convection pretest

Convection heat transfer, as a diffusion process in moving medium, can best be

classified according to

• Conservation of mass principle

• Conservation of energy principle

• Reynolds Experiment

• Grashof Experiment

convection is usually known to deal with _________

• inviscid

  compressible flow

• viscous

  compressible flow

• incompressible

  viscous flows

• all types of fluid flow

the ratio of convective heat transfer to conductive heat transfer across a fluid layer

• Prandtle Number

• Nusselt Number

• Grashof Number

• Eckert Number

Ratio of kinetic energy to enthalpy in a fluid

• Nusselt No.

• Grashof No.

• Prandtle No.

• Eckert No.

Compares the internal resistance to the external resistance in a fluid dynamics

• Reynolds No.

• Richardson No.

• Graetz No.

• Biot No.

Compares the heat transfer by convection to the heat transfer by conduction

• Peclet No.

• Stanton No.

• Grashof No.

• Rayleigh No.

Buoyancy force/Inertia force in free or forced convection

• Graetz No.

• Biot No.

• Richardson No.

• Mach No.

the ratio of thew molecular diffusivity of momentum and the molecular diffusivity of heat

• Peclet No.

• Prandtle No.

• Fourier No.

Which of the following is not used as a boundary condition in convection problems?

• Constant Heat flux on the wall

• Constant wall temperature

• Constant internal heat generation

• all of these

Nu for laminar flow on circular tube for a fully developed flow with constant heat rate boundary condition is ______ comapred to the same flow but with contant wall temperature

• smaller

• bigger

• the same