed camera. The first part deals with types of the high-speed cameras. Also, it is concerned with the description of the Olympus i-SPEED 2 camera which was used for the experiment. Finally, the thesis investigates fundamental parameters of the high-speed cameras and their influence on the recording. The second part describes different methods of visualisation of liquids and gases and also consequent advantages and disadvantages of using each particular method. The last part is dedicated to the creation of my own recording of the visualisation of flowing of gas and its analysis and also to the finding of an optimal setting of the camera and of the lighting of the scene of the recording.
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