Question

The ratio of energy transferred by convection to that by conduction is called

Answer 1

The ratio of convection to conduction is called Biot number or Nusselt number. It is the interaction between conduction in a solid or liquid and convection at its surface. Both are dimensionless quantity.

The difference is

• Biot number: thermal conductivity is of solid.  

• Nusselt number: thermal conductivity is of fluid  

Answer 2

Answer:

Q14. The ratio of energy transferred by convection to

that by conduction is called

(A) Stanton number

(B) Nusselt number

(C) Biot number

(D) Preclet number