Passive Scalar Interaction Coefficient
 

Dear All

I need your help on Passive scalar interactions Coefficient and the implementation of Passive scalar interaction.

1. 2. ��=��(��1��1−��2��2)����

• J is the mass flow rate.
• k is the interaction coefficient set under the Phase Interaction node.
• ρ1 is the density of the Lagrangian particle.
• ρ2 is the density of the Eulerian fluid.
• ϕ1 is the value of the passive scalar for the Lagrangian particle.
• ϕ2is the value of the passive scalar for the Eulerian fluid.
• Ap is the surface area of the particle.

II am not sure how to calculate or determined k in the above equation.