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QUESTION: 1

Which of the following heat flow situations pertains to free or natural convection?

Solution:

QUESTION: 2

The dimensionless parameter is referred to as

Solution:

QUESTION: 3

Choose the wrong statement with respect to Nusselt number and convective heat transfer coefficient

Solution:

QUESTION: 4

Which one of the following number represents the ratio of kinematic viscosity to thermal diffusivity?

Solution:

Prandtl number is the ratio of two transport properties i.e the ratio of momentum diffusivity and thermal diffusivity. Prandtl number controls the relation between the velocity and temperature distributions.

QUESTION: 5

Consider the following boundary layer for natural convection on a vertical plate and match accordingly:

Solution:

AA : Turbulent region on hot wall

BB : Laminar region on hot wall

CC: Laminar region on cold wall

DD: Turbulent region on cold wall

EE : Velocity profile for hot wall

FF : Velocity profile for cold wall

GG: Boundary layer for cold wall

HH : Boundary layer for hot wall..

QUESTION: 6

Which of the following parameter is a measure of the relative importance of natural convection in relation to forced convection?

All empirical parameters have their usual meaning.

Solution:

If (Gr/Re^{2}) << 1, flow is primarily by forced convection

If (Gr/Re^{2}) >> 1, flow is dominant by natural convection

If (Gr/Re^{2}) ≌ 1, natural and forced convection are of same magnitude.

QUESTION: 7

This value governs the transition from laminar to turbulent flow in natural convection:

Solution:

The Grashoff number in natural convection plays the same role as the Reynolds number in forced convection because it is the ratio of buoyancy force to the viscous force.

QUESTION: 8

The empirical correlation for natural convection is represented by

All empirical parameters have their usual meaning.

Solution:

QUESTION: 9

The Prandtl number will be lowest for

Solution:

QUESTION: 10

In respect of free convection over a vertical flat plate, the Nusselt number for laminar and turbulent flow varies respectively as

Solution:

for vertical plate,

Nu = 0.59 Ra^{1/4} for 10^{4} < Ra < 10^{9 }

Nu = 0.13 Ra^{1/3} for 10^{10} < Ra < 10^{13}

### Heat Transfer by Natural Convection - 2

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