My book says that for uniform rotational flow, the velocity at any point is proportional to r (v = wr.) In vortex flow, the velocity at any point is proportional to 1/r (angular momentum is conserved.) However, in uniform rotational flow, isn't angular momentum also conserved so the same logic applies here? If not, what is changing the angular momentum? I know that physically, uniform rotational flow follows v = wr, but I am confused about angular momentum here.