Abstract
This work presents some comments concerning the paper entitled ‘Lattice Boltzmann simulation of alumina-water nanofluid in a square cavity’ by Yurong He, Cong Qi, Yanwei Hu, Bin Qin, Fengchen Li and Yulong Ding which was published in Nanoscale Research Letters in 2011. The comments are related to the numerical parameters and the computed results of average Nusselt number.
Highlights
The authors of ‘Lattice Boltzmann simulation of alumina-water nanofluid in a square cavity’ [1] have used the conventional lattice Boltzmann scheme to analyse the heat transfer and flow characteristics of Al2O3-water nanofluid in a square cavity
Numerical parameter The authors have carried out a grid independence test using three grid sizes of 1922, 2562 and 3002 to predict the average Nusselt number at Ra = 8 × 105 and 0% of volume fraction
Even though the authors have claimed that the Nusselt number decreases as the volume fraction increases, which was demonstrated in figure six of the said article, their results are still questionable since they have been computed using inappropriate grid sizes
Summary
The authors of ‘Lattice Boltzmann simulation of alumina-water nanofluid in a square cavity’ [1] have used the conventional lattice Boltzmann scheme to analyse the heat transfer and flow characteristics of Al2O3-water nanofluid in a square cavity. Numerical results The authors have stated that as the volume fraction is increased, the fluid becomes more viscous and the velocity of the flow in the enclosure decreases (page 7 of 8) At this point, the authors ignored the fact that the presence of nanoparticles stimulates the flow that resulted from high-energy transport through the flow associated with the irregular motion of nanoparticles [6,7,8]. The authors ignored the fact that the presence of nanoparticles stimulates the flow that resulted from high-energy transport through the flow associated with the irregular motion of nanoparticles [6,7,8] This behaviour leads the thermal boundary layer to become thinner and the Nusselt number to increase [9]. Even though the authors have claimed that the Nusselt number decreases as the volume fraction increases, which was demonstrated in figure six of the said article, their results are still questionable since they have been computed using inappropriate grid sizes
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