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Heat and Mass Transfer

Heat and Mass Transfer
The amount of radiation mainly depends on

All of these
Temperature of body
Type of surface of body
Nature of body

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Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in

Boiler furnaces
Melting of ice
Condensation of steam in condenser
None of these

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

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Heat and Mass Transfer
Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

h = S/ρk
h = kρ/S
h = k/ ρS
h = ρS/k

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

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Heat and Mass Transfer
Moisture would find its way into insulation by vapour pressure unless it is prevented by

High thickness of insulation
A vapour seal
Less thermal conductivity insulator
High vapour pressure

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