期刊
ENERGIES
卷 15, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/en15010372
关键词
alumina nanofluids; pool boiling heat transfer; bubble dynamics; biphilic surfaces; wettability
资金
- Fundacao para a Ciencia e Tecnologia (FCT) [JICAM/0003/2017, PTDC/EME-SIS/30171/2017, PTDC/EME-TED/7801/2020]
- FCT
- Instituto Superior Tecnico for the Scientific Employment [IST-ID/119/2018]
- Fundação para a Ciência e a Tecnologia [PTDC/EME-SIS/30171/2017, PTDC/EME-TED/7801/2020, JICAM/0003/2017] Funding Source: FCT
This study investigates the impact of alumina nanoparticle nanofluids on pool boiling performance and analyzes the possible effects of nanoparticles on boiling and heat transfer mechanisms. The optimal nanoparticle concentration was found to be 3 wt%, which significantly enhances heat transfer coefficients.
This work aims to study the impact of nanofluids with alumina particles on pool boiling performance. Unlike most studies, which use a trial-and-error approach to improve boiling performance parameters, this study details the possible effects of nanoparticles on the effective mechanisms of boiling and heat transfer. For this purpose, biphilic surfaces (hydrophilic surfaces with superhydrophobic spots) were used, which allow the individual analysis of bubbles. Surfaces with different configurations of superhydrophobic regions were used. The thermophysical properties of fluids only vary slightly with increasing nanoparticle concentration. The evolution of the dissipated heat flux and temperature profiles for a nucleation time frame is independent of the fluid and imposed heat flux. It can be concluded that the optimal concentration of nanoparticles is 3 wt%. Using this nanoparticle concentration leads to lower surface temperature values than those obtained with water, the reference fluid. This is due to the changes in the balance of forces in the triple line, induced by increased wettability as a consequence of the deposited particles. Wherefore, smaller and more frequent bubbles are formed, resulting in higher heat transfer coefficients. This effect, although relevant, is still of minor importance when compared to that of the use of biphilic surfaces.
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