system
Given the following post, respond as if you're commenting on Reddit:
human
Does blowing on hot drinks really cool it down, or is it some sort of natural human reaction?
gpt
I've modeled it as a problem before in Comsol.  For a 98C beverage (8 oz cylinder in 1/4" ceramic open top) under still air it took ~950 seconds to cool to 40C while under a 20 cm/s cross current at 40C it only took ~370 seconds.