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Interfacial Phenomena and Heat Transfer
ESCI SJR: 0.258 SNIP: 0.574 CiteScore™: 0.8

ISSN Imprimir: 2169-2785
ISSN En Línea: 2167-857X

Interfacial Phenomena and Heat Transfer

DOI: 10.1615/InterfacPhenomHeatTransfer.2019030616
pages 19-31

EXPERIMENTAL STUDY ON POOL BOILING HEAT TRANSFER ENHANCEMENT WITH MICRO/NANOSTRUCTURED SURFACES

Yonghai Zhang
School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P.R. China; Shenzhen Research Institute of Xi'an Jiaotong University, Shenzhen, Guangdong, 518057, P.R. China
Bin Liu
School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P.R. China
Yongchen Liu
Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, P.R. China
Yang Yang
Technology and Engineering Center for Space Utilization, Chinese Academy of Sciences, Beijing, 100094, P.R. China
Jin-Jia Wei
School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P.R. China; Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong Uniersity, Xi'an, 710049, P.R.China

SINOPSIS

An experimental study of pool boiling heat transfer was conducted for two types of micro-pin-finned surfaces [staggered micro-pin-fins with dimensions of 30 × 30 × 60 μm3 (width × thickness × height, named PF30-60-60) and cylindrical micro-pin-fins with dimensions of 38 × 60 × 60 μm3 (diameter × pitch × height, named PF38-60-60)], a nanowire surface, and a TiO2 porous surface. The experimental conditions covered three different liquid subcoolings (15, 25, and 35 K), in which dielectric liquid FC-72 was used as the working fluid. Micro-pin-finned surfaces have strong liquid supply capacity and small flow resistance. Therefore, micro-pin-finned surfaces were observed to have much higher critical heat flux (CHF) than that of the smooth surface (Chip S). However, for the nanowire and TiO2 porous surfaces, their very small micro/nanostructures increased the liquid flow resistance and obstructed the liquid supplement. Therefore, their CHF enhancement was not obvious compared to that of Chip S. PF38-60-60 showed the best heat transfer performance, with over 120% increase in CHF compared to Chip S and the lowest superheat in the nucleate boiling heat transfer region. The micro/nanocavity diameter of the nanowire surface was consistent with the effective diameter of the nucleation sites. Therefore, an obvious increase in heat transfer coefficient was found. In contrast, the TiO2 porous surface did not improve the heat transfer coefficient significantly because the nanocavity diameter was too small and could not be effective in the nucleation sites.

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