Question

Biot number signifies the ratio of

• A.
  
  Convective resistance in the fluid to conductive resistance in the solid
• B.
  
  Conductive resistance in the solid to convective resistance in the fluid
• C.
  Inertia force to viscous force in the fluid
• D.
  
  buoyancy force to viscous force in the fluid

Answer 1

The correct option is B


Conductive resistance in the solid to convective resistance in the fluid
Biot number,

$Bi=\frac{hl}{k}=\frac{\frac{l}{kA}}{\frac{1}{hA}}$
$Bi=\frac{\text{Conductive resistance of solid}}{\text{Convective resistance of fluid}}$