Author, Institution: Justina Jaseliūnaitė, Lithuanian Energy Institute
Science area, field of science: Technological Sciences, Energetics and Power Engineering, T006
Scientific Supervisor: Senior Researcher Dr. Marijus Šeporaitis (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering, T006)
Dissertation Defence Board of Energetics and Power Engineering Science Field:
Chief Researcher Dr. Viktorija Grigaitienė (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering, T006) – chairperson
Prof. Dr. Hab. Ali Cemal Benim (Düsseldorf University of Applied Sciences, Germany, Technological Sciences, Energetics and Power Engineering, T006)
Chief Researcher Dr. Algis Džiugys (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering, T006)
Chief Researcher Dr. Gediminas Račiukaitis (State Research Institute Center for Physical Sciences and Technology, Technological Sciences, Materials Engineering, T008)
Assoc. Prof. Dr. Giedrė Streckienė (Vilnius Gediminas Technical University, Technological Sciences, Energetics and Power Engineering, T006)
Dissertation defence meeting will be at the conference room at Lithuanian Energy Institute (Breslaujos 3 – 202, Kaunas)
The doctoral dissertation is available at the library of Kaunas University of Technology (Gedimino 50, Kaunas) and on the internet: J. Jaseliūnaitė el. dissertation.pdf
© J. Jaseliūnaitė, 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 heat transfer enhancement in microchannels with obstacle arrays designed to dissipate high heat fluxes. As conventional cooling solutions prove insufficient, the study analyzes how efficiency in these systems is influenced by changes in flow structure and regime. The main objective of the work is to create a method for evaluating thermohydraulic efficiency based on coherent structure parameters, by assessing the flow structure in microchannels. The study analyzes the influence of the obstacle configuration on pressure losses and thermal efficiency, and determines the dependence of the parameters of coherent structures on flow stability. The novelty of the work lies in the application of coherent Ω-structure analysis to microchannel studies, thereby quantitatively linking their parameters to thermohydraulic efficiency. The proposed method enables the prediction of cooling efficiency using exclusively hydrodynamic parameters. By correlating the interaction area of coherent structures, vortex intensity, and transverse flow, solving the energy equation can be bypassed, thereby significantly reducing computational costs. This methodological approach provides better insight into complex flow phenomena and their interactions with flow-bounding surfaces, while complementing conventional efficiency indicators.
13th of February, 2026, 13:00
Conference room at Lithuanian Energy Institute (Breslaujos 3 – 202)
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