posted by Peter on .
Newton law of cooling and cooling collision.
I don't know what you mean by "cooling collision".
His "law of cooling" of a surface is an approximation,
q = A*h*(T - Tw), where
A is the area
T is the fluid temperature in the "free stream"
h is the "film coefficient" which depends upon velocity, geometry and temperatures
Tw is the wall temperature
Values of h are usually calculated from dimensional analysis of experimental data.