Commit 318457e1 authored by William D. Fullmer's avatar William D. Fullmer
Browse files

add Gunn HTC

parent 1c4c7d46

docs/source/inputs/InputsCoupling.rst

+35 −0
Changes for docs/source/inputs/InputsCoupling.rst: 35 added lines, 0 removed lines.
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ With the variables defined as follows: 


   .. code:: shell



    /*

     *  \brief Returns: the calculated drag coefficient.

     *

     *  Inputs:
@@ -129,3 +130,37 @@ The Gidaspow model is defined as 
      {

          return 0.0;

      }







Heat Transfer Coefficient

-------------------------





The following inputs must be preceded by "mfix."



+-------------------+---------------------------------+-------------+--------------+

|                   | Description                     |   Type      | Default      |

+===================+=================================+=============+==============+

| convection_type   | Which HTC model to use          | String      | RanzMarshall |

+-------------------+---------------------------------+-------------+--------------+



The options currently supported in mfix are :cpp:`RanzMarshall` (default) and :cpp:`Gunn`. 

In both models the HTC is determined from a Nusslet number corelation. 



The RanzMarshall Nusselt number correlation is defined as: 



   .. code:: shell



      amrex::Real N_Nu = 2.0 + 0.6 * std::sqrt(N_Re) * std::pow(N_Pr, 0.333);





The Gunn Nusselt number correlation is defined as: 



   .. code:: shell



      amrex::Real N_Nu =

          (7 - 10*EPg + 5*EPg*EPg)*(1 + .7*std::pow(N_Re, 0.2)*std::cbrt(N_Pr))

          + (1.33 - 2.4*EPg + 1.2*EPg*EPg)*std::pow(N_Re, 0.7)*std::cbrt(N_Pr);