Boiling Heat Transfer Performance of Parallel Porous Microchannels

Donghui Zhang, Haiyang Xu, Yi Chen, Leiqing Wang, Jian Qu, Mingfa Wu and Zhiping Zhou
Additional contact information
Donghui Zhang: School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212001, China
Haiyang Xu: School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212001, China
Yi Chen: School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212001, China
Leiqing Wang: School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212001, China
Jian Qu: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212001, China
Mingfa Wu: School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212001, China
Zhiping Zhou: School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212001, China

Energies, 2020, vol. 13, issue 11, 1-17

Abstract: Flow boiling in microporous layers has attracted a great deal of attention in the enhanced heat transfer field due to its high heat dissipation potential. In this study, flow boiling experiments were performed on both porous microchannels and a copper-based microchannel, using water as the coolant. As the heat flux was less than 80 W/cm 2 , the porous microchannels presented significantly higher boiling heat transfer coefficients than the copper-based microchannel. This was closely associated with the promotion of the nucleation site density of the porous coating. With the further increase in heat flux, the heat transfer coefficients of the porous microchannels were close to those of the copper-based sample. The boiling process in the porous microchannel was found to be dominated by the nucleate boiling mechanism from low to moderate heat flux (<80 W/cm 2 ).This switched to the convection boiling mode at high heat flux. The porous samples were able to mitigate flow instability greatly. A visual observation revealed that porous microchannels could suppress the flow fluctuation due to the establishment of a stable nucleate boiling process. Porous microchannels showed no advantage over the copper-based sample in the critical heat flux. The optimal thickness-to-particle-size ratio ( ? / d ) for the porous microchannel was confirmed to be between 2–5. In this range, the maximum enhanced effect on boiling heat transfer could be achieved.

Keywords: porous microchannel; flow boiling; heat transfer; pressure fluctuation; pressure drop (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
https://www.mdpi.com/1996-1073/13/11/2970/pdf (application/pdf)
https://www.mdpi.com/1996-1073/13/11/2970/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:13:y:2020:i:11:p:2970-:d:369422

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().