In this paper the two-dimensional, non-isothermal fluid flow past a staggered tube bank is analyzed numerically by the finite element method. The flow is assumed to be incompressible, laminar and unsteady. To stabilize the discretized equations of the continuity and momentum, the streamline upwind/Petrov-Galerkin scheme is employed and the energy equation is solved using the Taylor-Galerkin method too. The computational domain for ten tubes in the direction of flow is meshed by using the four noded-quadrilateral elements. Equilateral-triangle (ET) tube pattern is considered for staggered tube bank. Reynolds numbers of 100, 200 and 300, Prandtl number of 0.71, and pitch-to-diameter ratios (PDR) of 1.25, 1.5 and 2.0 are chosen for the investigation. Having obtained the flow and the temperature fields, the local skin friction coefficient and the local Nusselt number are calculated for the tubes in the bundle at different times. A comparison of the results of the present study with the results of experiments of other investigators, for the steady-state case, shows good agreement between them.

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