# thermophysicalProperties

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 December 7, 2010, 08:50 thermophysicalProperties #1 Senior Member     Tobias Holzmann Join Date: Oct 2010 Location: Leoben (Austria) Posts: 1,125 Blog Entries: 6 Rep Power: 20 Hi all, i 'm working with chtMultiRegionSimpleFoam and want to implement new thermophysicalProperties. Thats the code i used until now Code: ```thermoType hRhoThermo>>>>; mixture water 1 18 1000 4181 0 959e-6 6.62;``` and now i want to use that one to make cp / rho temperature dependend Code: ```// thermoType hRhoThermo>; // mixture // water 1 18 // rhoPolynomial (1000 0 0) // 0 // 0 // CpPolynomial (4181 0 0) // muPolynomial (959e-6 0 0) // kappaPolynomial (145e-6 0 0)``` But i can' t find anything about how to use it. And which entry i have to change. Read in the UserGuide about icoPoly4ThermoPhysics - but there is nothing. Using OF-1.7.x and the code is in the multiRegionLiquid case. and what 's kappa ? I compare all values with my table of water and think that mu is the dynamic viscosity - rho and cp is clear but what 's kappa did someone know how to use this ? Best reguards Tobi

 December 9, 2010, 09:31 #2 Senior Member     Tobias Holzmann Join Date: Oct 2010 Location: Leoben (Austria) Posts: 1,125 Blog Entries: 6 Rep Power: 20 No idea or answers?

 December 9, 2010, 11:21 #3 Senior Member   Christian Lucas Join Date: Aug 2009 Location: Braunschweig, Germany Posts: 198 Rep Power: 8 Hi this is a guess; to be sure have a look at the code. kappa is called isothermal compressibility coefficient and is defined as -1/v * (dv/dp)@T=constant, where v is the spec. volume. Have a look at a thermodynamics book e.g. “Thermodynamik kompakt” page 53 (sorry for the german reference ) Kappa is needed to calculate psi Regards, Christian

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