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7/30/2019 Ludovic Akasha Ets
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Ludovic® v5.4
Ludovic ® softwaresimulation of the corotating twin screw process and
optimization of the processed material
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Ludovic® is dedicated to thecororating twin screw extruders.
Ludovic® performs simulation of the material evolution during the extrusion process
Ludovic ® : simulating a process...
... for improving the productivity
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Ludovic ® : for corotating twin screw extrusion
Improvement of thematerial quality
Simulation of the process
Analysis
Comparison of configurations
Optimization of the process
Throughput increase
What you do... ... what you get
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Ludovic ® : a fast and robust model
Ludovic® performs simulation for the TSE process.
A simulation is a set of input data which is used to determine the history of thematerial data inside the extruder.
Input data
Screw geometries
Material Characteristics
Process conditions
φ ηScrew Rpm / material flow rate / T°C...
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Design of all manufacturers TSE
Ludovic® is able to design all extruders and screw geometries
Customizable screws Design of all screw profiles
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Simulating before acting
The Ludovic® simulation gathers all the data dealing with the TSE process
Geometry definitionExtruder characteristics
Screw elements definition
Material CharacteristicsThermal characteristicsViscosity
Process conditionsThermal parametersScrew rotation speed Material flow rate
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Analysing the process
The Ludovic® simulation provides 3 kind of results :
1. F( x ) results
2. Global Results
3. RTD Results
Distribution of thermo-mechanicalresults along the screw profile
Values of the global systemfunctioning
Distribution of the ResidenceTime
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1. Analysing the results – F(X) Results
The distribution of thermo-mechanical results along the screw profile : Ludovic® displays with accuracy results which are not otherwise easy to acquire.
The Results
Distribution of thermo-mechanicalresults along the screw profile
TemperaturePressureViscosityShear RateFilling ratio
Dissipated energy...
Distr ibution of thermo-mechanical results along the screw profile
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2. Analysing the results – Global Results
Ludovic® computes a balance of the global system state : how is the energy utilizedthat you provide as input the extruder?
The Results
TorqueEngine power SMEEnergies...
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3. Analysing the results - Residence Time Distribution
Ludovic® is a convenient tool to measure the Residence Time.
The RTD is an efficient result to quantify the mixing efficiency of the process.
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Design Of Experiments (DOE)
Virtual Designs of Experiments allow to analyse a whole functioning domain for aconfiguration range of a TSE.
Advanced tools
Evolution of the RTD takinginto account the screw
rotation speed and thematerial flow rate
Evolution of the dissipatedenergy taking into accountthe screw rotation speedand the material flow rate
Principles
The DOE allows to observe the impactof the parameters variation on theprocess/material behaviour.
A range of variation for differentparameters is defined in Ludovic. In thiscase we observe the variation of thescrew rotation speed and the materialflow rate.
As a result, we analyze the impact of those coupled variations on the relevantvalues for the process/materialevolution.
Residence Time
Dissipated Energy
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Comparison of simulations
Thanks to an integrated environment, Ludovic®
holds lots of tool to analyse,optimize and compare the different simulations and their results.
Advanced tools
Comparison
The simulations comparison allows toanalyze different configurations of screw
designs/process conditions.
In this example, we have different sets of process conditions (material flow rate,screw rotation speed, thermalregulation...).
We compare their impact on the RTD(the upper picture) and the temperature
(the bottom window).
At a glance, it is easy to identify theconfiguration which fits to the materialrequirements/targets.
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Trends analysis
The Trends analysis is an integrated statistical which highlights the correlationbetween observed results and process parameters.
Advanced tools
Trends
A specific tab is dedicated to therelationship between results and
parameters.
Through a statistical model, it computesthe correlation link between the resultscomputed by Ludovic® and theparameters defined by the user.
It means that it gives to the users a wayto plan the reaction of the
machine/material regarding to itschoices in terms of processconditions/variations.
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Ludovic ® : a fast and robust model
Ludovic® is based on a 1D model
FastMultipurposeReliable
Less than 1min computationFor all kind of TSEVery good agreement between simulations and experiments
Thermo-mechanical flow
Ludovic® solves the physics equations of the flow, based on the geometricaldiscretization of each screw elements as « C Chambers ».
Each screw element is discretizedas a C chamber where thecomputation of the flow takesplace
The model
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Example : testing the sensitivity of the material
Through the POE, we test the sensitivity of the material regarding to the variation of process conditions. Target : optimizing the output while saving the mixing efficiency
Applications
Range of variation
Screw rotation speed : [250;800] rpmFlow rate : [500;1000] kg/h
Ludovic ® sweeps and matches all the values
to design a complete Design of Experiments.This DOE underlines the functioning limits of the TSE configuration.
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Example : testing the sensitivity of the material
As a result, Ludovic® proposes :3D curves : to analyse the global sensitivity of the materialClassic curve : for the analysis of a given value (of a parameter)Table : for a statistical analysis
Applications
Evolution of the mean residence time, taking into account the variation of screw rotation speed and flow rate
Evolution of the mean residence time taking into account theflow rate evolution for a rotation speed fixed at 450 rpm
Global table of all the DOE values
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Example : testing the sensitivity of the material
The 3D curve describes the complete functioningdomain.
But it is possible to add criterions to limit the functioningdomain taking into account our production conditions.
In our example, the polymer we use is sensitive to thehigh temperature. So we determine a max. temperature
at 270°C
We also decide to limit the Residence time to avoidhigh pressure and temperature in the extruder. Themax. residence time is fixed at 25s.
By fixing those criterions, we limited the functioningdomain to specific areas.The red part of the 3D curves mean that the functioningconditions are out of our criterions.The green part fits to our requests. In this functioningdomain, we optimize the ouptuts without degrading thematerial.
Applications
Complete functioning domainEvolution of the mean residence time, taking into account thevariation of screw rotation speed and flow rate
Restricted functioning domain (with application of criterions)Evolution of the mean residence time, taking into account thevariation of screw rotation speed and flow rate
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Ludovic ®
Background
Conclusion
Software editorSCC is a french company specializedin the development/edition of numerical simulation software for
material processings
R&D BackgroundThe CEMEF is a french reknownedlaboratory. It depends from Mines
ParisTech and is specialized in thenumerical issues of materialtransformation.
DistributorAkasha Enterprises is the exclusivedistributor of the Ludovic® softwarefor the Indian market. It is also incharge of the 1st level of technicalsupport of the Ludovic® software.
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For more information
Conclusion
Do not hesitate to contact Akasha Enterprises for all the questions you might have :
AKASHA ENTERPRISES11/1, Mosque Road,Aramane Nagar,BANGALORE – 560003 . India
Phone : +91 961 124 13 45Email : [email protected]
Web : http://www.akasha.co.in