Dimension (m)Depth of liquid H 1Diameter of tank Dt 1Height of turbine from base to tank C 0.35Height of turbine W 0.05Diameter of turbine Da 0.25

The Standard Agitation System

RatioDa/Dt 0.3-0.5C/Dt 1/3H/Dt 1W/Da 1/5

The geometric proportions of the agitation system, which are considered a typical standard design are given. These relative proportions form the basis of the major correlations of agitation performance from various studies. There are cases where W/DA = 1/8 and J/DT = 1/10 for some agitator correlations. Usually, 4 baffles are used and the clearance between the baffles and the wall is about 0.1–0.15 J. This ensures that the liquid does not form stagnant pockets between the baffle and the wall. The number of impeller blades varies from 4 to 16, but is generally between 6 and 8.

Design

In this design of mixer, the company uses cylindrical tank with dished surface. The bottom must round to eliminate sharp region into which the fluid current would not penetrate. Cylindrical tank has high stability than any other shape when filled with water. The inner area has arcs shape and it will divert the force of water during momentum.

They consider on using no baffle vessel in this design because of high viscosity of oil and water emulsification. It is not required to use baffle because the viscous shear is the sufficiently great to damp out the rotary motion.

Using conventional agitators a number of problems can be encountered which are hydrations of thickening and suspending agents is one of the most difficult of all mixing operation. Agglomerates can easily form and some ingredients require shear in order to develop their desired properties. When adding powdered ingredients to the vessel, partially hydrated materials can build up on the vessel wall and parts of the agitator. Agitators cannot easily form stable emulsions even when the oil and water phases have been heated. Long process times and additional equipment are often required to achieve a homogeneous product.

In this mixer, they use shrouded turbine as impeller. This turbine mounted on a vertical shaft with the stuffing box above the liquid. It is effective in fluids of high viscosity and agglomerate-free mix. It is also will produce consistent product and repeatability.