Calculating Sutherland law's input

erkampasha · September 6, 2022, 20:50

I need sutherland function for ethylene. For two coefficient method C1 and C2 are required, for three coefficient method S, ref Temp and ref viscosity.

How can i obtain these input?

LuckyTran · September 7, 2022, 01:14

1) In general you use a database of viscosity and curve fit it using regression software. Note that transport properties are a function of temperature and pressure, so you should do this fit at the desired operating pressure but most people don't have such a database and often use atmospheric properties and blindly apply them to pressures like 100 bar.

2) You steal it from someone else's work and inconveniently forget to cite the source.

September 6, 2022, 20:50	Calculating Sutherland law's input	#1
erkampasha Member İbrahim Join Date: Jun 2017 Posts: 31 Rep Power: 9	I need sutherland function for ethylene. For two coefficient method C1 and C2 are required, for three coefficient method S, ref Temp and ref viscosity. How can i obtain these input?

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September 7, 2022, 01:14		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,737 Rep Power: 66	1) In general you use a database of viscosity and curve fit it using regression software. Note that transport properties are a function of temperature and pressure, so you should do this fit at the desired operating pressure but most people don't have such a database and often use atmospheric properties and blindly apply them to pressures like 100 bar. 2) You steal it from someone else's work and inconveniently forget to cite the source.