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Analytical and Experimental Study of Heat and Mass Transfer in Pulsating Heat Pipes for Non-Gravity Flight Applications

Abstract : Integration of high power and performance electronic devices in modern spacecraft systems with heat generation of hundreds of watts per square centimeter crucially increases needs in high performance, low weight, energy efficient and reliable thermal management systems. Due to these specific demands, two-phase heat rejection devices are of major interest for space applications. The Pulsating Heat Pipes, as simple passive two-phase heat transfer devices, have become an excellent solution for space cooling systems. Today, operation of this kind of heat transfer devices is not fully studied, especially in microgravity. So, in the context of ESA consecutive projects INWIP and TOPDESS, evaluation of the flat plate pulsating heat pipe performances and operational peculiarities under different gravity conditions has been defined as the main aim of the present PhD work. Experimental studies conducted during this work concerned the thermal characterization of different flat plate pulsating heat pipes tested on ground and during four ESA Parabolic Flight Campaigns. Parametric investigations have been carried out for vertical and horizontal orientations of the device using different working fluids (including alcohol aqueous solutions, self-rewetting fluids and surfactant solutions), condenser temperatures, non-condensable gases concentrations and gravity levels (Earth, Martian, Lunar, hyper and microgravity). Obvious, and sometimes unexpected, performances improvement has been observed under certain conditions. Analytical studies of the two-phase flow inside the FPPHP, especially concerning the transition from stopover to high-amplitude oscillations (fluid flow “re-activation phases”) have been done thanks to high-frequency visualizations. Finally, the flow transition criterion, from the slug-plug flow regime to semi-annular/annular flow, was studied thanks to dimensionless analyzes considering the main parameters of the flow.
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Submitted on : Thursday, May 12, 2022 - 4:40:15 PM
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2022ESMA0002_slobodeniuk.pdf
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Maksym Slobodeniuk. Analytical and Experimental Study of Heat and Mass Transfer in Pulsating Heat Pipes for Non-Gravity Flight Applications. Other. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2022. English. ⟨NNT : 2022ESMA0002⟩. ⟨tel-03666685⟩

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