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Study of heat transfer by turbulent flow in cold helium gas in experiment with Rayleigh-Bernard convection at ISI CAS in Brno
Balko, Marek ; Štigler, Jaroslav (referee) ; Macek, Michal (advisor)
The diploma thesis deals with the study of Rayleigh-Bénard convection for Rayleigh numbers in the range 1E8-1E14. The evaluated data come from an experiment with cryogenic helium in a cylindrical cell in a configuration with cell diameter D = 30 cm, height L = 30 cm and a second configuration with cell diameter D = 30 cm, height L = 15 cm. Miniature sensors recorded temperature fluctuations over time under various physical conditions and properties of helium. Using MATLAB software, the output parameters of the system (Nusselt and Reynolds numbers) and their dependence on the control parameters (Rayleigh and Prandtl numbers) were determined from the measured data. A new approach to the distribution of measured signals according to the direction of large scale circulation was used in the work, which leads to improved analysis. Reynolds numbers were evaluated using the so-called elliptic method. Furthermore, the work deals with the study of the coherent structure of the large scale circulation inside the cell.
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Water wheels
Klezla, Vojtěch ; Štigler, Jaroslav (referee) ; Haluza, Miloslav (advisor)
Water wheels are the topic of this bachelor thesis, which is divided into three parts. The first one describes a history of water wheels. The second part is focused on different types of water wheels and basic part of water construction. In the last part is concept and calculation of overshot bucket water wheel and adjustment of the parameters of Poncelet water wheel.
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Flow in channels with open water level
Palička, Miroslav ; Štigler, Jaroslav (referee) ; Haluza, Miloslav (advisor)
This bacherol thesis deals with steady water flow, in open channels with different cross-sections. The main aim was mathematical derivation of relations for the most favorable water level, graphic representation of those relations and numerical confirmation of results. Practical use and evaluation of results are summarized in conclusion.
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The Operating Point of the Centrifugal Pump.
Konečná, Kateřina ; Haluza, Miloslav (referee) ; Štigler, Jaroslav (advisor)
Target of diploma thesis The Operating Point of the Centrifugal Pump was create program for analyze system of pumps, it would be an effective instrument at projection these systems. Program is divided into two parts: system characteristic and performance characteristic. Subject of this thesis is create pumps database, enter performance characteristics and succeeding working with them. Program enable regulation pump with change speed and cooperation two pumps, work in parallel or series. The result of program is project system of pumps on enter parameters with more economy work.
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Fluid flow in open chanels
Netopilík, Jan ; Haluza, Miloslav (referee) ; Štigler, Jaroslav (advisor)
Water has been, is and will be an integral and crucial part of everyday life of all people. Since ancient times people have been transporting water by channels not only for irrigation. The aim of this thesis is to get acquainted with the theory of its behavior in artificial canals. Then show one of the ways how to solve a channel that has a zero bottom slope.
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The Different Kinds of the Sewage Delivery
Vosáhlo, David ; Haluza, Miloslav (referee) ; Štigler, Jaroslav (advisor)
The aim of this bachelor’s thesis is presenting the possibilities of different kinds of the sewage delivery. It is described a division and a brief overview of these types. Furthermore their main parts, function and using in practise are introduced. Pumps and their main components are depicted in the pictures or simple schemes.
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Design of a micro waterpower turbines for low head and low dicharge
Macek, Libor ; Fic, Miloslav (referee) ; Štigler, Jaroslav (advisor)
This diploma thesis discusses the issue of finding type of water turbine for very low heads and low discharges, which could be operated as mobile micro hydropower plant in island mode. Thesis deals with summary of appropriate choices of water turbine for needs of micro hydropower plant. Essential part of diploma thesis deals with design of optimized waterwheel. Waterwheel was chosen because commercial high-speed turbines have low efficiency for low heads. Waterwheel was manufactured and measured in laboratories of Fluid engineering. Measurement output was discharge and efficiency characteristic of turbine. The price calculation was made after manufacture.
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