Improving the performance of flat heat pipes by exploiting benefits of additive manufacturing

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Abstract

Next to the industrial pick-up of Flat Heat Pipe (FHP) technology, the overall understanding of its two-phase heat transfer characteristics will contribute to further improvements of its performance. In this study, an FHP with dimensions of 20×40×6 mm3 was designed and manufactured. Investigations until now have concentrated on conventional manufacturing technologies rather than on the performance of FHPs using novel Additive Manufacturing (AM) techniques. Surface-functional wick structures were additively fabricated having the appearance of a screen mesh enriched with sintered-like microstructures. The effects of heat load (ranging from 7.5 to 82.5 kW/m2), cooling water temperature (ranging from 25°C to 45°C) and inclination angle (horizontal to vertical) on the FHP’s heat transfer characteristics were examined experimentally. In this paper, key performance indicators, such as temperature distribution, thermal resistance and superheat, are discussed. Results show that the developed FHP can effectively transfer heat. Moreover, optimal combinations of cooling water temperature and inclination angle were found defined by the lowest superheat and thermal resistance. A minimum total thermal resistance of 0.30 K/W for a heat load of 67.5 kW/m2 was reached for the following conditions: (a) 30° inclination angle and 25°C cooling water temperature, or (b) horizontal orientation and 35°C cooling water temperature. Moreover, as the cooling water temperature decreases from 45°C to 25℃, the condenser wall temperature decreases; however, thermal resistances do not decrease continuously as well. Also, tilting the FHP at relatively high heat loads does not impact the thermal performance. The FHP proposed in this study profits from novel AM fabrication capabilities and could suit thermal management challenges of current and future electronic components due to its excellent heat transfer characteristics, consistent temperature distribution and manufacturing flexibility.
Original languageEnglish
Title of host publicationTHERMINIC 2022 - 28th International Workshop on Thermal Investigations of ICs and Systems, Proceedings
PublisherIEEE
Pages1-6
Number of pages6
ISBN (Electronic)978-1-6654-9229-4
ISBN (Print)978-1-6654-9230-0
DOIs
Publication statusPublished - 22 Nov 2022
Event28th International Workshop on Thermal Investigations of ICs and Systems, THERMINIC 2022 - The Alex Hotel Dublin, Dublin, Ireland
Duration: 28 Sept 202230 Sept 2022
Conference number: 28
https://therminic2022.eu/

Conference

Conference28th International Workshop on Thermal Investigations of ICs and Systems, THERMINIC 2022
Abbreviated titleTHERMINIC
Country/TerritoryIreland
CityDublin
Period28/09/2230/09/22
Internet address

Keywords

  • 22/4 OA procedure

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