Reply To: Energy conservation/balance in mixture multiphase

[Amir]

The majority of difference happens in the first 100s. For 600s phase-2 energy change is 1.8e+06J with 117g liquid generated, and for the first 100s it is 1.5e+06J with 101g liquid generated. 

Solution converged at 14780th iteration (739th time step---0.739s physical time). The earliest .out file that is saved is for 1s physical time and the results are as below:

After 1s:

whole system energy change: 0.008e+06 J

whole system enthalpy change: 0.009e+06J 

mixture energy change: 0.0044e+06J

mixture enthalpy change: 0.0049e+06J

 phase-1(liquid water) energy change: 0.019e+06J

phase-1(liquid water) enthalpy change: 0.019e+06J

phase-2(humid air) energy change: 0.033e+06J

phase-2(humid air) enthalpy change: 0.034e+06J

solid energy change: 0.003e+06J

solid enthalpy change: 0.003e+06J

liquid water generated: 1.8 gram which means 0.0043e+06 J energy released from phase change.

 

After 2s:

whole system energy change: 0.0077e+06J 

whole system enthalpy change: 0.0083e+06J 

mixture energy change: 0.00049e+06J      

mixture enthalpy change: 0.0011e+06J    

phase-1(liquid water) energy change: 0.027e+06J  

phase-1(liquid water) enthalpy change: 0.027e+06J 

phase-2(humid air) energy change: 0.065e+06J   

phase-2(humid air) enthalpy change: 0.066e+06J  

solid energy change: 0.007e+06J 

solid enthalpy change: 0.007e+06J

liquid water generated 4.7 gram would released: 0.011e+06 J.

 

After 100s:

whole system energy change: 0.26e+06J 

whole system enthalpy change: 0.18e+06J 

mixture energy change: -0.08e+06J      

mixture enthalpy change: -0.11e+06J    

phase-1(liquid water) energy change: 0.02e+06J  

phase-1(liquid water) enthalpy change: 0.02e+06J 

phase-2(humid air) energy change: 1.5e+06J   

phase-2(humid air) enthalpy change: 1.5e+06J  

solid energy change: 0.29e+06J 

solid enthalpy change: 0.29e+06J

Liquid water generated:101g which would have released 0.227e+06 J.

 

After 200s:

whole system energy change: 0.71e+06J 

whole system enthalpy change: 0.27e+06J 

mixture energy change: -0.06e+06J      

mixture enthalpy change: -0.105e+06J    

phase-1(liquid water) energy change: -0.036e+06J  

phase-1(liquid water) enthalpy change: -0.036e+06J 

phase-2(humid air) energy change: 1.76e+06J   

phase-2(humid air) enthalpy change: 1.73e+06J  

solid energy change: 0.37e+06J 

solid enthalpy change: 0.37e+06J

Liquid water generated:116g which would have released 0.283e+06 J.

 

Looking at results abow, it seems the main change in phase-2 energy and enthalpy happen during the first 100s. it also changes after that, but 83% of change happens in the first 100s. phase-2 energy and enthalpy are those that won't add up with the rest of results.