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. 2020 Nov 25;6(11):e05568. doi: 10.1016/j.heliyon.2020.e05568

Figure 9.

Figure 9

Variation of average Nusselt number with nanoparticles volume fractions for inner cylinder (I. C.) and outer cylinder (O. C.) for eight models of corrugated annuli at different Rayleigh numbers.