I've always found anger to be destructive first and constructive second. Ergo I usually disappear if I'm angry. Once I've had time to kill you sixteen ways from sunday in my head a more bright and breezy mood settles and then I can return with my wits in tact and kick your ass
This whole internalise = bad thing that get's bandied about either I fail to understand it or as far as I can see it's an extroverts witch hunt. In my understanding of internalise that's exactly what I do with my anger. I stop emitting anything until the anger is processed (unless of course I'm trying to achieve something and get annoyed, in which case I often end up channelling that anger into progressing further which also often results in injuries and needing replacement things [most often I break stuff, stuff that shatters with a satisfying noise and level of mess]). I do turn inward and deal with it without recourse to emitting my foul temper (with exceptions as noted and others). I fail to see how sheparding an introvert into some "primal scream therapy"-esque treatment is a good idea. Sure they may well scream but you may also find that you'll stress them out whilst doing it and end up with an introvert up in your face which is never advisable.
Personally I deal with anger strictly but that's mainly because I hate being angry. People swarm you when you're annoyed and try to check if everything is okay every frickin 5 seconds (can you tell I live with an ESTP? ). You get "concerned" Fs trying to soothe your temper when all you want is for everyone to stop looking and pointing before the instinct to poke their eyes out with their own pointing fingers grows too much to bear.
That's why my first response to anger is removal of the source of annoyance often by avoiding it.
Then I tend to fume for a while before a new and more interesting idea comes along at which point I can't really be bothered to maintain my flame.
The only time I really can tell the difference between sheer unreasoned anger and the more tempered heat of righteous focused wrath is simply by the presence of reasoning.
If I can reason and plan and analyse and figure out my next few steps (usually only a few cause I know full well that I won't be annoyed for long and so only make short term plans for it). If I am in the mood to achieve something constructive with my fuming then it's probably a reasonable mood (in context to the situation) where as if all I wish to do is injure people or rid myself of them somehow then (presuming it's someone I wouldn't normally wish to rid myself of) I'm probably feeling unreasonable and hence shouldn't really "bite" on this temptation.
Of course another thing which I've found helped is music which resonates with my darker side. If I can enjoy the fires held there without having to be annoyed or irritated first then I become familiar with it and am more able to cope with it. That's not to say that people who listen to death metal all day are well adjusted, everything in moderation.