Chemical Engineering - Heat Transfer - Discussion

Reynolds' analogy is a concept used in fluid dynamics to relate the heat transfer characteristics (Nusselt number, Nu) and the frictional properties (Reynolds number, Re) of a flowing fluid.

Answer A: Nst α f.

This means that the Nusselt number (Nu) is proportional to the friction factor (f). In other words, the heat transfer rate in a fluid flow situation is directly related to the frictional properties of the flow. When Nu increases, it implies that heat transfer is more efficient, which is often associated with higher levels of turbulence and increased friction (higher f values) in the flow.

The Reynolds Analogy is popularly known to relate turbulent momentum and heat transfer. . The main assumption is that heat flux q/A in a turbulent system is analogous to momentum flux Ï„, which suggests that the ratio Ï„/ (q/A) must be constant for all radial positions.

Reynolds number Analogy is equal in properties.

Reynolds analogy means?

But Reynold number also propasanal to friction factor.

We know that Nst(Npr)1÷3 = f÷2 when Npr = 1 then we found states mathematically Nst = f÷2 this statement is called Reynold's Analogy.

Stanton Number is directly proportional to Fanning friction factor.

Nst = (f/2).