Abstract
We propose a convenient way of evaluating the mixing performance of static mixers used for round pipe by conducting flow visualization experiments under the turbulent region and using water as the main stream. A fluorescent pigment, glycerin, two carboxymethyl cellulose solutions, and rapeseed oil were each injected upstream of the mixer. Three static mixer conditions were tested: 1) no static mixer; 2) a Kenics-type static mixer; and 3) a multi-stacked elements (MSE) static mixer. The mixing trend downstream of the mixer in each condition and with each injection fluid was monitored using a laser and high-speed video camera system to obtain cross-sectional images. We propose suitable indexes based on the images obtained for quantitative evaluations of the mixing characteristics of static mixers.
Highlights
A static mixer or line mixer is a device designed to mix fluids inside a pipe
We propose a convenient way of evaluating the mixing performance of static mixers used for round pipe by conducting flow visualization experiments under the turbulent region and using water as the main stream
We examined two static mixers, and proposed suitable indexes obtained from the cross-sectional images that enabled quantitative characterization of mixing performance
Summary
A static mixer or line mixer is a device designed to mix fluids inside a pipe. Static misers are implanted in pipes, and can divide, shear, compress, and/or replace fluids passing over a short distance; they are considered space-saving equipment compared to a stirring vessel. Many types of static mixers are commercially available. Familiar static mixer providers include Kenics Co., Charles Ross & Son Co., and the Mixing Equipment Co. in the U.S and the Sulzer Co. in Switzerland [1] [2].
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