What similarity number reflects the influence of the fluid physical properties on the heat transfer? Fo Nu Re Gr Pr

The similarity number that reflects the influence of the fluid physical properties on the heat transfer is the Prandtl number (Pr). The Prandtl number is a dimensionless number used in fluid mechanics and heat transfer to characterize the ratio of momentum diffusivity to thermal diffusivity. It represents the relative importance of momentum and heat transfer in a fluid. A higher Prandtl number indicates that momentum diffusivity is more significant than thermal diffusivity, while a lower Prandtl number suggests the opposite.