IPHREEQC (Specific Heat Capacity & Viscosity)

[djb14128]

Hi,

I am using IPHREEQC (Excel) at the moment. I'm just wondering if IPHREEQC could calculate and print out the specific heat capacities and viscosities for various compounds/ions. Many thanks.

Kind regards,
Ian Limjap

[dlparkhurst]

Sorry, PHREEQC does not calculate the heat capacity nor viscosity of solutions.

[djb14128]

Hi,

I think PHREEQC can calculate the viscosity of the solution by writing PRINT VISCOS in the input file. I'm just not sure how to make PHREEQC calculate the specific heat capacity. Many thanks.

https://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqc/phreeqc3-html/phreeqc3-54.htm

Kind regards,
Ian
 

[dlparkhurst]

The release notes have the following:

   VISCOS         # At present, returns the viscosity of a pure water solution, same as
                  # VISCOS_0, milliPascal second.
   VISCOS_0       # Returns the viscosity of a pure water solution at current conditions
                  # milliPascal second.

So, VISCOS is only the viscosity of pure water. Tony Appelo had worked on this a while ago, but, I think was never finished.

As for heat capacity, the only thermodynamic information PHREEQC has for an aqueous species is the enthalpy at 25 C, and/or an analytical expression for the log K (and sometimes neither), and the only value currently retrievable with a Basic function is the log K at the current temperature (LK_SPECIES("HCO3-"), for example).

[djb14128]

Thank you for replying back.

Are there any physical relationships/chemical formulas out there that would enable me to calculate the specific heat capacity and the viscosity of the solution? For the specific heat capacity, I was thinking of using the Kopp's law for solids and liquids, but I'm not sure about the viscosity.

Kind regards,
Ian