Abstract
Submerged recirculating jet mixing systems are an efficient and economical method of agitating large tanks with a high hydraulic residence time. Much work has been carried out in developing design correlations to aid the predictions of the mixing time in such systems, with the first such correlation being developed nearly 70 years ago. In most of these correlations, the mixing time depends directly on the volume of the vessel and inversely on the injection velocity of the submerged jet. This work demonstrates, for the first time, that the distance between the injection and suction nozzles also significantly affects the mixing time and can be used to control this time scale. The study introduces a non-dimensional quantity that can be used as an adjustable parameter in systems where such control is desired.
Highlights
Jet mixing is a single-phase mixing process, whereby a high velocity jet of fluid entrains the surrounding fluid, creating a mixing layer at the jet boundary
Jet mixing is commonly employed in large-scale tanks where the required blend time of the tanks is more in the order of hours rather than minutes or seconds
This study has shown that in vessels using submerged recirculating jets for agitation purposes, the distance between the suction and injection ports can be used to control the mixing time, for the same value of injection velocity and when the liquid properties are kept constant
Summary
Jet mixing is a single-phase mixing process, whereby a high velocity jet of fluid entrains the surrounding fluid, creating a mixing layer at the jet boundary. Jet mixing is commonly employed in large-scale tanks where the required blend time of the tanks is more in the order of hours rather than minutes or seconds. Jet mixing is ideal for anaerobic digesters, fuel storage tanks, etc. With hydraulic retention times in the order of days. As jet mixing does not require any moving parts inside the mixing tank, it is easy to maintain, and considered more economical than other forms of mixing . (The nomenclature used in this article is provided in table 1.).
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