Numerical investigation of nanofluids forced convection in circular tubes

By V. Bianco, F. Chiacchio, Oronzio Manca, Sergio Nardini. 2009

513 citations recorded by the source corpus.

Abstract In this paper, developing laminar forced convection flow of a water–Al2O3 nanofluid in a circular tube, submitted to a constant and uniform heat flux at the wall, is numerically investigated. A single- and two-phase model (discrete particles model) is employed with either constant or temperature-dependent properties. The investigation is accomplished for size particles equal to 100 nm. The maximum difference in the average heat transfer coefficient between single- and two-phase models results is about 11%. Convective heat transfer coefficient for nanofluids is greater than that of the base liquid. Heat transfer enhancement increases with the particle volume concentration, but it is accompanied by increasing wall shear stress values. Higher heat transfer coefficients and lower shear stresses are detected in the case of temperature dependents models. The heat transfer always improves, as Reynolds number increases, but it is accompanied by an increase of shear stress too. Moreover a comparison with data present in the literature is carried out.

Subfields: Biomedical Engineering, Computational Mechanics, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/c5ef75f4bcbb276d7e048e1029b94f9b4690898a

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In Biomedical Engineering

In Computational Mechanics

In Mechanical Engineering

Citations in the corpus

A critical synthesis of thermophysical characteristics of nanofluids (2011, background): “A large number of research work related to the heat transfer enhancement using nanofluids both experimentally and theoretically was conducted by a number of investigators [1–15].”
Radiation Effects on Mixed Convection over a Wedge Embedded in a Porous Medium Filled with a Nanofluid (2011, unknown): “[12], and Nield and Kuznetsov [13–17].”
Augmentation of the Heat Transfer Performance of a Sinusoidal Corrugated Enclosure by Employing Hybrid Nanofluid (2014, unknown): “(5) Equation (6) that is utilized for specifying heat capacity was first employed in [20] and then used inmany articles [22, 23, 25]:”
Eulerian–Eulerian two-phase numerical simulation of nanofluid laminar forced convection in a microchannel (2011, background): “…nanoparticle volume concentration distribution in the entrance region (Wen and Ding, 2004) and the homogeneous model under-estimates the observed heat transfer enhancement in the experiments (Heris et al., 2006; Behzadmehr et al., 2007; Bianco et al., 2009; Fard et al., 2010; Lotfi et al., 2010).”
Application of Computational Fluid Dynamics (CFD) for nanofluids (2012, result): “[82], results were put in comparison for single and two phase models.”