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Heat Transfer during Condensation of Steam-Air Mixture Flowing in Vertical Tube
Toman, Filip ; Masaryk, Michal (referee) ; Kořista, Milan (referee) ; Pospíšil, Jiří (advisor)
This thesis deals with the problem of condensation in the presence of non-condensable gases with a focus on heat and mass transfer inside a vertical pipe. The introductory part of the thesis is dedicated to the research analysis of the given issue. The attention is focused on the physically correct description of the events at the interface of the gas phase and the condensate film, as well as on the inclusion of the influence of the presence of non-condensable gases. Scientific hypotheses were developed based on this analysis. Subsequently, the objectives of the dissertation are formulated and the methods by which the objectives of the dissertation are solved, are presented. As part of the data evaluation, an analytical model was created enabling the quantification of heat and mass transfer for the measured conditions. This model was used to test variations of computational relationships published by various authors in the literature. The mathematical solution is supplemented by realized experimental measurements of the condensation coefficient of heat transfer and the total coefficient of heat transfer inside the pipe during the condensation of the steam-gas mixture in vertical pipes of three diameters, namely 16, 20 and 26 mm. At the end of the thesis, the most suitable combination of already published analytical relations is selected and is carried out as part of its refinement, using regression analysis.
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