DOI: 10.1016/j.scib.2021.05.019
论文题名: Role of trapped liquid in flow boiling inside micro-porous structures: Pore-scale visualization and heat transfer enhancement
作者: Hu H. ; Jiang P. ; Huang F. ; Xu R.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2021
语种: 英语
中文关键词: Film flow
; Flow boiling
; Heat transfer enhancement
; Liquid bridge
; Micro-porous structure
; Trapped liquid
英文摘要: Flow boiling is an important heat dissipation method for cooling high heat flux surfaces in many industrial applications. The heat transfer can be further enhanced by using porous media surfaces due to their high specific surface areas. However, although flow boiling in channels is well understood, the phase-change behavior with the additional capillary effect induced by the porous structures is not well understood, and the design of the porous structures is difficult to avoid dryout and over-temperature accidents. A pore-scale lab-on-a-chip method was used here to investigate the flow boiling heat transfer characteristics inside micro-porous structures. The flow patterns, captured in the two-phase region with a uniform pore-throat size of 30 μm, showed that liquid was trapped in the pore-throat structures as both dispersed liquid bridges and liquid films. Moreover, the liquid film was shown to be moving on the wet solid surface by laser-induced fluorescence and particle tracking. A theoretical analysis showed that the capillary pressure difference between adjacent liquid bridges could drive the liquid film flows, which helped maintain the coolant supply in the two-phase region. The pore-throat parameters could be designed to enhance the capillary pressure difference with multiple throat sizes of 10 – 90 μm which would enhance the heat transfer 5% – 10% with a 5% – 23% pressure drop reduction. This research provides another method for improving the flow boiling heat transfer through the porous structure design besides changing the surface wettability. © 2021 Science China Press Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170267
Appears in Collections: 气候变化与战略
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作者单位: Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China
Recommended Citation:
Hu H.,Jiang P.,Huang F.,et al. Role of trapped liquid in flow boiling inside micro-porous structures: Pore-scale visualization and heat transfer enhancement[J]. Science Bulletin,2021-01-01