Combined static mixers for high viscous fluids mixing

Abstract

A new static mixer Cross-over-Disc has been invented to strip off the boundary layer and to make strong radial mixing. The pressure drop of Cross-over-Disc is 12—26 times as large as that of empty pipe with equivalent diameter and length. The mixing performance of Cross-over-Disc with 14 elements has been investigated in the viscosity range of 190—250 Pa•s by decoloration method, and the gray analysis of images shows that mixing inhomogeneity is about 7.5% and 9.4% for the mixing ratio of 5∶1 and 10∶1, respectively. Furthermore, mixing inhomogeneity for a combination of static mixing elements (four from Cross-over-Disc and three pairs from Sulzer-type) can be decreased to 2.1%—3.1% within a reasonable range of pressure drop.

Keywords

static mixer / Cross-over-Disc / pressure drop / mixing performance / high viscous fluid

References

[1] Hobbs D M, Muzzio F J. Reynolds number effects on laminar mixing in the Kenics static mixer. Chem Eng J, 1998, 70: 93-103

[2] Liu Z Y. Patent CN1490065, 2004-04-21

[3] Liu C J, Lu H B, Liu H, Yuan X G. Computational fluid dynamic simulation of the hydrodynamics characteristic in a static mixer. Journal of Tianjin University Science and Technology, 2007, 40(6): 677-682

[4] Shah N F, Kale D D. Pressure drop for laminar flow of non-Newtonian fluids in static mixers. Chem Eng Sci, 1991, 46: 2159-2161

[5] Hyun S S, Sang P H. A general correlation for pressure drop in a Kenics static mixer. Chem Eng Sci, 2005, 60: 5696-5704

RIGHTS & PERMISSIONS

Higher Education Press and Springer-Verlag Berlin Heidelberg