Figure 6.

Average Nusselt number comparison with the correlations proposed by Pak and Cho [19], Xuan and Li [20]and Maiga et al. [22]for (a) φ = 0%, (b) φ = 1%, (c) φ = 4% and (d) φ = 6%.

Bianco et al. Nanoscale Research Letters 2011 6:252   doi:10.1186/1556-276X-6-252
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