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This function is part of the fitting options in VLXE.
The function solves for a bubble kij value at fixed temperature and pressure. This may sounds a bit strange but it works just like a bubble point pressure calculation only that pressure and not kij is now fixed.
It is handy if only the kij is to be fitted. For each data point the function will give a exact kij value that can then be fitted to the temperature dependent kij expression used in VLXE Blend.
The linear fit can be done using the 2 Excel functions: SLOPE and INTERCEPT.
Note: The best way to use this function is to use the wizard. Select: VLXE Blend/Wizard on the menu
Input
Argument
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Type
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Optional
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Description
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Feed
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Range of double
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No
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A range of cells with the feed
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Temperature
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C# : double
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No
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Temperature. Units [User defined]
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Pressure
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C# : double
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No
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Pressure. Units [User defined]
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InitialKij
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C# : double
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No
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Initial guess for the kij. This is used when there are more then one solution.
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IndexI
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C#: int
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No
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Index of the first component for the kij (Note is zero based)
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IndexJ
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C#: int
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No
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Index of the second component for the kij (Note is zero based)
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Output
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C# : string
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No
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Defines the output. See here for more information.
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Components
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C# : string
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No
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Give a list of component names.
Only those components are used in the calculations.
See here for more information
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Units
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C# : string
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No
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Set the units used in this calculation.
See here for more information
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SystemType
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C# : string
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Yes
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Tells the function if the user wants a LLE or VLE system.
Valid input, LLE, VLE, Auto
Default values:
One solvent: VLE
Multi solvents: VLE
Polymer systems: Auto
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Distribution
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C# : object
(Expect a range of double)
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Yes
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Gives a range with the distribution of the polymer. Can for example be used if 2 flash calculations are liked as 2 separation tanks.
See here for more information
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BlockMassfraction
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C# : object
(Expect a range of double)
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Yes
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Sets the block mass fractions in a co-polymer.
See here for more information
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ProjectSheet
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C#: object
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Yes
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Lets the user set the project sheet to use.
See here for more information
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AdvVLXE
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C# : object
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Yes
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Advanced used. Reserved for use by VLXE.
See here for more information
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AdvUser
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C# : object
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Yes
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Advanced used. Reserved for the user. For example it can be used to force the function update.
See here for more information
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Extra
The function is defined in C# as:
public Object[,] BubbleKij(Range Feed, double Temperature, double Pressure, double InitialKij, int IndexI, int IndexJ, string Output, string Components, string Units, [In, Optional] object SystemType, [In, Optional] object Distribution, [In, Optional] object BlockMassfraction, [In, Optional] object ProjectSheet, [In, Optional] object AdvVLXE, [In, Optional] object AdvUser)
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