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Experimental Investigation on Mixing time Analysis of Jet Mixer

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Author Affiliations

  • 1Department of Chemical Engineering, EICT Polytechnic College, Tirupur-638 056 Tamilnadu, INDIA
  • 2 Department of Chemical Engineering, Kongu Engineering College, Perundurai-638 052 Tamilnadu, INDIA

Res. J. Engineering Sci., Volume 1, Issue (5), Pages 7-11, November,26 (2012)

Abstract

Fluids mixing can usually be achieved using mechanical mixers and jet mixers. Each of these mixers may be selected and used in order to provide optimal operative condition. However the jet mixing system is more effective than other mixing methods becausethey are very expensive for large storage tanks and underground tanks. Jet mixers are used in industrial applications primarily in unit processes where liquid blending, solids suspension, flow generation or chemical reactions are key process parameters. Mixing of reactants, catalysts etc. in a chemical and bio-chemical reactor can be achieved using a jet mixer, which offers the advantages of having no moving parts inside the reactor. For the design of jet mixers much experimental work has been done and many correlations have been proposed. However these correlations are case specific and not valid for generic mixer. The work reported in this paper are based on the use of hydrodynamic techniques to simulate jet mixing in a cylindrical tank with an aspect ratio (H/D) of 1.2. The flow circulation pattern within the tank and the effect of liquid flow rate on mixing of a soluble salt are studied. It can be seen that the nozzle diameter having 11% active area (10mm diameter) and jet position 30 cm above, from bottom of the tank shows shortest mixing time for Newtonian and non Newtonian fluids. An increase in the nozzle diameter was found to increase the mixing time at a given level of power consumption. The optimum nozzle diameter and jet position are not universal, it varies with tank geometry. The nozzle was placed at an angle of 900 throughout the studies. An empirical correlation has been developed

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