Mixing Tank Design Criteria

Mixing is an essential operation in many fields of engineering. It has central significance in food processing, pharmaceutical manufacturing, chemical engineering, biotechnology, agrochemicals, dye production, and water purification among countless other applications. Many mixing schemes using mixing tanks have been developed to meet various production and processing objectives. In agricultural systems, a mixing system is used in a number of processes, such as the preparation of chemical concentrations, balancing the amounts of nutrients in fertilizer tanks, blending various materials, and processing farm products.

How does a mixing tank work?

A mixing tank works by releasing bubbles in sequence at regular intervals and that’s why mixing tank design is so important. This creates immediate vertical circulation in the container and mixes 100% of its contents. The sudden release of air shocks the fluids, propelling the fluid molecules into motion.
Agitator manufacturers are frequently required to provide the customer with equipment designed according to specific process specifications. This work demands a good understanding of mixing and the consequence of the proposed equipment in the process. The designer must define in detail the mechanical specifications of the stirrer and vessel. In summary, the customer expectation is a mechanical specification of the vessel and a good understanding of the mixing influence on the process.
A good practice during the equipment design stage is to maintain continuous contact with the customer regarding to the process and the equipment they expect to buy. With VisiMix, the agitator manufacturer has an opportunity to demonstrate to his customer the influence of the equipment in the process (turbulent and laminar regimes) through VisiMix reports, including calculations of:
 Blending
 Suspension
 Dissolution
 Emulsification
 Gas dispersion
 Heat transfer
 Chemical reactions
 Mechanical stability of shafts

Once the mixing characteristics of the process are analyzed by the customer and after his agreement, the agitator manufacturer can proceed to calculate the mechanical parameters.
After understanding the mixing parameters well, it is possible to determine the simple mixing parameter used in calculating mechanical parameters in software like Agitation Intensity. If one assumes agitation intensity to be proportional to the rate at which a specific tank contents are turned, then intensity would vary linearly with the fluid velocities in the tank. Such a criterion suggests that the range from mild to violent intensity be defined by average bulk fluid velocities, which are designated on a scale from 1 to 10. With VisiMix, you calculate this velocity and feed this into the corresponding Agitation Intensity mechanical parameter calculation.
Some companies provide mechanical parameters calculation of the agitator and vessel according to process requirements after the mixing influence is understood. CerebroMix is an intuitive, easy-to-use software package for the design of vertical or horizontal tanks with agitation. It designs and calculates the specifications for commercial mixing tanks operating in both turbulent and laminar regimes. The reports issued include all dimensional and volumetric characteristics of the mixers, schematic drawings, and the development of plates from stock material.
Some of the features of the software are:

 Contains ASME material database
 Presents schematic drawings
 Generates technical specifications
 Multi-language software: English, Spanish, and Portuguese
 Fast response to the user
 Reliable results
 Procedure standardization
 Cost estimation
 Economic and safe operation
 Generates reports in MS-Word file (.doc)

VisiMix Video

The Influence of Mixing in the Process
New methodology using VisiMix software for the purpose of checking the influence of mixing in the processes.

VisiMix Demo Operation
Learning how to input data into the VisiMix software and get results the will help us understand the influence of mixing in our processes.

Lab Experiments
Learning how to set up the relevant experiments at the lab scale, to develop the processes from an engineering point of view.