Geometrical Evaluation of a Pair of Elliptical Tubes Subjected to a Flow with Forced Convection Heat Transfer

Abstract:

In the present work it is performed a study on the geometric evaluation of a pair of elliptical tubes subjected to external flow with forced convection by means of numerical approach. The objectives are the maximization of Nusselt number (Nu_D) and the minimization of drag coefficient (C_D). The degrees of freedom for the pair of tubes arrangement are: the ratio between the transverse pitch and characteristic length of tubes (S_T/D), where D = (A)^1/2, the ratio of the main and secondary axes of the elliptical tube (a/b) and the angle of incidence of the flow on the pair of tubes (α). The simulations were carried out considering two-dimensional forced convective flows, in the laminar regime and incompressible conditions. For all configurations, Reynolds and Prandtl numbers are constant, Re_D = 100 and Pr = 0.71. The Finite Volume Method (FVM) is used to solve conservation equations of mass, momentum and energy. The software Gmsh is used for creation of the geometries and generation of the meshes. Results showed that the degrees of freedom affected the fluid dynamic and thermal performance of the forced convective flow. According to the objectives outlined in this study, the best performance for the maximization of heat transfer was obtained when α = 0o, a/b = 1⁄2 and S_T/D = 3.5. In the case of the fluid dynamics study, the optimal result for C_D minimization occurred when α = 0o, a/b = 2.0 and S_T/D = 4.0. Thus, the optimal geometry will depend on the indicator performance where the problem is evaluated.

• Periodical: Defect and Diffusion Forum (Volume 396)
• Pages: 155-163
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.396.155
• Online since: August 2019
• Authors: Ana Paula Del Aghenese*, Eliander Manke Heinemann, Gabriel de Avila Barreto, Filipe Branco Teixeira, Liércio André Isoldi, Luiz Alberto Oliveira Rocha, Elizaldo Domingues dos Santos
• Keywords: Elliptical Tubes, Forced Convection, Geometrical Evaluation, Numerical Approach

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