A pulsating heat pipe for space applications: Ground and microgravity experiments

Daniele Mangini, Mauro Mameli, Anastasios Georgoulas, L. Araneo, S. Filippeschi, Marco Marengo

Research output: Contribution to journalArticleResearchpeer-review

Abstract

A novel concept of a hybrid Thermosyphon/Pulsating Heat Pipe with a diameter bigger than the capillary limit is tested both on ground and in hyper/micro gravity conditions during the 61st ESA Parabolic Flight Campaign. The device is filled with FC-72 (50% vol.) and it is made of an aluminum tube (I.D. 3 mm) bent into a planar serpentine with five curves at the evaporator zone, while a transparent section closes the loop, allowing fluid flow visualizations in the condenser zone. Five heaters, mounted alternatively in the branches just above the curves at the evaporator zone, provide an asymmetrical heating thus promoting the fluid flow circulation in a preferential direction. The device has been tested at different positions (vertical and horizontal) and at different heat power input levels (from 10 W to 160 W). Ground tests show that effectively the device works as a thermosyphon when gravity assisted: in vertical position the device can reach an equivalent thermal resistance of 0.1 K/W with heat fluxes up to 17 W/cm2. In hor- izontal position the fluid motion is absent, thus the device works as a pure thermal conductive medium. The parabolic flight tests point out a PHP working mode: during the micro-gravity period, the sudden absence of buoyancy force activates an oscillating slug/plug flow regime, typical of the PHP operation, allowing the device to work also in the horizontal position. In some cases the hyper-gravity period is able to eliminate partial dry-outs restoring the correct operation until the occurrence of the next microgravity period.
Original languageEnglish
Pages (from-to)53-63
Number of pages11
JournalInternational Journal of Thermal Sciences
Volume95
DOIs
Publication statusPublished - 30 Sep 2015

Fingerprint

Heat pipes
Space applications
Microgravity
Thermosyphons
Evaporators
Flow of fluids
Gravitation
Boiler circulation
Experiments
Flow visualization
Buoyancy
Heat resistance
Heat flux
Aluminum
Heating
Fluids
Hot Temperature

Keywords

  • Pulsating heat pipe
  • Microgravity
  • Flow visualization
  • Capillary limit
  • Thermosyphon
  • Asymmetric heating

Cite this

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title = "A pulsating heat pipe for space applications: Ground and microgravity experiments",
abstract = "A novel concept of a hybrid Thermosyphon/Pulsating Heat Pipe with a diameter bigger than the capillary limit is tested both on ground and in hyper/micro gravity conditions during the 61st ESA Parabolic Flight Campaign. The device is filled with FC-72 (50{\%} vol.) and it is made of an aluminum tube (I.D. 3 mm) bent into a planar serpentine with five curves at the evaporator zone, while a transparent section closes the loop, allowing fluid flow visualizations in the condenser zone. Five heaters, mounted alternatively in the branches just above the curves at the evaporator zone, provide an asymmetrical heating thus promoting the fluid flow circulation in a preferential direction. The device has been tested at different positions (vertical and horizontal) and at different heat power input levels (from 10 W to 160 W). Ground tests show that effectively the device works as a thermosyphon when gravity assisted: in vertical position the device can reach an equivalent thermal resistance of 0.1 K/W with heat fluxes up to 17 W/cm2. In hor- izontal position the fluid motion is absent, thus the device works as a pure thermal conductive medium. The parabolic flight tests point out a PHP working mode: during the micro-gravity period, the sudden absence of buoyancy force activates an oscillating slug/plug flow regime, typical of the PHP operation, allowing the device to work also in the horizontal position. In some cases the hyper-gravity period is able to eliminate partial dry-outs restoring the correct operation until the occurrence of the next microgravity period.",
keywords = "Pulsating heat pipe, Microgravity, Flow visualization, Capillary limit, Thermosyphon, Asymmetric heating",
author = "Daniele Mangini and Mauro Mameli and Anastasios Georgoulas and L. Araneo and S. Filippeschi and Marco Marengo",
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A pulsating heat pipe for space applications: Ground and microgravity experiments. / Mangini, Daniele; Mameli, Mauro; Georgoulas, Anastasios; Araneo, L.; Filippeschi, S.; Marengo, Marco.

In: International Journal of Thermal Sciences, Vol. 95, 30.09.2015, p. 53-63.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Mangini, Daniele

AU - Mameli, Mauro

AU - Georgoulas, Anastasios

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AU - Marengo, Marco

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N2 - A novel concept of a hybrid Thermosyphon/Pulsating Heat Pipe with a diameter bigger than the capillary limit is tested both on ground and in hyper/micro gravity conditions during the 61st ESA Parabolic Flight Campaign. The device is filled with FC-72 (50% vol.) and it is made of an aluminum tube (I.D. 3 mm) bent into a planar serpentine with five curves at the evaporator zone, while a transparent section closes the loop, allowing fluid flow visualizations in the condenser zone. Five heaters, mounted alternatively in the branches just above the curves at the evaporator zone, provide an asymmetrical heating thus promoting the fluid flow circulation in a preferential direction. The device has been tested at different positions (vertical and horizontal) and at different heat power input levels (from 10 W to 160 W). Ground tests show that effectively the device works as a thermosyphon when gravity assisted: in vertical position the device can reach an equivalent thermal resistance of 0.1 K/W with heat fluxes up to 17 W/cm2. In hor- izontal position the fluid motion is absent, thus the device works as a pure thermal conductive medium. The parabolic flight tests point out a PHP working mode: during the micro-gravity period, the sudden absence of buoyancy force activates an oscillating slug/plug flow regime, typical of the PHP operation, allowing the device to work also in the horizontal position. In some cases the hyper-gravity period is able to eliminate partial dry-outs restoring the correct operation until the occurrence of the next microgravity period.

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KW - Microgravity

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