Question

For the fluid flowing over a flat plate with Prandtl number greater than unity, the thermal boundary layer for laminar forced convection.

• A.
  is thinner than the hydrodynamic boundary layer
• B.
  has thickness equal to zero
• C.
  is of same thickness as hydrodynamic boundary layer
• D.
  is thicker than the hydrodynamic boundary layer

Answer 1

The correct option is A

is thinner than the hydrodynamic boundary layer
$P{r}^{1/3}=\frac{\delta }{{\delta }_t},ifPr>1$,

it means $\delta >{\delta }_t$