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Projects / Programmes source: ARIS

Enhanced boiling heat transfer utilising hierarchical functionalized surfaces (eHEATs)

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Research activity

Code Science Field Subfield
2.13.02  Engineering sciences and technologies  Process engineering  Transmissibility in solids and fluids 

Code Science Field
2.03  Engineering and Technology  Mechanical engineering 
Keywords
enhanced two-phase heat transfer; surface functionalization; nucleate boiling; long-term performance; laser surface engineering; wettability; micro/nano structures
Evaluation (rules)
source: COBISS
Evaluation of bibliographic research performance indicators according to ARIS methodology
Citations Citations for bibliographic records in COBIB.SI that are linked to records in citation databases
source: WoS source: Scopus source: COBISS
Researchers (16)
no. Code Name and surname Research area Role Period No. of publications
1.  55531  Mattia Bucci  Process engineering  Researcher  2021 - 2023  26 
2.  35645  PhD Jaka Burja  Materials science and technology  Researcher  2021 - 2023  322 
3.  25126  PhD Črtomir Donik  Materials science and technology  Researcher  2020 - 2023  316 
4.  05566  PhD Iztok Golobič  Process engineering  Researcher  2020 - 2023  773 
5.  29224  PhD Peter Gregorčič  Manufacturing technologies and systems  Researcher  2020 - 2023  263 
6.  56011  Armin Hadžić  Process engineering  Technical associate  2022 - 2023  26 
7.  32545  PhD Matej Hočevar  Materials science and technology  Researcher  2020 - 2023  153 
8.  56976  Samo Jereb  Process engineering  Researcher  2022 - 2023  18 
9.  21238  PhD Matija Jezeršek  Manufacturing technologies and systems  Researcher  2020 - 2023  375 
10.  18475  PhD Aleksandra Kocijan  Materials science and technology  Researcher  2020 - 2023  255 
11.  39927  PhD Jure Košir  Systems and cybernetics  Researcher  2021  14 
12.  08850  PhD Djordje Mandrino  Physics  Researcher  2020 - 2021  234 
13.  52341  PhD Matic Može  Process engineering  Researcher  2020 - 2023  146 
14.  27773  PhD Ivan Sedmak  Process engineering  Researcher  2020 - 2023  111 
15.  52342  Matej Senegačnik  Manufacturing technologies and systems  Technical associate  2020 - 2023  36 
16.  36685  PhD Matevž Zupančič  Process engineering  Head  2020 - 2023  260 
Organisations (2)
no. Code Research organisation City Registration number No. of publications
1.  0782  University of Ljubljana, Faculty of Mechanical Engineering  Ljubljana  1627031  29,223 
2.  0206  Institute of Metals and Technology  Ljubljana  5051622000  5,981 
Abstract
Nucleate boiling is an extremely efficient heat transfer mechanism capable of providing low temperature difference between the surface and the fluid. It is utilized both in everyday life and in engineering in applications ranging from cooling of electronic components and nuclear fuel rods to thermal management of equipment in spaceflight. Due to persistent technological advances, device miniaturization and increasing safety requirements, the need for efficient heat removal from critical components is also on the rise, which is in turn increasing the number of basic and applied research projects dealing with efficient heat transfer with the support of not only heat exchanger and electronic component manufacturers, but also leading institutions in space technology including ESA, NASA and CMSA. The prevailing boiling heat transfer enhancement method is surface modification. The eHEATs project aims to study boiling performance enhancement by developing state-of-the-art functionalized surfaces using direct laser texturing. This method allows modification of surface properties on the macro-, micro- and nanoscale (hierarchical structures) and affects the surface chemistry, which is fundamental for the development of surfaces with suitable topography and wettability for enhanced heat transfer using various fluids. Due to the distinctly interdisciplinary nature of the project, outstanding researchers from the fields of mechanical engineering, physics, laser technology and material science will be involved in the research. The interaction of three phases and an abundance of influencing parameters makes nucleate boiling a deeply complex dynamic phenomenon, the research of which requires an experimental approach. Boiling performance evaluation within the eHEATs project will be carried out using high-speed IR thermography to capture the unsteady temperature fields and high-speed video recordings to visualize the bubble dynamics. The data will be processed using custom algorithms to obtain key information about the boiling process. The development of enhanced boiling surfaces will at first be based on theoretical nucleation criteria and capillary wicking models. Following experimental testing, the surfaces will be optimized using a recently developed statistical percolative model based on evaluating interactions of randomly or discreetly distributed active nucleation sites. The purpose of the optimization will be increasing the nucleation frequency, achieving uniform active nucleation site distribution, and preventing horizontal bubble coalescence and local hotspots on the boiling surface, all of which will help surpass the performance of the current generation of structured boiling surfaces. Flexibility of the laser texturing method allows the creation of thin metallic layers, which the eHEATs project will use to develop hybrid surfaces by combining laser texturing and nanoscale coatings to study enhanced heat transfer in microgravity. Topography and surface chemistry analyses will be used to systematically study the ageing of surfaces due to exposure to boiling, which is a key factor in further development and implementation in real systems. Such research is unprecedented, making the results unique and groundbreaking on a global scale. The eHEATs project will not only provide better understanding of the mechanisms behind enhanced boiling heat transfer but will also establish a new field of developing environment-friendly and fast methods for surface functionalization. The content of the project is directly related to successfully completed and ongoing projects, the leaders of which are a part of the eHEATs team: ARRS L2-7172; ARRS J2-1741; ARRS BI-US/15-16-066; ESA 4200020289. By strengthening the cooperation with major foreign research agencies (ESA, CMSA and Massachusetts Institute of Technology - MIT), the eHEATs project will importantly contribute to developing the next generation technology in the field of enhanced heat transfer.
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