I have been playing around with an app to demonstrate high speed objects entering earth's atmosphere. I am using the drag equation to approximate how much kinetic energy gets converted into heat at each millisecond, which seems to be working OK. However, I also need to figure out approximately what percentage of this heat is dissipated into the atmosphere and how much gets re-absorbed into the object.
I am using a lot of simplifying assumptions in this simulation, like that the earth is a sphere, and (worse) that the atmosphere's temperature doesn't change with altitude, so I am looking for a constant or fairly simple equation to approximate this. I there a reasonable way to do this?
TL;DR: How much aerodynamic heating is left in the atmosphere, vs how much is retained/reabsorbed by the high-speed object?