Unveiling the fundamentals of flow boiling heat transfer enhancement on structured surfaces.

Autor: Inanlu MJ; Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA., Ganesan V; Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA., Upot NV; Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA., Wang C; Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA., Suo Z; Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA., Fazle Rabbi K; Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA., Kabirzadeh P; Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA., Bakhshi A; Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA., Fu W; Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA., Thukral TS; Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA., Belosludtsev V; Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA., Li J; Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA.; School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China., Miljkovic N; Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA.; Department of Electrical and Computer Engineering, University of Illinois, Urbana, IL 61801, USA.; Materials Research Laboratory, University of Illinois, Urbana, IL 61801, USA.; International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka Nishi-ku, Fukuoka 819-0395, Japan.; Institute for Sustainability, Energy and Environment (iSEE), University of Illinois at Urbana-Champaign, Urbana, 61801 IL, USA.
Jazyk: angličtina
Zdroj: Science advances [Sci Adv] 2024 Nov 08; Vol. 10 (45), pp. eadp8632. Date of Electronic Publication: 2024 Nov 08.
DOI: 10.1126/sciadv.adp8632
Abstrakt: Micro- and nanostructured surfaces offer the potential to enhance two-phase heat transfer. However, the mechanisms behind these enhancements are not well-understood due to insufficient diagnostic methods, leading to reliance on trial-and-error surface development. We introduce in situ boroscopy to investigate microscale bubble dynamics during flow boiling nucleation and subsequent flow regime development. This method was applied in saturated flow boiling experiments within chemically etched aluminum and copper tubes. Although the surfaces have self-similar surface structures, our findings revealed varied heat transfer coefficient enhancements, with increases of up to 391% on aluminum and 41% on copper. Using boroscopy, we identified key mechanisms of heat transfer enhancement. We further used mercury porosimetry to determine the impact of pore size distribution on thermal performance. The boroscopy technique introduced here not only elucidates the underlying processes of flow boiling heat transfer enhancement but also has potential applications for the study of other two-phase phenomena.
Databáze: MEDLINE