Optimization of Integrated Impeller Mixer via Radiotracer Experiments

Abstract

Radiotracer experiments are carried out in order to determine the mean residence time (MRT) as well as percentage of dead zone, V dead (%), in an integrated mixer consisting of Rushton and pitched blade turbine (PBT). Conventionally, optimization was performed by varying one parameter and others were held constant (OFAT) which lead to enormous number of experiments. Thus, in this study, a 4-factor 3-level Taguchi L9 orthogonal array was introduced to obtain an accurate optimization of mixing efficiency with minimal number of experiments. This paper describes the optimal conditions of four process parameters, namely, impeller speed, impeller clearance, type of impeller, and sampling time, in obtaining MRT and V dead (%) using radiotracer experiments. The optimum conditions for the experiments were 100 rpm impeller speed, 50 mm impeller clearance, Type A mixer, and 900 s sampling time to reach optimization.

A Review of Progress and Hydrodynamic Design of Integrated Motor Pump-Jet Propulsion

“…2017 [39] The bearing capacity and service life of oil-lubricated bearings are higher than those of water-lubricated bearings.…”

“…The interaction of a yacht's duct and hull was investigated by Voith (2017) [39]. To optimize the structure and installation site of RDTs, it is critical to comprehend the interaction and nonlinear coupling between the wakefield, the RDT, and the hull.…”

“…The interaction of a yacht's duct and hull was investigated by Voith (2017) [39]. The gap-flow model has a minor effect on the overall hydrodynamic performance of the pump-jet propulsor's calculation findings, and its determined value is only slightly raised.…”

“…The interaction of a yacht's duct and hull was investigated by Voith (2017) [39]. The gap height should be 0.98-1.0 times the total gap height.…”

“…The interaction of a yacht's duct and hull was investigated by Voith (2017) [39]. Figure 8a depicts the RDT installation, while Figure 8b depicts the water flow pattern (b).…”