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多相流动科学与技术
SJR: 0.153 SNIP: 0.222 CiteScore™: 0.26

ISSN 打印: 0276-1459
ISSN 在线: 1943-6181

多相流动科学与技术

DOI: 10.1615/MultScienTechn.2018024685
pages 135-152

INVESTIGATION OF NATURAL CONVECTION CHARACTERISTICS WITH BROWNIAN MOTION EFFECT USING DIFFERENT NANOFLUIDS

Saleh Etaig
Mechanical Engineering Department, University of Benghazi, Benghazi. Libya; Mechanical and Construction Engineering Department, Newcastle, UK
Reaz Hasan
Mechanical and Construction Engineering Department, Northumbria University, Newcastle, United Kingdom
Noel Perera
Mechanical and Construction Engineering Department, Northumbria University, Newcastle, United Kingdom

ABSTRACT

This paper reports the effect of Brownian motion on fluid flow and heat transfer performance using various nanofluids in natural convection in a square enclosure. The energy and Navier–Stokes equations are solved numerically using a finite-volume approach. The effect of Brownian motion was employed based on a thermal conductivity model with a Brownian motion effect. The effect of the volume concentration on the enhancement of heat transfer was studied incorporating the Brownian motion. The influence of the effective thermal conductivity on the enhancement was also investigated for a range of volume fraction concentrations. Various volume concentrations were tested in the present study: 2%, 3%, 4%, and 6%. Different Raleigh numbers were investigated for different nanoparticles. The results revealed that an increase in the volume fraction deteriorates the heat transfer. The velocity gradients were also found to be affected by the volume fraction. The temperature profile for different Rayleigh numbers is presented. Three different nanofluids (Cu–water, TiO–water, and AL2O3–water) were studied.


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