- #1
bumblebee77
- 56
- 2
Hi...I would very much appreciate thermo help. I am using software that requires enthalpy data to be in units of J/m^3 (i.e., enthalpy per unit volume). The software also requires that enthalpy always increases with increasing temperature.
My problem is that my enthalpy data in J/m3 do not always increase with increasing temperature. The data are output from calculations of multiphase, multicomponent cooling/crystallization. Specifically, the system (liquid + solids produced) AND the liquid AND the solids enthalpies vary as T decreases.
I am embarrassed to ask, but should 1) system and 2) liquid or solids enthalpies in units of J/unit volume stay constant, or only decrease, or decrease and increase during multiphase, multicomponent cooling/crystallization? What about in a one-component system? Would this be different?
My system, solids, and liquid enthalpy data do increase AND decrease as T decreases (i.e., during crystallization). I need to know whether they should. Then I can figure out how to deal with getting my enthalpy data into the software that requires enthalpy only decrease with decreasing T.
Thank you very, very much for any help!
My problem is that my enthalpy data in J/m3 do not always increase with increasing temperature. The data are output from calculations of multiphase, multicomponent cooling/crystallization. Specifically, the system (liquid + solids produced) AND the liquid AND the solids enthalpies vary as T decreases.
I am embarrassed to ask, but should 1) system and 2) liquid or solids enthalpies in units of J/unit volume stay constant, or only decrease, or decrease and increase during multiphase, multicomponent cooling/crystallization? What about in a one-component system? Would this be different?
My system, solids, and liquid enthalpy data do increase AND decrease as T decreases (i.e., during crystallization). I need to know whether they should. Then I can figure out how to deal with getting my enthalpy data into the software that requires enthalpy only decrease with decreasing T.
Thank you very, very much for any help!