Axial dispersion in single-phase flow in pulsed packed columns

✍ Scribed by J.C. Göebel; K. Booij; J.M.H. Fortuin

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 687 KB
• Volume: 41
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(86)85057-6

✦ Synopsis

Axial dispersion in single-phase flow through a pulsed packed column (length 4 m; Raschig-ring packing) has been investigated using an imperfect pulse method. It has been shown that under certain conditions axial dispersion can be reduced by means of pulsation. A three-parameter model based on the Taylor-Aris dispersion equation for tube flow has been developed. This model, which has been verified experimentally, describes the relation between the axial dispersion coefficient and the interstitial and pulsation velocities. 1. INTRODUtXION flow then becomes An accurate description of the mixing in flowing systems of physical and chemical processes is required for designing large-scale equipment. For optimum operation of processes in columns, knowledge of the so-called axial dispersion is important because axial dispersion broadens the axial concentration profile, which generally results in a decrease in the perform- ance of both cocurrent and countercurrent process steps carried out in columns. Axial dispersion and its description are therefore relevant items for the design of each type of column.