Figure 11.

Variation of heat transfer coefficient as a function of distance for Al₂O₃–water and TiO₂–water nanofluids. Nanofluid concentration was 1 $\mathrm{wt} \%$, and the range of Reynolds number inside the microchannel was 150–200. The Al₂O₃ and Anatase TiO₂ nanoparticles were commercial.