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Heat and Mass Transfer

Heat and Mass Transfer
Emissivity of a white polished body in comparison to a black body is

Higher
Same
Depends upon the shape of body
Lower

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Heat and Mass Transfer
The rate of energy transferred by convection to that by conduction is called

Nusselt number
Peclet number
Stanton number
Biot number

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Heat and Mass Transfer
Depending on the radiating properties, body will be transparent when (Where a = absorptivity, p = reflectivity, x = transmissivity)

P = 0, x= 1, and a = 0
P = 0, x = 0 and a = 1
X = 0, a + p = 1
P=1, x = 0, and a = 0

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Heat and Mass Transfer
According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a

Red hot body
Brilliant white polished body
Grey body
Black body

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Heat and Mass Transfer
Depending on the radiating properties, a body will be black when (Where a = absorptivity, p = reflectivity, X = transmissivity.)

P= 1, T = 0 and a = 0
P = 0, x = 0 and a = 1
X = 0, a + p = 0
P = 0, x = 1 and a = 0

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Heat and Mass Transfer
A composite slab has two layers of different materials with thermal conductivities k₁ and k₂. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be

(k₁ + k₂)/ k₁ k₂
k₁ k₂
2 k₁ k₂/ (k₁ + k₂)
(k₁ + k₂)

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