Author
Abstract
Laminar flow and heat transfer in annular passages with axially nonuniform inner tubes were obtained numerically. A characteristic feature of these passages is that the flow separates in a stream wise direction. An axisymmetric coordinate system with an algebraic transformation in the radial direction has been used. Fully elliptic vorticity-stream function and energy equations in the transformed coordinates are solved using an iterative alternate direction implicit (ADI) method. In an annulus with a smooth blockage, the flow separates immediately downstream of the blockage at a Reynolds number of (1000). The heat flux is high in the constricted region. An increase in the heat transfer occurs where the fluid reattaches itself to the wall.
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