Test: Heat Transfer By Natural Convection - 1 - Mechanical Engineering MCQ

cooling of internal combustion engines

flow of water inside the condenser tubes

cooling of billets in atmosphere

air-conditioning installations and nuclear reactors

Stanton number

Schmidt number

Grashoff number

Peclet number

Nusselt number represents the ratio of temperature gradient at the surface, to an overall or reference temperature gradient

Nusselt number represents the dimensionless slope of the temperature distribution curve at the surface

The convective coefficient can be evaluated from a knowledge of fluid temperature distribution in the neighbourhood of the surface

For a given Nusselt number, the convective coefficient is inversely proportional to thermal conductivity of the fluid.

Grashoff number

Prandtl number

Mach number

Nusselt number

a

b

c

d

Re

Gr

Gr/Re²

Nu/Re²

Rayleigh number

 Prandtl number, Grashoff's number

Raynolds number

Prandtl number

Nu = f (Re, Pr)

Nu = f (Re, Gr, Pr)

Nu = f(Ra)

Nu = f(Re, Gr)

Water

Liquid metal

Aqueous solution

Lube oil

Gr and Gr^1/4

Gr^1/3 and Gr^1/4

Gr^1/4 and Gr^1/3

Gr^1/4 and Gr^1/5