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Proceedings Paper

Heat transfer intensification by increasing vapor flow rate in flat heat pipes
Author(s): Silviu Sprinceana; Ioan Mihai; Marius Beniuga; Cornel Suciu; Ioan C. Mihai
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Paper Abstract

Flat heat pipes have various technical applications, one of the most important being the cooling of electronic components[9]. Their continuous development is due to the fact that these devices permit heat transfer without external energetic contribution. The practical exploitation of flat heat pipes however is limited by the fact that dissipated power can only reach a few hundred watts. The present paper aims to advance a new method for the intensification of convective heat transfer. A centrifugal mini impeller, driven by a turntable which incorporates four permanent magnets was designed. These magnets are put in motion by another rotor, which in its turn includes two permanent magnets and is driven by a mini electrical motor. Rotation of the centrifugal blades generates speed and pressure increase of the cooling agent brought to vapor state within the flat micro heat pipe. It’s well known that the liquid suffers biphasic transformations during heat transfer inside the heat pipe. Over the hotspot (the heat source being the electronic component) generated at one end of the heat pipe, convective heat transfer occurs, leading to sudden vaporization of the liquid. Pressures generated by newly formed vapors push them towards the opposite end of the flat heat pipe, where a finned mini heat sink is usually placed. The mini-heat exchanger is air-cooled, thus creating a cold spot, where vapors condensate. The proposed method contributes to vapor flow intensification by increasing their transport speed and thus leading to more intense cooling of the heat pipe.

Paper Details

Date Published: 20 February 2015
PDF: 8 pages
Proc. SPIE 9258, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies VII, 92581P (20 February 2015); doi: 10.1117/12.2070417
Show Author Affiliations
Silviu Sprinceana, Stefan cel Mare Univ. of Suceava (Romania)
Ioan Mihai, Stefan cel Mare Univ. of Suceava (Romania)
Marius Beniuga, Stefan cel Mare Univ. of Suceava (Romania)
Cornel Suciu, Stefan cel Mare Univ. of Suceava (Romania)
Ioan C. Mihai, Stefan cel Mare Univ. of Suceava (Romania)

Published in SPIE Proceedings Vol. 9258:
Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies VII
Ionica Cristea; Marian Vladescu; Razvan Tamas, Editor(s)

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