The jet shape of concentric mixers

In this paper, we present an analytical and experimental study of the mixin g region and jet shape in concentric mixers. Based on a simple but effectiv e analytical model, we are able to predict the growth of the mixing region with respect to downstream distance. An experimental study is conducted on the concentric mixing of paper fibre stock and water. By comparing with exp erimental results, we confirm that the shape of the mixing region is a prac tical indicator of mixing efficiency with the consideration of jet velocity and geometry including the nozzle wall thickness.