Ludovic Akasha Ets

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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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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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

mailto:[email protected]

mailto:[email protected]

Ludovic Akasha Ets

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