Laminar Forced Convection Heat Transfer Characteristics from a Heated Cylinder in Water Based Nanofluids

Forced convection heat transfer from a heated circular cylinder to incompressible water-based nanofluids in the steady cross-flow regime has been investigated numerically. The momentum and thermal energy differential equations have been solved by the standard finite volume method on the non-uniform Cartesian grid. The main objective of this study is to investigate the influence of the nanoparticles’ volume fraction (0 % ≤ φ ≤ 10 %) on the heat transfer characteristics of water-based nanofluids over a wide range of base-fluid Reynolds number (1 ≤ Rebf ≤ 20). Accurate numerical results are presented in the form of the local and mean Nusselt number and the heat transfer enhancement. The results indicate clearly that the heat transfer characteristics are affected by the base-fluid Reynolds number, volume fraction and the thermo-physical properties of nanoparticles. Although those nanofluids reduce the mean Nusselt number values, they enhance the heat transfer rate. (Received in November 2013, accepted in March 2014. This paper was with the authors 1 month for 1 revision.)

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