Laminar Flow Patterns in Two Dimensional, Suddenly Expanded Conduits and Influence of Temperature on Them

Abstract

Water was fed down into vertically supported, two-dimensional, discontinuously diffusing conduits. Reynolds numbers were taken to be low enough to keep flows within laminar regions. The results obtained are as follows. (1) For Reynolds numbers higher than a certain critical value, the Coanda effect occurs even if flows are laminar. (2) When the temperature difference between a reattached wall and water exceeds a certain value, a flow pattern changes into one in which the jet attaches to the opposite wall. (3) In an asymmetrically expanded duct, two different kinds of steady and stable flow patterns can be obtained.