Method of calculating Sutherlands equation for Cesium vapor?

massive_turbulence · December 29, 2018, 16:29

Hello,

What I want to ask is just a general idea of how to go about calculating Sutherlands equation given that I don't have Sutherland coefficient As and Sutherland temperature Ts for Cesium vapor.

I looked at this page for the transport model

https://cfd.direct/openfoam/user-gui...hermophysical/

and this page also

https://www.lmnoeng.com/Flow/GasViscosity.php

and this

https://www.cfd-online.com/Wiki/Sutherland%27s_law

Basically I needed this for OpenFOAM buoyantPimpleFoam. I already have the Janaf table for Cs.

Thanks!

massive_turbulence · December 31, 2018, 20:18

I extrapolated the values from ammonia and several other known gases and it turns out cesium vapor is almost on the same curve as ammonia. I attached the chart.

For ammonia the Sutherland Temp = 293.15K and Constant = 370K and reference viscosity is 9.82 uPa*s.

viscosity_cropped.gif

December 29, 2018, 16:29	Method of calculating Sutherlands equation for Cesium vapor?	#1
massive_turbulence Senior Member Andrew Somorjai Join Date: May 2013 Posts: 175 Rep Power: 13	Hello, What I want to ask is just a general idea of how to go about calculating Sutherlands equation given that I don't have Sutherland coefficient As and Sutherland temperature Ts for Cesium vapor. I looked at this page for the transport model https://cfd.direct/openfoam/user-gui...hermophysical/ and this page also https://www.lmnoeng.com/Flow/GasViscosity.php and this https://www.cfd-online.com/Wiki/Sutherland%27s_law Basically I needed this for OpenFOAM buoyantPimpleFoam. I already have the Janaf table for Cs. Thanks!

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December 31, 2018, 20:18		#2
massive_turbulence Senior Member Andrew Somorjai Join Date: May 2013 Posts: 175 Rep Power: 13	I extrapolated the values from ammonia and several other known gases and it turns out cesium vapor is almost on the same curve as ammonia. I attached the chart. For ammonia the Sutherland Temp = 293.15K and Constant = 370K and reference viscosity is 9.82 uPa*s. viscosity_cropped.gif