5-Mech -Ijmperd- Numerical - Morteza Piradl - Iran - Paid

Single-phase, periodically developed, constant property, laminar forced convection in two dimensional and sinusoidal corrugated ducts, which are maintained at uniform wall temperature, are considered. The governing differential equations for continuity, momentum, and energy transfer are solved computationally using finite-volume techniques, where the pressure term is handled by the SIMPLE algorithm. The computational grid is non orthogonal and non-uniform, and it is generated algebraically. All the dependent variables are stored in a non-staggered manner. Numerical solutions are obtained for different corrugation aspect ratios (γ=2A/L), plate spacing ratio (ε=S/2A), flow rates (Re) and different flow attack angles (φ). In corrugated ducts, the flow pattern changes drastically with Reynolds number and the flow gets separated at a critical Re. This is because the pressure distribution ceases to be linear and local variations of pressure cause flow to separate. The size of the separation region is seen to be a function of Re, γ and ε and it increases with increasing Re and γ. With increasing ε, however, it first increases and then starts to decrease after a critical ε is reached. This behavior is also seen in the friction factor and Nusselt number results, which increase to peak values corresponding to the critical ε value, and then begin to decrease. Both friction factor and Nusselt number results are presented for different γ and ε in the two-dimensional case, for a wide range of flow conditions (100≤Re≤1000), and for different flow attack angles (φ).