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Microgravity Science and Technology

, Volume 31, Issue 3, pp 261–268 | Cite as

Research on Heat Transfer Performance of the Open-Loop Micro Pulsating Heat Pipe with Self-Rewetting Fluids

  • Koji FumotoEmail author
  • Misaki Sasa
  • Takahiro Okabe
  • Raffaele Savino
  • Takao Inamura
  • Minori Shirota
Original Article
Part of the following topical collections:
  1. Heat pipe systems for thermal management in space

Abstract

As technology becomes increasingly miniaturized, extremely localized heat dissipation leads to the challenge of how to keep these devices from overheating. A pulsating heat pipe (PHP) is an excellent cooling device based on the phase change of a working fluid. Experiments are performed to investigate the thermal performances of a Micro Pulsating Heat Pipe (MPHP) using different working fluids. The MPHP consists of 20 parallel channels made of a copper capillary tube with an internal diameter of 0.8 mm. The MPHP is filled with ethanol, deionized water and an aqueous solution of 1-butanol as working fluids, with different filling ratios (FRs) in the range 40–70 vol.%. The 1-butanol aqueous solution is known as a self-rewetting fluid, i.e. a dilute aqueous solution of alcohols with a number of carbon atoms higher than four (such as 1-butanol and pentanol). The surface tension of self-rewetting fluids decreases gradually with an increase in temperature, reaching a minimum around 60 °C, and subsequently increases gradually at higher temperatures. Therefore, at relatively high temperature self-rewetting fluids flow towards the regions at higher temperature due to the Marangoni effect. This flow should improve the boiling phenomenon, which is very important in the heat transfer mechanism of the MPHP. The experimental results indicate that, in the case of self-rewetting fluid, the stable oscillating motion in the MPHP arises at the heat load regime lower than that with water. In addition, the effective thermal conductivity of the MPHP with the highest concentration of self-rewetting fluid is higher than that with other fluids in the high heat load regime.

Keywords

Pulsating heat pipe Self-rewetting fluid Marangoni effect Micro heat transport device Heat transfer performance 

Nomenclature

A

Cross section area (m2)

FR

Fill ratio of working fluid (vol.%)

L

Length between the heating and cooling section (m)

Q

Input power (W)

R

Thermal resistance (K/W)

T

Temperature (°C)

Greek Symbols

λeff

Effective thermal conductivity (W/m▪K)

Subscripts

a

Adiabatic

c

Cooling

h

Heating

ave.

Average

Notes

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringAoyama Gakuin UniversitySagamiharaJapan
  2. 2.Department of Intelligent and MachinesHirosaki UniversityHirosakiJapan
  3. 3.Department of Industrial EngineeringUniversity of Naples FedericoIINaplesItaly

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