When this is done, the expression for the heat flux plus the work flux is obtained:
The contribution is the kinetic transport of kinetic, intramole-cular, an intermolecular energy. The contributions , , and represent the work done against external, intramolecular, and inter-molecular forces. The structure of these last three contributions is closely related to the analogous contributions to the momentum flux tensor.
2d. Solution to the Fokker-Planck equation
To get the one-molecule phase-space distribution function needed for describing the behavior of polymer solutions, one can derive and solve an equation of the Fokker-Planck type. This equation is: