| Abstract [eng] |
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. |
