Abstract
The Brownian motion of the nanoparticles in nanofluid is one of the potential contributors to enhance effective thermal conductivity and the mechanisms that might contribute to this enhancement are the subject of considerable discussion and debate. In this paper, the mixing effect of the base fluid in the immediate vicinity of the nanoparticles caused by the Brownian motion was analyzed, modeled, and compared with existing experimental data available in the literature. CFD was developed to study the effect of wall/nanoparticle interaction on forced convective heat transfer in a tube under constant wall temperature condition. The results showed that the motion of the particle near the wall which can decrease boundary layer and the hydrodynamics effects associated with the Brownian motion have a significant effect on the convection heat transfer of nanofluid.
Highlights
Fluid heating and cooling play significant roles in a lot of industrial processes such as refinery, petrochemical, power stations, and electronics [1]
The simulations for single and adjacent nanoparticles were discussed in detail
The results clearly indicated that microconvection/mixing induced by the Brownian motion of nanoparticles could significantly affect the macroconvective heat transfer capability of the nanofluids
Summary
Fluid heating and cooling play significant roles in a lot of industrial processes such as refinery, petrochemical, power stations, and electronics [1]. Sharma et al [14] experimentally studied the convective heat transfer coefficient and pressure drop in the transient region for Al2O3-water nanofluid under a constant heat flux. They found that convective heat transfer increases by adding Al2O3 nanoparticles in water. Moraveji et al [15] simulated water-Al2O3 nanofluid through a tube under a constant heat flux They found that the heat transfer coefficient rises by increasing the nanoparticle concentration and Reynolds number. The convective heat transfer near the wall region of the tube flow containing water and Al2O3 nanofluid under a constant temperature was simulated using the Computational Fluid Dynamics (CFD) tools. The effects of the nanoparticle Brownian motion on the convective heat transfer coefficient were investigated near the wall
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