Abstract
AbstractMixing in stirred tanks is vital to a wide range of industrial processes, typically requiring solids to be fully suspended and evenly distributed. The quality of suspension and mixing is typically measured visually. Such measurements are thus subject to human interpretation and can only feasibly be conducted in transparent systems – an uncommon condition in industrial systems. Visual measurements of homogeneity must also infer full 3D distributions of particles solely from the observation of a limited section thereof. This work details methods by which a system's homogeneity and state of suspension may be measured and quantified with no human interpretation, which can extract information from opaque systems and consider full 3D data acquired throughout the interior of a given system.
Highlights
1.1 Measuring Solids Suspension and Homogeneity in Stirred-Tank SystemsThe mixing of solids and liquids in stirred-tank systems is an important process widely used across a variety of industrial sectors [1,2,3,4]
Using data acquired via positron emission particle tracking, cloud height as a measure of homogeneity
If the judgment were based only on the point at which the occupancy, and solids fraction, reduces to approximately the case of optically opaque systems. These measures were used to explore how the Njs of a simple, fluid-immersed system of glass spheres varies with the Zwietering solids loading fraczero, it is likely that all systems in this tion X across a wide range of phase space 5 < X £ 60
Summary
1.1 Measuring Solids Suspension and Homogeneity in Stirred-Tank Systems. The mixing of solids and liquids in stirred-tank systems is an important process widely used across a variety of industrial sectors [1,2,3,4]. In many of these applications, e.g., wastewater treatment and fermentation [3, 5], it is desirable that all solids within the system are fully suspended, maximizing contact between the solid and liquid phases. In addition to potentially offering a more rigorous and unambiguous measurement of Njs (the method presented being fully algorithmic as opposed to relying on human interpretation), PEPT’s ability to probe opaque systems, objects, and fluids means that
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