The hydrodynamic and thermal boundary layer are identical at Prandtl number equal to

The temperature gradient in the fluid flowing over a heated plate will be

For a fluid having Prandtl number equal to unity the hydrodynamic boundary layer thickness $\delta$ and thermal boundary layer thickness ${\delta }_t$ are related as 

Heat is lost from a 100 mm diameter steam pipe placed horizontally in ambient air at 30$°$C. If the Nusselt number is 25 and the thermal conductivity of air is 0.03 $w/m^{2}K$ , then the heat transfer coefficient will be .............. $w/m^{2}K$  

Which of the following properties of air does increase with rising in temperatures?

When all the conditions are identical, in the case of flow-through pipes with heat transfer, the velocity profiles will be identical for

When there is a flow of fluid over a plate of length 'L', The average heat transfer coefficient is given by ( $N{u}_x$ = local Nusselt number, other symbols have the usual meaning)

The overall heat transfer coefficient is used in problems of 

The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as

The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as