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Visual Cue Narration
Slide Number 1

Title Slide

Welcome to this tutorial on Creating a Material Stream in DWSIM.
Slide Number 2

Learning Objective

In this tutorial, we will learn to:
  • Select Chemical compounds
  • Define a Thermodynamic package
  • Choose Units and Values and
  • Specify a Material stream
Slide Number 3

System Requirements

This tutorial is recorded using
  • DWSIM version 5. 8 (Classic UI) Update 3 and
  • Windows 10 OS

But, this process is identical in Linux, Mac OS X or FOSSEE OS on ARM.

Slide Number 4


You should have DWSIM installed on your machine.
Let us start by creating a new steady state simulation.
Cursor to Desktop

DWSIM >> Run as Administrator.

To open DWSIM, go to the Desktop.

Right-click on DWSIM and click Run as Administrator.

DWSIM window opens. DWSIM window opens.
Close the Tasks window. Close the Tasks window.
File >> New Steady-state Simulation Go to File menu and select New Steady-state Simulation.
Cursor to Simulation Configuration Wizard window Simulation Configuration Wizard window opens.
Click on Next button at the bottom. Click on the Next button at the bottom of the window.
First, we will add the compounds.
Type Benzene in the search tab In the Compounds Search tab, type Benzene.
ChemSep Database >> Benzene Select Benzene from ChemSep database.
Point to Benzene compound

Check the checkbox under column Added

Under Added column, check the checkbox for Benzene.

We can also double-click anywhere on this line.

Type Toluene in the search tab Similarly, add Toluene from ChemSep database.
Click on Next button at the bottom. Then click on Next button at the bottom to continue.
Point to Property Packages The Property Packages window opens.
Cursor on Property Packages window. As Benzene and Toluene form an ideal solution, we can choose Raoult's law.
Property Packages >> Available Property Package

Double click on Raoult’s Law

From Available Property Packages list, double-click on Raoult’s Law.
Click on Next button. Now click on the Next button at the bottom.
Point to System of Units Next option is System of Units.
System of Units >> CGS Under System of Units, we will select CGS.
Click on the Finish button. Then click on the Finish button at the bottom.
Click on Maximize button. Let us maximize the Simulation window.
Hover the mouse at the centre The canvas at the centre is used to create the flowsheets.

We will now create a material stream.

Hover the mouse at Object Palette At the bottom of the main simulation window, we can see an Object Palette.

It has a large collection of many useful chemical engineering objects.

Click and drag material stream to flowsheet Go to Streams tab.

From the displayed list, drag and drop a material stream to the flowsheet.

Cursor at the stream. Let us arrange the stream.
Click on MSTR-000.

Pop up appears.

Click on the material stream named as MSTR-000.

DWSIM has given the name MSTR-000 to this stream automatically.

Let me change it.

Hover the mouse to Property Editor Window On the left hand side of the flowsheet we can see the Property Editor Window.
Type Object as Inlet1. Under General Info, type the Object as Inlet1.

Press Enter.

Point to the Material Stream We can see the name Inlet1 appearing below this stream in the flowsheet.
Cursor on the interface. Now let us specify the feed stream compositions.
Input Data >> Compound Amounts Under Input Data, click on Compound Amounts tab.
Compound Amounts >> Basis >> Mole Fractions Choose the Basis as Mole Fractions, if not already selected.

By default, Mole Fractions is selected as Basis.

Benzene: 0.4 Now for Benzene, enter the Amount as 0.4 and press Enter.
Toluene: 0.6 For Toluene, enter 0.6 and press Enter.
Click Accept Changes On the right, click on Accept Changes button.
Hover the mouse at Total The total of the mole fractions appears on the right hand side.

If the total is not 1, DWSIM normalises the entries, so that the total becomes 1.

Cursor on the interface. Now we will specify the Feed stream properties.
Point to Input Data

Cursor to the default values

The Input Data tab shows all the properties of the stream.

DWSIM assigns default values to all properties.

Click on Input Data. Go to Input Data.
Stream Conditions >> Flash Spec >> Temperature and Pressure (TP) Under Stream Conditions tab, select Flash Spec as Temperature and Pressure (TP) if not already selected.

By default, Temperature and Pressure should already be selected as Flash Spec.

Input Data >> Temperature >> 30 C

Press Enter

Change Temperature to 30 deg C and press Enter.
Input Data >> Pressure >> 1 atm

Press Enter

Change Pressure to 1 atm and press Enter.
Input Data >> Molar Flow >> 100 mol/s

Press Enter

Change Molar Flow to 100 mol/s and press Enter.
Click on File and Click Save As Let us now save this file using the Save As option.
Type stream I will save it as stream.
Close the Property Editor Window. Close the Property Editor Window.
Click on the Material Stream We can always get back to the previous pop-up by double-clicking on the stream.
We will build on this material stream in the upcoming tutorials.
Let me go back to the slides.
Let's summarize.
Slide Number 5


In this tutorial, we have learnt to
  • Select Chemical compounds
  • Define a Thermodynamic package
  • Choose Units and Values and
  • Specify a material stream
Here are some assignments for you.
Assignment 1 Slide Choose Benzene and Toluene mole fractions that do not add up to 1.

Check how DWSIM normalises when you press Accept Changes button.

Assignment 2 Slide Go to the page where you defined mole fractions.

Check what the Normalize button does when the Total is not 1.

Assignment 3 Slide Go to the page where we defined the molar flow rate.

DWSIM automatically displays equivalent flow rates in other units.

Check if these values are consistent.

Assignment 4 Slide Create a stream consisting of Benzene, Toluene and Xylene.

Carry out the previous assignments for this stream also.

This brings us to the end of this tutorial.
Slide Number 6

About the Spoken Tutorial Project

Watch the video available at the following link.


It summarizes the Spoken Tutorial project.

Slide Number 7

Spoken Tutorial Workshops

The Spoken Tutorial Project Team conducts workshops and gives certificates.

For more details, please write to us.

Slide Number 8

Forum Slide

Do you have questions in this Spoken Tutorial?

Please visit this site

Choose the minute and second where you have the question.

Explain your question briefly.

Someone from the FOSSEE team will answer them.

Please post your times queries in this forum.
Slide Number 9

DWSIM Flowsheeting Project

The FOSSEE team coordinates conversion of existing flowsheets into DWSIM.

We give honorarium and certificates for those who do this.

For more details, please visit this site.

Slide Number 10

Lab Migration Project

The FOSSEE team helps migrate commercial simulator labs to DWSIM.

We give honorarium and certificates for those who do this.

For more details, please visit this site

Slide Number 11


Spoken Tutorial and FOSSEE projects are funded by NMEICT, MHRD, Government of India.
Slide Number 12


We thank the DWSIM team for making it as an open source software.

This tutorial was originally recorded by Prof Kannan Moudgalya in May 2015.

This is Kaushik Datta from IIT Bombay.

Thanks for joining.

Contributors and Content Editors

Kaushik Datta