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Mixer Tank CFD Simulation

$85.00 $29.00

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In this project, a tank mixer is modeled and the effect of its rotating impeller on the mixing procedure is investigated.

This ANSYS Fluent project includes CFD simulation files and a training movie.

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Description

Mixer

In industry, mixing is an operation that involves the manipulation of heterogeneous materials with the intent to make them more homogeneous. Industrial Mixer is a machine that blends, homogenizes, and mixes different materials into a single substance. Mixers combine virtually any solid or liquid that is necessary to form the final product. Mixing is performed to allow heat and/or mass transfer to occur between one or more components or phases.

Modern industrial processing almost always involves some form of mixing as it is needed during the manufacturing or processing period. Their powerful motors and blades allow mixers to work with a variety of materials. These machines are widely used across many industries including pharmaceutical, chemical, agriculture, food, and beverage, etc.

Project Description

In this project, a tank mixer is modeled and the effect of its rotating impeller on the mixing procedure is investigated. The simulation is done using the VOF model for the three phases of air, water, and salt. The k-epsilon model is applied for solving the turbulent flow inside the tank. MRF model is also used to model the rotation of the impeller.

Mixer Geometry & Mesh

The geometry of this project includes a tank, a mixer consisting of a rod, and an impeller. The geometry is designed in ANSYS Design Modeler® and meshed by ANSYS Meshing®. The mesh type used for this geometry is unstructured and the total element number is 152641.

mixer mixer

mixer

Mixer CFD simulation

The assumptions considered in this project are:

  • Simulation is done using a pressure-based solver.
  • The present simulation and its results are considered to be steady and do not change as a function time.
  • The effect of gravity has been taken into account and is equal to -9.81 m/s2 in the Y direction.

The applied settings are recapitulated in the following table.

(Mixer) Models
Viscous model k-epsilon
k-epsilon model standard
near-wall treatment standard wall function
Multiphase VOF
Phase 1 Air
Phase 2 Water
Phase 3 Salt
(Mixer) Cell zone conditions
Rotating zone   MRF
Rotational velocity 10 rpm
(Mixer) Boundary conditions
Inlets Mass-flow inlet
Gauge total pressure 0 Pa
Salt inlet Direction specification method Normal to boundary
Mass flow rate 0.6 Kg/s
Gauge total pressure 0 Pa
Water inlet Direction specification method Normal to boundary
Mass flow rate 0.6 Kg/s
Outlets Pressure outlet
Gauge pressure 0 Pa
Backflow direction specification method Normal to boundary
Walls
wall motion stationary wall
(Mixer) Solution Methods
Pressure-velocity coupling Coupled
Spatial discretization pressure PRESTO!
Spatial discretization

 

Volume fraction Compressive
momentum second-order upwind
turbulent kinetic energy second-order upwind
turbulent dissipation rate second-order upwind
Initialization (Mixer)
Initialization method   Standard
gauge pressure 0 Pa
velocity (x,y,z) 0 m/s-1
Turbulent kinetic energy 1 m2/s2
Turbulent dissipation rate 1 m2/s3

Results

The contours of mixture density, mixture velocity, phase ID, and volume fractions of water, air, and salt are obtained.

All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.

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