Power Consumption of Double-Bladed Kneaders of Various Shapes
The kneading process is widely used in various industries. When wet particles are mixed, the double-bladed kneader is one of the most useful instruments. We study the power consumption of a double-bladed kneader. The power is a very important factor in kneader designing and the examination of kneading conditions. In this paper, we propose an estimation method of the power consumption for double-bladed kneaders of various geometrical con-figurations based on the relation of the power number, <I>N</I><SUB>P</SUB>, and the modified Reynolds number, <I>Re</I>′. The influences of the vessel type, blade shape, wet particle volume and blade thickness on the power index, <I>β</I>, and the equivalent yield stress, (<I>τ</I><SUB>c</SUB>/<I>B</I>) were investigated. The influence of the geometrical configuration of a kneader on <I>β</I> and (<I>τ</I><SUB>c</SUB>/<I>B</I>) was explained using the dimensionless wet particle volume, <I>V</I>/<I>v</I>, and the dimensionless effective shearing area, <I>S</I>/<I>s</I>, respectively. These relations were correlated as a power expression. The equations obtained could be used to estimate the values of <I>β</I> and (<I>τ</I><SUB>c</SUB>/<I>B</I>) with errors of ±5% and ±10%, respectively. The applicability of these equations was examined in experiments using wet CaCO<SUB>3</SUB> particles and wet kaolin particles. Furthermore, in this study, the power consumption of various kneaders was estimated concretely. As a result, it was shown that the power consumption could be estimated with good accuracy.
- Journal of chemical engineering of Japan
Journal of chemical engineering of Japan 39(10), 1041-1049, 2006-10-01
The Society of Chemical Engineers, Japan