Prediction of laminar flow and heat transfer in axially non-uniform inner annuli

Abstract EN

Laminar flow and heat transfer in annular passages with axially no uniform inner tubes were obtained numericaUy.

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 a reattaches itself to the wall.