How to Determine the Viscosity of a Chemical System?

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Discussion Overview

The discussion revolves around determining the viscosity of a chemical system involving a reaction between components A, B, C, and D. Participants explore theoretical and practical approaches to relate individual component viscosities to the overall viscosity of the mixture, as well as software tools for simulation.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant inquires about equations or software to determine the viscosity of a chemical system given the concentrations of reactants and products.
  • Another suggests looking into IBM research for software related to physical parameters and mentions the need for specific details to further the discussion.
  • A participant expresses the need to find a relationship between the viscosities of individual components and the overall viscosity of the mixture, acknowledging that viscosity is not additive.
  • There is a mention of potential similarities to molar volume data for non-ideal solutions, specifically referencing ethanol and water interactions.
  • One participant notes that determining viscosity may require temperature and pressure considerations, as well as phase distinctions, and suggests using tables like the JANAF tables for reference.

Areas of Agreement / Disagreement

Participants do not reach a consensus on a specific method or formula for determining the viscosity of the mixture, and multiple competing views and approaches remain in the discussion.

Contextual Notes

Participants acknowledge limitations in their current knowledge and the need for specific conditions such as temperature, pressure, and phase when determining viscosity. There is also an indication that the relationship between individual and overall viscosity is complex and not straightforward.

Who May Find This Useful

This discussion may be useful for researchers or students in chemistry or chemical engineering interested in the properties of mixtures and the determination of viscosity in chemical systems.

karthik3k
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Say the reaction is like:

A + B <=> C + D

and i know the individual concentrations of the reactants and products.

Is there any equation to find the viscosity of the system?

Any softwares to simulate??
 
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you may want to looking through the ibm research site as they have nice softwares related to such physical parameters. If you know of a way to relate the density of such a system with viscosity and surface tension, such matters can be elucidated simply by browsing through a physical chemistry text. You'll need to be more specific if you wish to further discuss the matter.
 
more specific?
ok. as much as the details i know...

I have a reaction as mentioned before. Say if i have the reaction kinetics also.
I would be knowing the concentration or mass fraction of each component(A,B,C and D) at a given time.

I have the viscosity data for different mass fractions of the components(from CRC book).

But i need to know the viscosity of the whole system?

I know that viscosity is not additive. But is there any relation/function relating individual viscosities of the system to the viscosity of the whole system?

To be very short and brief,
I have X and Y of known viscosity each. What will be the viscosity of its mixture if i mix the known quantities of X and Y ?
 
I'll have to do some research myself, at this point nothing specific springs to mind, but I would imagine that this is somewhat similar to the molar volume graphical data against the extent of reaction such as that for ethanol and water in which the two will interact for a non-ideal solution density. But for now the following links may be of help

http://rsc.anu.edu.au/~evans/evansmorrissbook.htm

http://en.wikipedia.org/wiki/Viscous
 
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Likely determining the viscosity would require a table lookup for each component (element or molecular species) which would involve temperature and pressure. Phase would be important - gases have lower viscosity than liquids, and another consideration would be whether one component is dispersed in the other, e.g. fine microdroplets of gasoline in air/oxygen.

Such data have been available in the JANAF tables, which I believe have been put in electronic format.

http://www.nist.gov/srd/thermo.htm
 
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