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QUESTION: 1

The convective heat transfer coefficient from a hot cylindrical surface exposed to still air varies in accordance with

Where ΔT is the temperature difference between the hot surface and surrounding ambient air.

Solution:

QUESTION: 2

The nusselt number of convective heat transfer between a horizontal tube and water surrounding it is prescribed by the relation Nu = 0.52 (Gr Pr)^{0.25} for a 5 cm diameter tube, the heat transfer coefficient is 6000 W/m^{2}-K. Subsequently, the tube is replaced by one with 20 cm diameter tube. If the temperature and surface of the fluid remain same, the heat transfer coefficient will change to

Solution:

∴

∴

= 4242W/m^{2}-K

QUESTION: 3

In convection heat transfer one of the significant dimensionless number is

Solution:

QUESTION: 4

Nusselt number in case of free convection is the function of

Solution:

For free convection

Nu = f(Gr, Pr)

Rayleigh number = Gr x Pr.

QUESTION: 5

When there is flow of fluid over a flat plate of length L the average heat transfer coefficient is given by (Nu_{x} = Local nusselt number)

Solution:

QUESTION: 6

The Grashoff number is

Solution:

QUESTION: 7

The temperature profile for heat transfer from one fluid to another separated by a solid wall is

Solution:

QUESTION: 8

Match List-I with List-II and select the correct

Solution:

### Problems: Heat Transfer by Natural Convection

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### Heat Transfer by Natural Convection - 2

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### Heat Transfer by Natural Convection - 3

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### Heat Transfer by Natural Convection - 1

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