화학공학소재연구정보센터
International Journal of Heat and Mass Transfer, Vol.126, 521-535, 2018
Constructal Design of triangular arrangements of square bluff bodies under forced convective turbulent flows
Present numerical work consists on geometric evaluation of turbulent, transient, two-dimensional, incompressible and forced convective flows over triangular arrangements of square bluff bodies of size D employing Constructal Design. The main purpose is to evaluate the influence of the geometry of the arrangement over drag coefficient (C-D) and Nusselt number (Nu(D)), i.e., multiobjective problem. It is also investigated the influence of array configuration over fluid dynamic and thermal behavior of the flow. The problem has two constraints: cross-sectional area of bodies (3D(2)) and occupation area of the array (6D x 6D) and two degrees of freedom: S-L/D and S-T/D (ratios between longitudinal and transversal pitchs and size of the bodies). For all simulations, Reynolds and Prandtl numbers are constant (Re-D = 22,000 and Pr = 0.71). Time-averaged conservation equations of mass, momentum and energy are solved with Finite Volumes Method. Closure of turbulence is solved with RANS SST - kappa-omega modeling. Results showed a strong influence of design over fluid dynamic and thermal performance of the problem, as well as, multiplicity of scales and patterns of turbulent flows. Moreover, the optimal multi-objective configuration was the same reached for fluid dynamic purpose, showing the dominance of this purpose in the present investigation. (C) 2018 Elsevier Ltd. All rights reserved.