Comparison between numerical simulation and on-orbit experiment of oscillating heat pipes

Daimaru, Takurou; Nagai, Hiroki; Ando, Makiko; Tanaka, Kosuke; Okamoto, Atsushi; Sugita, Hiroyuki

doi:10.1016/j.ijheatmasstransfer.2017.01.078

Cited by 38 publications

(17 citation statements)

References 21 publications

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“…The system behaved as coupled nearly harmonic oscillators with a phase shift between oscillations of neighboring plugs. The same team further improved their simulation code by implementing the liquid film drying (although within only one dry area per vapor bubble) and the bubble generation [Daimaru et al (2017a)]. For the first time, they introduced into simulation the check valves and a simulation of the heat spreader that provided a thermal interaction between the different PHP branches as discussed in sec.…”

Section: Liquid Filmsmentioning

confidence: 99%

Pulsating Heat Pipes: Basics of Functioning and Modeling

Nikolayev

Marengo²

2018

Encyclopedia of Two-Phase Heat Transfer and Flow IV

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Section: Liquid Filmsmentioning

confidence: 99%

Pulsating Heat Pipes: Basics of Functioning and Modeling

Nikolayev

Marengo²

2018

Encyclopedia of Two-Phase Heat Transfer and Flow IV

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“…The menisci-related second term of Eq. (3) is sometimes included into F [33]. The pressure loss in the PHP tube turns may be important, so a supplementary force F turn comes from a curved tube.…”

Section: Pressure Drop In the Liquid Plugsmentioning

confidence: 99%

“…By combining Eqs. (33) and (34) and by assuming a constant in time ∆T = T w − T sat (p) (i.e. both an isothermal evaporator wall due to its high heat conductivity and constant vapor pressure), one gets a closed form equation for δ that solves to [75]…”

Section: Liquid Film Profile At Phase Changementioning

confidence: 99%

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Physical principles and state-of-the-art of modeling of the pulsating heat pipe: A review

Nikolayev

2021

Applied Thermal Engineering

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The Pulsating (called also oscillating) Heat Pipe (PHP) is a high performance passive heat transfer device. It consists in a closed capillary channel folded into several meanders, evacuated, and partially filled with a liquid and its vapor. One side is in thermal contact with a hot spot, the other with a cold spot. The oscillation of the liquid plugs and vapor bubbles spontaneously occurs after the heating beginning. The heat exchange takes place not only by latent heat transfer, but also by liquid convection. Both this advantage and the PHP structural simplicity make it competitive with respect to other kinds of heat pipes. However, the PHP operation is non-stationary and depends on many physical and material parameters. As a result, application of empirical correlations is quite unsuccessful. More sophisticated direct modeling is thus required. In this review, we present the past, present, and future perspectives of the theoretical PHP studies. The physical phenomena on the level of a single bubble and single liquid plug is addressed first. In this context, the modeling of the simplest, single branch PHP is described as a necessary first step toward the PHP understanding and model validation. The modeling of interaction between the bubbles and plugs (bubble generation and disappearance, plug evaporation) is discussed next. Finally, the state of the art of the physical modeling and simulation of the multi-turn PHP is reviewed and the difference between existing approaches is explained.

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“…The thermal response in microgravity environment is particularly interesting because it allows to eliminate the effect of gravity on the device thermal behaviour and understand that, for a capillary planar PHP there is practically no difference from the thermal response obtained during microgravity and the vertical to horizontal tilting manoeuvre on ground [4]. Several investigations on capillary PHPs has been performed in the last years both on parabolic flights by Gu et al [5] [6], by Ayel et al [7] by Taft et al [8], sounding rocket campaigns by De Paiva et al [9] [10] and even on orbit [11] [12] by the group of Prof. Daimaru. This last experiment is very important because it provides long term experiments in relevant environment bringing the PHP to a higher technological readiness level for space (TRL = 7).…”

Section: Introductionmentioning

confidence: 99%

Start-up in microgravity and local thermodynamic states of a hybrid loop thermosyphon/pulsating heat pipe

Mameli

Catarsi

Mangini

et al. 2019

Applied Thermal Engineering

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A wickless passive two phase closed loop heat transfer device especially designed for a future implementation on the heat transfer host module of the International Space Station is tested in relevant environment on board a parabolic flight. The tube internal diameter (3mm) is larger than the static capillary threshold evaluated in normal gravity for this working fluid (FC-72), leading the device to work as a loop thermosyphon on ground and in hypergravity conditions, and as a Pulsating Heat Pipe when micro-gravity occurs. Novel start up tests, where the heat load has been provided after the occurrence of microgravity, show that the 20s microgravity period is enough for the device activation and, most important, that the device activation is purely thermally induced and not affected by the previous acceleration field. Two miniaturized pressure transducers and direct fluid temperature measurement via two micro-thermocouples, allow to provide a detailed insight on the fluid local thermodynamics states both in the evaporator and in the condenser zone during microgravity. It is shown that the two-phase fluid close to the evaporator and the condenser is subjected to several degrees (up to 5 K) of superheating or subcooling. The level of subcooling seems to increase with the heat input level both in terms of temperature difference and in terms of percentage time with respect to the whole microgravity period.

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Comparison between numerical simulation and on-orbit experiment of oscillating heat pipes

Cited by 38 publications

References 21 publications

Pulsating Heat Pipes: Basics of Functioning and Modeling

Pulsating Heat Pipes: Basics of Functioning and Modeling

Physical principles and state-of-the-art of modeling of the pulsating heat pipe: A review

Start-up in microgravity and local thermodynamic states of a hybrid loop thermosyphon/pulsating heat pipe

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