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ThermophysicalProperties

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Old   April 3, 2012, 09:12
Default ThermophysicalProperties
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Martin
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Hey guys,

I am having troubles to figure out what the Hf-Value in the thermodynamics is. In the doc of OF:

Code:
air 
{ 
    specie 
    { 
        nMoles          1; 
        molWeight       28.96; 
    } 
    thermodynamics 
    { 
        Cp              1004.5; 
        Hf              2.544e+06; 
    } 
    transport 
    { 
        mu              1.8e-05; 
        Pr              0.7; 
    } 
}
so Air has 2.544e+6. The doc says it is the heat of fusion. -> I AM CONFUSED
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Old   September 8, 2012, 11:09
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Tim Hickmott
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Bump!

I'm also quite confused about this, all the tutorial examples I can find that are supposedly air have Hf set to 0.

any clues anyone?
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Old   September 9, 2012, 08:56
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Tim Hickmott
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Ok think I cracked it for anyone who comes along, Hf is a reference heat of fusion - I was looking in the source code hConstThermoI.h and it's only used to define enthalpy

h = cp*T + Hf

hence only applies with multiple phases or fluid types since h = cp*T generally
therefore if using a single fluid type it doesn't matter what you set it to

please correct me if I'm wrong :-)
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