Answer:
(b)False
Explanation:
Given:
Prandtl number(Pr) =1000.
We know that [tex]Pr=\dfrac{\nu }{\alpha }[/tex]
Where [tex]\nu[/tex] is the molecular diffusivity of momentum
[tex]\alpha[/tex] is the molecular diffusivity of heat.
Prandtl number(Pr) can also be defined as
[tex]Pr=\left (\dfrac{\delta }{\delta _t}\right )^3[/tex]
Where [tex]\delta[/tex] is the hydrodynamic boundary layer thickness and [tex]\delta_t[/tex] is the thermal boundary layer thickness.
So if Pr>1 then hydrodynamic boundary layer thickness will be greater than thermal boundary layer thickness.
In given question Pr>1 so hydrodynamic boundary layer thickness will be greater than thermal boundary layer thickness.
So hydrodynamic layer will be thicker than the thermal boundary layer.
