期刊
NANOMATERIALS
卷 11, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/nano11040990
关键词
natural convection; heat transfer; water-based nanofluid; Brownian motion; porous medium; Darcy– Brinkman equation; numerical simulation
类别
资金
- National Nature Science Foundation of China [51706213]
The study reveals that Brownian motion, nanoparticle volume fraction, and porosity have significant impacts on the heat transfer rate, while nanoparticle diameter and radius ratio also influence the heat transfer rate.
Natural convection heat transfer in a porous annulus filled with a Cu nanofluid has been investigated numerically. The Darcy-Brinkman and the energy transport equations are employed to describe the nanofluid motion and the heat transfer in the porous medium. Numerical results including the isotherms, streamlines, and heat transfer rate are obtained under the following parameters: Brownian motion, Rayleigh number (10(3)-10(5)), Darcy number (10(-4)-10(-2)), nanoparticle volume fraction (0.01-0.09), nanoparticle diameter (10-90 nm), porosity (0.1-0.9), and radius ratio (1.1-10). Results show that Brownian motion should be considered. The nanoparticle volume fraction has a positive effect on the heat transfer rate, especially with high Rayleigh number and Darcy number, while the nanoparticle diameter has an inverse influence. The heat transfer rate is enhanced with the increase of porosity. The radius ratio has a significant influence on the isotherms, streamlines, and heat transfer rate, and the rate is greatly enhanced with the increase of radius ratio.
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