Diffusivity coefficients in multicomponent systems

In summary, diffusivity coefficients in multicomponent systems are important in understanding the diffusion rate of substances and predicting mixing and separation processes. They can be calculated using mathematical models and experimental techniques. Factors such as temperature, pressure, molecular size, and interactions can affect diffusivity coefficients, and they have practical applications in industries such as chemical engineering and materials science. These coefficients can also change over time due to various factors, such as changes in temperature or chemical reactions.
  • #1
maistral
240
17
Hi. Is anyone aware of a method to estimate diffusivities in multicomponent systems?

Ie. Finding the gas diffusivity coefficient of ethane in an air-methane mixture, or the liquid diffusivity coefficient of acetone in a water-ethanol mixture.
 
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  • #2
Are you familiar with HCB?
 
  • #3
Bystander said:
Are you familiar with HCB?

Hi, thanks for replying.

I don't even know what the acronym means, sorry.
 
  • #4
Hirschfelder, Curtiss, & Byrd, Molecular Theory of Gases and Liquids, John Wiley & Sons, Inc., New York, 1954.
 
  • #5
Also, there is a summary of the results from Hirschfelder, Curtiss, and Bird in the book Transport Phenomena by Bird et al.
 

Related to Diffusivity coefficients in multicomponent systems

1. What is the significance of diffusivity coefficients in multicomponent systems?

Diffusivity coefficients in multicomponent systems play a crucial role in understanding the rate of diffusion of one substance into another. They provide a measure of the ease with which molecules move through a medium, and are essential in predicting and controlling the mixing and separation of different components in a system.

2. How are diffusivity coefficients calculated in multicomponent systems?

Different mathematical models and experimental techniques can be used to determine diffusivity coefficients in multicomponent systems. These include Fick's law, which relates diffusivity to concentration gradients, as well as more complex diffusion models that take into account factors such as temperature, pressure, and molecular interactions.

3. What factors can affect diffusivity coefficients in multicomponent systems?

Diffusivity coefficients can be influenced by a variety of factors, such as temperature, pressure, molecular size, and interactions between different components. In addition, the presence of boundaries or obstacles in the medium can also impact the diffusion rate of different substances.

4. How can diffusivity coefficients in multicomponent systems be used in practical applications?

Diffusivity coefficients have a wide range of applications in various industries, including chemical engineering, materials science, and biotechnology. They can be used to optimize processes such as mixing, separation, and mass transfer, as well as in the design and development of new materials and products.

5. Can diffusivity coefficients in multicomponent systems change over time?

Yes, diffusivity coefficients can change over time due to various factors such as changes in temperature, pressure, or composition of the system. In addition, the presence of chemical reactions or phase transformations can also alter the diffusivity of different components in a system.

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