Abstract
Suddenly expanded flows find application in various engineering devices. The flow in the sudden expansion region is found to be affected by various factors. Passive control methods like protruding ribs are found to be very effective in the control of suddenly expanding flows. In the present study the effect of geometry of ribs on the flow characteristics is investigated computationally. The rib geometries studied are rectangular of two aspect ratios, circular, semicircular and triangular. The computational results show that rectangular rib of aspect ratio 3 significantly reduced the base pressure. The results compare very well with experimental results.
Highlights
Flow through suddenly enlarging passages is found in many industrial devices such as dump combustors, heat exchangers etc
The present work is aimed at finding out the influence of rib geometry on the suddenly enlarging flow
The protrusions used are named as ribs, this will be placed in the expansion passage lengthwise as shown in the diagram below (Figure 1)
Summary
Flow through suddenly enlarging passages is found in many industrial devices such as dump combustors, heat exchangers etc. Even though the configuration of such devices is simple the study of flow through them assumed lot of importance due to the complexities involved in such type of flows. Many studies both numerical and experimental have been carried out flows of such configurations. Scote et al.[1] numerically studied the laminar flow of Newtonian fluid in planar and axisymmetric sudden expansion bysolving the continuity and momentum Navier-stokes equations. Tao Tang and Ingham[2] investigated the steady incompressible laminar flow past a sudden expansion assuming twodimensional flow governed by the Navier-Stokes equations. The present work is aimed at finding out the influence of rib geometry on the suddenly enlarging flow
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