Grain growth (GG) vs coarsening

Difference: grains end up 2-sided (Fradkov, Udler), bubbles disappear with 3,4 or 5 sides.

Open question: difference between scaling states, distributions

Is curvature sometimes non-uniform in GG?

Review paper Weaire & McMurry, Solid State physics.

underlying physics: in GG surface energy is dependent on the direction of the crystal axes; no analogue in foams

Time-scales of energy minimization  and bubble volume  evolution are very different in foams and polycrystals

If time-scales are well-separated, the evolver is exact

After a T1, the system has to choose between different  possible new equilibrium configurations.

In 2D, the viscous froth model is a possible answer to this problem.

viscosity can be physical (mechanical?)  or physico-chemical; or numerical viscosity (not robust - depends on meshing).

What is mu_2(n) in the scaling state? 1.3 (Cox), 1.4 (Herdlte), 1.2 (Weaire) ... can the community pin this down? Compare values? What about for GG?