Consider incompressible laminar flow of a constant property Newtonian fluid in an isothermal circular tube. The flow is steady with fully-developed temperature and velocity profiles. The Nusselt number for this flow depends on
- neither the Reynolds number nor the Prandtl number
- both the Reynolds and Prandtl numbers
- the Reynolds number but not the Prandtl number
- the Prandtl number but not the Reynolds number