Computational Fluid Dynamics (CFD) is a branch of CAE (Computer-aided engineering), which simulates heat transfer and fluid motion by making use of numerical approaches.
By the CFD analysis one can achieve the higher level of accuracy, perfection and time saving in product making phase which exactly void or sometimes stabilize the argument on extravagant expenses it requires to spent on coz its ultimately lessen the physical trials taken by the manufacturer.
In most of the process industries mixing or blending of two or more fluid is common procedure and it’s a vast area for exploration.
We are here to discuss one of project of CFD Analysis done by AV Engineering Team on Water treatment plant where Neutralization involves adjusting the pH of a liquid to approach the “neutral” pH.
In this industry of Water Treatment, waste water which is generated from the regeneration of the resins used in anion, cation & mixed bed ion exchange systems. Those chemicals used to regenerate the resins have extreme pH levels.
The given model (Neutralization Pit) has been developed to mitigate the Industrial wastewater problem by controlling the pH value, solution of NaOH (base) and HCl (acid) has been used and to achieve optimum mixing of in large compartment, three educators have been utilized. The wastewater from compartment A is circulated to compartment B and/ C till desired pH value. The numerical analysis has been carried out to find out the mixing characteristics in neutralization compartment.
If we want to complete neutralization in a reasonable time then the acidic & alkaline waste volumes which are in the batch tank must be thoroughly mixed. We have several mixing approaches which we can apply.
given CASE, the compartment is filled with wastewater till 1.3 m. height and the flow is only in between compartment A and B/C, i.e. only three eductors are working.
To find out the mixing characteristics in neutralization compartment, two phase model has been utilized i.e. wastewater in tank 1 is phase 1 and wastewater coming into the compartment as phase 2. Therefore, the volume fraction of two phases in the compartment provides the mixing characteristics very well.
From this analysis to sum up, calculated flow rate has sufficient potential to deliver the required momentum for mixing. The given vertical position of all eductors is sufficient to provide the momentum transfer to bottom of the compartment in all CASES. And From observation, the overall mixing can be predicted to be more than 80 % of the compartment, neglecting corners.
By this analysis industries save themselves from Non-compliance fines and other consequences.
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