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Viscosity study of liquid materials
Januš, Petr ; Rozsívalová, Zdenka (referee) ; Frk, Martin (advisor)
Bachelor thesis focuses on the study of viscosity of liquid materials. Its aim is to study the mathematical and physical fundamentals of dynamic viscosity. The thesis presents a correlation between conductivity and viscosity of liquid insulators called Walden rule. Further part of work is a review of methods for measuring viscosity of liquids and classification of insulating liquids. The last section is the practical part in which it is verified Walden rule for available insulating liquids.
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Determination of the viscosity of various types of wastewater
Glombová, Pavla ; Rusník,, Igor (referee) ; Hluštík, Petr (advisor)
The aim of this diploma thesis is a description of viscosity as a physical characteristic of liquids, next a description of projecting different types of sewer systems (pressure sewer system, vacuum sewer system and gravity sewer system). There was a range of density and viscosity of wastewater experimentally determined. These values were compared with ordinary values used in practice. The practical part of this work consists of sampling wastewater from different types of sewer systems and various localities. Chemical-biological analysis was realized on those samples with defined density, then dynamic viscosity was measured by the rotary viscometer for various temperatures. Measured data are evaluated. Finally, a calculation related to the design of sewers was made.
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Study of rheological properties of concrete with the addition of low-temperature plasma treated polymer fibers
Gromeš, Vít ; Herka, Petr (referee) ; Bodnárová, Lenka (advisor)
Polypropylene fibers are used in concrete mixtures to avoid early cracks during shrinkage. Low thickness of each fiber and low density are reasons, why these fibers are effective in small dosage. Their disadvantages are smooth surface and hydrophobic character of polypropylene, thus it is necessary to improve their surface for better spread during mixing and to reach needed adhesion between fibers and cement paste. In present time are using chemical solutions applied on surface of the fibers to provide better water absorption, but the trend is reducing of using chemicals in industry and this situation demands new technology. There is possible solution, polypropylene fibers treated by low-temperature plasma. This method was developer by cooperation Masaryk University in Brno with company KrampeHarex and Brno Universiry of Technology. The goal of this thesis is to bring comparison, of influence on rheology properties of fresh concrete, between admixed the fibers with applied chemical layer and low-temperature plasma treated polypropylene fibers.
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Uncertainties of measurements of the dynamic viscosity
Januš, Petr ; Rozsívalová, Zdenka (referee) ; Frk, Martin (advisor)
The thesis is deal with measuring the temperature dependence of dynamic viscosity and the calculation of measurement uncertainties. The thesis writes up the physical nature of viscosity and rheological properties. Next it is write up an overview of possible methods for measuring viscosity of liquids and overview of methods for measuring the density of liquids. An important chapter is the statistical evaluation of measured data represented mainly measurement uncertainties. In the practical part of the work is done workplace for measure the temperature dependence of dynamic viscosity. It is used two methods of measuring viscosity of liquids and two samples of liquids. Finally is done statistical evaluations of measurement. Based on the calculated measurement uncertainty measurement methods are compared.
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Analysis of operating fluids properties
Chrobák, Jan ; Rozsívalová, Zdenka (referee) ; Frk, Martin (advisor)
This diploma thesis is focused on introducing the mathematical and physical fundamentals of viskosity, density and refractive index of liquids and methods of its measurement. Based on available literatures specify review of areas in which the measurement of dynamic viscosity is used for evaluation the actual state of liquid materials. Discuss the possibility of using for example variables to determine the concentration of fat in milk and ethanol in alcoholic beverages. The sample of liquid to realize the practical measurements.
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Construction of a brake mechanism
Laštůvka, Martin ; Galas, Radovan (referee) ; Frýza, Josef (advisor)
The bachelor's thesis describes design of brake and arrestment mechanism for high pressure viscometer which is placed in the laboratory of the Institute of Machine and Industrial Design FME BUT. The Brake mechanism is able to brake torque of 50 Nm and the arrestment mechanism allows to stop the shaft at precisely defined angles. When designing the device is used current the state of knowledge.
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