The above image represents the diffusion coefficient at constant temperature. To calculate diffusion coefficient at constant temperature, four essential parameters are needed and these parameters are Activation Energy of Diffusion (Qd), Gas Constant (R), Temperature (T) and Constant that Varies with Metal Properties (Do).
The formula for calculating diffusion coefficient at constant temperature:
D = Doexp(-Qd/RT)
Where:
D = Diffusion Coefficient at Constant Temperature
Qd = Activation Energy of Diffusion
R = Gas Constant
T = Temperature
Do = Constant that Varies with Metal Properties
Let’s solve an example;
Find the diffusion coefficient at constant temperature when the activation energy of diffusion is 10, the gas constant is 8, the temperature is 12 and the constant that varies with metal properties is 4.
This implies that;
Qd = Activation Energy of Diffusion = 10
R = Gas Constant = 8
T = Temperature = 12
Do = Constant that Varies with Metal Properties = 4
Then, D = Doexp(-Qd/RT)
D = 4exp(-(10)/(8)(12))
That is, D = 4exp(-(10)/(96))
D = 4exp(-(0.10416666666666667))
D = 4exp(-0.10416666666666667)
So, D = 4(0.9010751057212906)
D = 3.60
Therefore, the diffusion coefficient at constant temperature is 3.60m²/s.
Read more:Â How to Calculate and Solve for Diffusion Coefficients | Diffusion in Alloying
How to Calculate Diffusion Coefficient at Constant Temperature Using Nickzom Calculator
Nickzom Calculator – The Calculator Encyclopedia is capable of calculating the diffusion coefficient at constant temperature.
To get the answer and workings of the diffusion coefficient at constant temperature using the Nickzom Calculator – The Calculator Encyclopedia. First, you need to obtain the app.
You can get this app via any of these means:
Web – https://www.nickzom.org/calculator-plus
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You can also try the demo version via https://www.nickzom.org/calculator
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Apple (Paid) – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8
Once, you have obtained the calculator encyclopedia app, proceed to the Calculator Map, then click on Materials and Metallurgical under Engineering.
Now, Click on Diffusion In Alloying under Materials and Metallurgical
Now, Click on Diffusion Coefficient at Constant Temperature under Diffusion In Alloying
The screenshot below displays the page or activity to enter your values, to get the answer for the Diffusion Coefficient at Constant Temperature according to the respective parameter which is the Activation Energy of Diffusion (Qd), Gas Constant (R), Temperature (T) and Constant that Varies with Metal Properties (Do).
Now, enter the values appropriately and accordingly for the parameters as required by the Activation Energy of Diffusion (Qd) is 10, Gas Constant (R) is 8, Temperature (T) is 12 and Constant that Varies with Metal Properties (Do) is 4.
Finally, Click on Calculate
As you can see from the screenshot above, Nickzom Calculator– The Calculator Encyclopedia solves for the diffusion coefficient at constant temperature and presents the formula, workings and steps too.
