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ABSTRACT
This article deals with two kinds of phase-change systems for thermal management, namely micro-heat pipes (and two-phase heat spreaders that are to be seen as an extension of micro-heat pipes) and pulsating heat pipes. The operating principles and various examples of the application of these technologies are described. The operation of pulsating heat pipes is complex and still poorly understood. It is for this reason that neither a model nor a numerical design tool is currently available. On the contrary, a relatively general model for the design of micro-heat pipes is presented. This model can be implemented using a simple spread sheet to determine the temperature field in the heat pipe and the maximum transferable heat rate as a function of the geometrical characteristics and thermal boundary conditions.
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Jocelyn BONJOUR: Professor at INSA Lyon - CETHIL UMR5008 CNRS – INSA – Université Lyon 1
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Frédéric LEFÈVRE: Professor at INSA Lyon - CETHIL UMR5008 CNRS – INSA – Université Lyon 1
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Valérie SARTRE: Senior Lecturer HDR at INSA Lyon - CETHIL UMR5008 CNRS – INSA – Université Lyon 1
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Yves BERTIN: Professor at ENSMA - Institut Pprime UPR3346 CNRS – ENSMA – Université de Poitiers
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Cyril ROMESTANT: CNRS Research Engineer - Institut Pprime UPR3346 CNRS – ENSMA – Université de Poitiers
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Vincent AYEL: Senior lecturer at ENSMA - Institut Pprime UPR3346 CNRS – ENSMA – Université de Poitiers
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Vincent PLATEL: HDR Senior Lecturer at the Université de Pau et des Pays de l'Adour - LaTEP, Université de Pau et des Pays de l'Adour - This dossier has been prepared as part of the activities of the CNRS GdR 2613 "Two-phase cooling systems" (SYREDI).
INTRODUCTION
Conventional capillary heat pipes and two-phase thermosyphons, described in
With the development of electronics, the miniaturization of the systems to be cooled is becoming ever more demanding, while the thermal power to be dissipated is increasing. The result is an extremely rapid increase in the flow densities to be transferred, which are now reaching values that are no longer compatible with conventional heat pipe technology. What's more, their performance in terms of temperature field homogenization is sometimes too low to meet industrial requirements.
In response to these new challenges, new concepts for two-phase cooling systems have emerged, such as two-phase microheat pipes and diffusers, or oscillating heat pipes, discussed in this issue. Another concept that has seen strong development, particularly for space applications, is two-phase loops, the subject of the
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Two-phase thermal control systems
Micro-pipelines and two-phase thermal diffusers
Bibliography
Events
International Heat Pipe Conference (IHPC). Periodicity: 2 to 3 years
14th edition: Florianopolis, Brazil, April 22-27, 2007 http://www.lepten.ufsc.br/ ~14ihpc
15th edition: Clemson (SC), USA, April 25-30, 2010 http://www.clemson.edu/15ihpc
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