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Heat Transfer

Heat Transfer
(NRe.NPr)(D/L) is called the __________ number

Peclet
None of these
Stanton
Graetz

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Heat Transfer
Value of Prandtl number for water ranges from

L to 2
100 to 500
1000 to 2000
5 to 10

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Heat Transfer
Fourier's law of heat conduction applies to __________ surfaces.

Neither A and B
Non-isothermal
Both A and B
Isothermal

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Heat Transfer
The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium. This is __________ law.

Planck's
Stefan-Boltzman
Kirchoffs
Wien's displacement

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Heat Transfer
Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is

L
< 1
>1
0.1

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Heat Transfer
What is the geometric mean of two heat transfer areas A₁ and A₂ ?

1/2 √(A₁ . A₂)
2 √(A₁ . A₂)
√(A₁ + A₂)
√(A₁ . A₂)

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