Figure 6.

Effect of nanoparticle's diameter on the Nusselt number for. (a) 1% volume concentration, (b) 2% volume concentration, (c) 3% volume concentration, and (d) 4% volume concentration of Al2O3 nanofluids.

Zeinali Heris et al. Nanoscale Research Letters 2011 6:179   doi:10.1186/1556-276X-6-179
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