Abstract
In the present work, diffusion bonding technology used for fabrication of pulsating heat pipes (PHP) in a high-vacuum, high-pressure and high-temperature furnace is discussed. Seven different configurations of PHPs were manufactured, subjected to different fabrication parameters. PHPs with 10 and 26 parallel channels of circular and square cross-sectional areas were constructed. In addition, a PHP with a novel cross-sectional channel geometry, composed by a circular area with lateral grooves, which is easily fabricated by the present technology, is proposed. The deformation of the geometries of the channel cross sections was observed. The square channel PHP showed large deformation, while the deformations of the circular ones, including the new proposed geometry, were small. The distribution of the PHPs along the matrix in a single bonding cycle showed to be a very important parameter: Those PHPs produced in parallel presented some deformation and leakage problems, while those made by stacking mode did not presented any leakage. Scanning electron microscopy and optical microscopy were used to assess that diffusion bonding is a very suitable and promising technology for the fabrication of PHPs. The thermal tests showed that the grooved circular channel PHP presents higher thermal performance.
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Abbreviations
- CNC:
-
Computer numerical control
- \(D_{h}\) :
-
Hydraulic diameter (mm)
- FR:
-
Filling ratio (%)
- h-BN:
-
Hexagonal boron nitride
- H2SO4 :
-
Sulfuric acid
- Ke-V:
-
Kilo-electronvolt (J)
- PHP:
-
Pulsating heat pipe
- Q:
-
Heat load (W)
- R:
-
Radius (mm)
- \(R_{t}\) :
-
Total resistance (°C/W)
- SM:
-
Stop motion
- SO:
-
Stop-over
- STU:
-
Start-up
- \(\overline{T}_{e}\) :
-
Mean temperature at evaporator zone (°C)
- \(\overline{T}_{c}\) :
-
Mean temperature at condenser zone (°C)
- Tm :
-
Mean temperature (°C)
- SEM:
-
Scanning electron microscopy
- \(\overline{\Delta T}_{m}\) :
-
Mean difference of temperature (°C)
- \(\varepsilon\) :
-
Thickness (mm)
- \(\sigma\) :
-
Mean deviation
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Acknowledgements
The authors wish to acknowledge the help of all the members of the Heat Pipe Laboratory (LABTUCAL) at the Federal University of Santa Catarina. The authors would like to thank the LCME-UFSC for technical support during electron microscopy work; to LMP-UFSC for the profilometer measurements and the LABMAT-UFSC by the metallographic support. The authors especially thank Augusto José de Almeida Buschinelli, Mauro Mameli, Júlio César Passos, Leandro da Silva, Priscila Gonçalves, Bruna Coutinho and Gregori Rosinski for their advices and support. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brazil (CAPES)—Finance Code 001.
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Betancur-Arboleda, L., Hulse, P., Melian, I. et al. Diffusion-bonded pulsating heat pipes: fabrication study and new channel proposal. J Braz. Soc. Mech. Sci. Eng. 42, 466 (2020). https://doi.org/10.1007/s40430-020-02555-4
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DOI: https://doi.org/10.1007/s40430-020-02555-4