Author, Institution: Kristina Biknienė, Kaunas University of Technology
Science area, field of science: Technological Sciences, Energetics and Power Engineering, T006
Research Supervisor: Assoc. Prof. Dr. Linas Paukštaitis (Kaunas University of Technology, Technological Sciences, Energetics and Power Engineering, T006)
Research Consultant: Prof. Dr. Hab. Gintautas Miliauskas (Kaunas University of Technology, Technological Sciences, Energetics and Power Engineering, T006)
Dissertation Defence Board of Energetics and Power Engineering Science Field:
Chief Researcher Dr. Hab. Algirdas Kaliatka (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering, T006) – chairperson
Prof. Dr. Adam Cenian (Institute of Fluid-Flow Machinery of the Polish Academy of Sciences, Poland, Technological Sciences, Energetics and Power Engineering, T006)
Prof. Dr. Algirdas Jasinskas (Vytautas Magnus University, Technological Sciences, Environmental Engineering, T004)
Chief Researcher Dr. Tadas Kaliatka (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering, T006)
Chief Researcher Dr. Sigitas Rimkevičius (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering, T006)
Dissertation defence meeting will be at Rectorate Hall of Kaunas University of Technology (K. Donelaičio 73 – 402, Kaunas)
The doctoral dissertation is available at the library of Kaunas University of Technology (Gedimino 50, Kaunas) and on the internet: K. Biknienė el. dissertation.pdf
© K. Biknienė, 2026 “The text of the thesis may not be copied, distributed, published, made public, including by making it publicly available on computer networks (Internet), reproduced in any form or by any means, including, but not limited to, electronic, mechanical or other means. Pursuant to Article 25(1) of the Law on Copyright and Related Rights of the Republic of Lithuania, a person with a disability who has difficulties in reading a document of a thesis published on the Internet, and insofar as this is justified by a particular disability, shall request that the document be made available in an alternative form by e-mail to doktorantura@ktu.lt.”
Annotation: The dissertation investigates the heat and mass transfer processes occurring within a droplet of a pure liquid. A thorough understanding of these processes is a fundamental prerequisite for the development of liquid dispersion technologies in the industrial, transport, and energy sectors. At the current stage of technology, dominated by powerful electronics and high-efficiency energy conversion, large amounts of heat are accumulated in relatively small spaces. To ensure the efficient and proper operation of these devices, relatively low-temperature spray cooling becomes essential. These systems use not only water but also ethanol, ethylene glycol, acetone, and other dispersed pure liquids, often in the form of individual droplets, whose ability to provide effective local cooling directly depends on the laws of droplet phase transitions. This study systematically analyzes the thermal state and phase change of pure liquid droplets (water, ethanol, ethylene glycol, and acetone) subjected to a heated and additionally humidified air flow, with parameters corresponding to the operating conditions of low-temperature cooling technologies. Special attention is paid to the transient regime, which, despite its importance in modern liquid dispersion technologies, has not yet been sufficiently investigated. During the experimental study, the peculiarities of the phase change of the studied liquids and the interaction of the factors determining them were identified, and a method for processing experimental data into dimensionless parameters was developed. These results have both theoretical and practical significance: they provide fundamental knowledge about the evaporation dynamics of pure liquids and allow for the prediction of the behavior of a “technological” droplet of the studied pure liquids under convective heating across a wide spectrum of dispersity.
17th of June, 2026, 11:00
Rectorate Hall of Kaunas University of Technology (K. Donelaičio 73 - 402, Kaunas)
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