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The effect of lubricant contamination and degradation on lubricating film behavior
Strnad, Jan ; Dzimko, Marián (referee) ; Omasta, Milan (advisor)
Lubrication contamination and degradation is one of the major causes of unexpected failure of tribological nodes. As a result, different levels of maintenance are introduced in practice, leading to a longer service life of the lubricated node. These systems often include sophisticated on-line diagnostic tools that can be used to evaluate a sample of a lubricant using certain variables such as viscosity, number of particles, humidity, dielectric constant, etc. Based on changes of these variables some systems can make corrective measures such as filtering or complete replacement of lubricant. Therefore, the aim of this experimental thesis is to determine the influence of lubrication contamination (solid particles, moisture) and degradation (oxidation) on the lubricating film behavior with respect to its limit bearing capacity. To examine the thickness of the lubricating film, friction and wear, an optical and MTM tribometer, in the ball-on-disc configuration, was used.
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Technology sputtering of flue-gas
Hladík, Petr ; Brázdil, Marian (referee) ; Hrnčířová, Michaela (advisor)
The object of this bachelor’s thesis is to create a research in field of flue gas scrubbing technology. In the first part, there are briefly outlined issues of size and shape of particles present in flue gas after combustion. Next part focuses on basic general characteristics of separators. Main part treats of individual types of separators. Following chapters deal with emission limits in Czech Republic and future development of the field. Thesis is concluded by sample calculation of the cyclone separator.
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CFD modelling of the initial phase of fouling inside convective section of a combustion facility
Zlámal, Filip ; Juřena, Tomáš (referee) ; Strouhal, Jiří (advisor)
The aim of this thesis was to create, based on the knowledge obtained from research, a CFD simulation of initial phase of fouling of solid particles during the combustion of solid fuels. The introduction of the work summarizes the mechanisms of fouling by solid particles. The introduction of the work summarizes the mechanisms of fouling by solid particles. Approaches to modelling the impact and deposition of particles are also described. A model is built, which is implemented in the ANSYS Fluent software with the addition of user-defined functions. The model is tested on a model of the convective part of an experimental device for burning solid fuels.
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The effect of lubricant contamination and degradation on lubricating film behavior
Strnad, Jan ; Dzimko, Marián (referee) ; Omasta, Milan (advisor)
Lubrication contamination and degradation is one of the major causes of unexpected failure of tribological nodes. As a result, different levels of maintenance are introduced in practice, leading to a longer service life of the lubricated node. These systems often include sophisticated on-line diagnostic tools that can be used to evaluate a sample of a lubricant using certain variables such as viscosity, number of particles, humidity, dielectric constant, etc. Based on changes of these variables some systems can make corrective measures such as filtering or complete replacement of lubricant. Therefore, the aim of this experimental thesis is to determine the influence of lubrication contamination (solid particles, moisture) and degradation (oxidation) on the lubricating film behavior with respect to its limit bearing capacity. To examine the thickness of the lubricating film, friction and wear, an optical and MTM tribometer, in the ball-on-disc configuration, was used.
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Technology sputtering of flue-gas
Hladík, Petr ; Brázdil, Marian (referee) ; Hrnčířová, Michaela (advisor)
The object of this bachelor’s thesis is to create a research in field of flue gas scrubbing technology. In the first part, there are briefly outlined issues of size and shape of particles present in flue gas after combustion. Next part focuses on basic general characteristics of separators. Main part treats of individual types of separators. Following chapters deal with emission limits in Czech Republic and future development of the field. Thesis is concluded by sample calculation of the cyclone separator.
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