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Proceedings of Symposium on Energy Engineering in the 21<sup>st</sup> Century (SEE2000) Volume I-IV

ISSN:
1-56700-132-7 (Print)

NUMERICAL PREDICTION OF CONVECTIVE HEAT TRANSFER AND SECONDARY FLOW CHARACTERISTICS IN A CURVED RECTANGULAR DUCT WITH CONCAVE HEATING

Tilak T. Chandratilleke
Department of Mechanical Engineering, Curtin University of Technology, GPO Box U1987, Perth WA6845, Western Australia

Nursubyakto
School of Mechanical Engineering, Curtin University of Technology GPO Box U1987, Perth WA6845, Western Australia

Ala Altraide
School of Mechanical Engineering, Curtin University of Technology GPO Box U1987, Perth WA6845, Western Australia

Abstract

A numerical simulation is developed to examine the secondary flow characteristics in a curved rectangular duct with external heating on the concave wall of the duct. The general governing equations of momentum, mass continuity and energy of the flow are non-dimensionalised and transformed into vorticity-stream function formulation. The equations are discretised using finite volume method and the dynamical variables are defined on a stagger grid. The resulting penta-diagonal system of linear algebraic equations is solved using Strongly-Implicit-Procedure. Numerical simulation is performed on ducts of aspect ratios between 1 to 8 and selected curvature. The external wall heating is varied up to 200 W/m2 and the numerical solutions are obtained for Dean number ranging from 20-500. Results are presented to illustrate the effects of Dean number, aspect ratio, buoyancy force and external heating on the flow parameters.