HEAT TRANSFER AND FLUID FLOW ANALYSIS FOR AN ARRAY OF INTERRUPTED PLATES, POSITIONED OBLIQUELY TO THE FLOW DIRECTION
Periodic fully developed heat transfer and fluid flow characteristics for laminar flow through an array of plate segments, positioned at an arbitrary angle to the flow direction, were determined from the numerical solutions of the conservation equations. The numerical methodology was based on an algebraic coordinate transformation technique which mapped the complex computational domain onto a rectangle.
The results were obtained for uniform wall temperature, for a range of Reynolds number, Prandtl number, and for several values of dimension less geometrical parameters characterizing the plate angle from the streamwise direction, the plate length, and the transverse spacing between the plates. As seen from the streamline plots, the flow patterns are highly complex including large separation zones at high values of Reynolds number. The separation and the stagnation points change position with an increase in Reynolds number but the reattachment point does not change position and is always near the end of the plate. Moderate enhancement in the Nusselt number results occurred with a pressure drop penalty, when compared with the corresponding values for a straight duct, at high values of Reynolds number, Prandtl number, plate angle, plate length, and at low values of the transverse spacing between the plates. Finally, from a performance analysis results, it was shown that the difference in the heat transfer rate ratios, under three different constraints, decreases with increasing aspect ratio and increasing plate angle.