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Latest revision as of 10:05, 8 January 2020
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Welcome to the spoken tutorial on creating a material stream in DWSIM
My name is Kannan Moudgalya |
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In this tutorial, we are going to learn
How to select chemical components How to choose a thermodynamic package How to choose units and values and How to specify a material stream |
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To record this tutorial, I am using DWSIM 3.4 windows version
But this process is identical in Linux, Mac OS X and FOSSEE on ARM |
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To practice this tutorial
You should have access to DWSIM |
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Let us start with creating a new steady state simulation
When DWSIM is opened, you see a startup window, such as this |
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Click on Create new simulation
If a simulation wizard appears, cancel it On the top left, locate a field called Simulation |
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Hover the mouse over the puzzle like button next to it |
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You can see that it is known as Configure Simulation
Press this button |
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A Configure Simulation pop-up opens
In some earlier versions, this pop-up opened automatically |
| The lettering is very small and unreadable in this recording
To address this, I will zoom in on the relevant portion of this screen only I have now rearranged the screen for better readability | |
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In the component search tab of this window, type benzene
Benzene appears in two rows We are interested in the entry that has DWSIM as the database We will explain in another tutorial the significance of other databases |
| Double click anywhere on this line | |
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You could have pressed the Add button also
which is on the right hand side which we will see shortly You can see that Benzene is now selected I shall let you see it by shifting the pop up window to the left |
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Repeat this for toluene
Let us select this Let us add You can see that the component selection is completed |
| I shall shift the window back to where it was | |
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We are now ready to choose Thermodynamics |
| Let us go back to the slides
Let us go to the next slide | |
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This slide has guidelines on how to choose thermodynamics
Covering the theory behind this slide is beyond the scope of this tutorial As Benzene and Toluene form an ideal solution, we can choose Raoult's law |
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Let us do this in DWSIM
Locate the thermodynamics tab on the left hand side Click on it A sub-menu appears in the white space above. |
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Click on Property Packages in the sub-menu |
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Scroll down in this list and locate an option called Raoult's lawChoose this by double clicking on it. |
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You will see Raoult's law appearing on the right hand side of the pop-up
To see this, let me shift the pop-up to the left. |
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On the lower right hand corner of this pop-up, locate a button called Back to Simulation.
Click on it. |
| The configure simulation pop-up gets closed and we are ready to do the simulation | |
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The canvas at the centre is used to create flowsheets
We will now create a material stream |
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On the right hand side, you see an object palette
It has a large collection of many useful chemical engineering objects You can scroll it and see what all are available |
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Right at the top of this is the material stream object
Click it and drag it to the flowsheet |
| At the desired place, remove your finger from the mouse to drop the stream
You may leave it anywhere on this canvas You can also move the stream to another place later, if required | |
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Immediately after dropping the stream, a pop-up to enter compositions appearsNotice that mole fraction is selected by default
You can choose one of the other possibilities But, I shall leave it as it is |
| The chemicals that we already selected appear here automatically | |
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Type 0.5 in the equilibrium composition of toluene
Press down arrow |
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Type 0.5 in the equilibrium composition of benzene
Click Apply |
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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 But this may give some unpredictable values at times So, you yourself may want to ensure that the total comes to 1 |
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Click the Close button |
| You can always get back to the previous pop-up by double clicking on the stream | |
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Below the configure simulation button, notice a place to change the System of Units
Let us click this menu and choose CGS System |
| Let us now complete the specification of this stream | |
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Click on the stream icon in the flowsheet once – do not double click it |
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On the left hand side of the flowsheet you will see the selected object window
This window consists of Properties and Appearance tabs |
| The properties tab shows all the properties of the streamDWSIM assigns default values to all properties | |
| Let us first scroll up this page
There are many ways to complete the specification of a material stream | |
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Press on Specification |
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A down arrow appears on the right hand side – press it |
| The default is to specify pressure and temperature.
I shall leave it as it is. | |
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I shall press the down arrow once again to close the menu |
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We see the number 25 already entered against the temperature
I will by hovering the mouse over Temperature, we see the units as degree Celsius |
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Let us click to the right of this number
It is an editable field Let me delete it and enter 30 |
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Let us look at pressure next.
I shall leave it at 1 atmosphere. |
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Let us specify the flowrate next.
we can specify mass flowrate or molar flowrate or volumetric flowrate. |
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We will specify molar flowrateI shall delete the old value and enter 100 |
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Press enter to save this change. |
| Units for this field are moles per second as we can see now
. It is possible to use a combination of units, such as CGS and SI. | |
| We will postpone this discussion to another tutorial
Now the stream is fully defined. | |
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DWSIM has given the name MSTR-004 to this stream automatically |
| You may see some other name in your simulation, but do not worry about it
As I am not happy with this automatically generated name, let me change it | |
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Under the selected object window, click on the appearance tab
The Appearance tab is used to modify the visual appearance of the stream |
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Click on the blank space beside Name and type Inlet1 after deleting this.
Click on the Name again. |
| You can see the name Inlet1 appearing below this stream in the flowsheet.
We will build on this material stream in the upcoming tutorials. | |
| Let us go back to the slides.
We go to the next slide. | |
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Let me summarise what we learnt in this tutorial.
We defined a material stream. Chose chemical components. Chose the property estimation package. Completed specifications. Assigned values and units. Specified temperature, pressure and flow rate. Pointed out many different options. |
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I would like to give some assignments now.
Choose Benzene and Toluene mole fractions that do not add up to 1. Check how DWSIM normalises when you press apply. |
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Go to the page where you defined mole fractions.
Check what the normalise button does when the total is not 1. |
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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. |
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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 |
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This video summarises the Spoken Tutorial project.
If you do not have good bandwidth, you may download and watch it. |
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We conduct workshops using Spoken Tutorials.
Give Certificates. Please contact us. |
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The Spoken Tutorial project is funded by NMEICT, MHRD, Govt. of India |
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We thank the DWSIM team for making it as an open source software
I want to thank you the listener for joining me in this tutorial, goodbye. |
