Water (Prandtl number = 6) flows over a flat plate which

Home » Heat-Transfer » Heat Transfer Miscellaneous » Question

Water (Prandtl number = 6) flows over a flat plate which is heated over the entire length. Which one of the following relationship between the hydrodynamic boundary layer thickness (δ) and thermal boundary layer thickness (δ_t) is true

1. δ_t = δ
2. δ_t < δ
3. δ_t > δ
4. Can not be predicted

Correct Option: B

	δ	= ( Pr )ⁿ
	δ_t

Here, Pr = 6 > 1

or	δ	> 1
	δ_t

∴ δ > δ_t