Two very large gray planes are at the constant temperatures of T1 and T2. If the two gray planes have emissivities of ε1 and ε2, respectively, what is the net heat exchange rate per unit area
Dittus-Boelter equation, NNu=0.023 (NRe) (NPr)n, where n = 0.4 for hot fluid and n = 0.3 for cold fluid, is applicable for
In forced convection the heat transfer depends on
The Fourier number (N) is defined as
The thermal diffusivity of a material is defined as
When heat is transferred by a chain of molecules from the hot area of an object to a colder area, the process of heat transfer is called