EXAMIANS
Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in
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Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)
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The heat transfer by conduction through a thick cylinder (Q) is given by (where T₁ = Higher temperature, T₂ = Lower temperature, r₁ = Inside radius, r₂ = Outside radius, l = Length of cylinder, and k = Thermal conductivity)
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A perfect black body is one which
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Depending on the radiating properties, a body will be black when (Where a = absorptivity, p = reflectivity, X = transmissivity.)
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The expression Q = ρ AT4 is called
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Heat transfer in liquid and gases takes place by
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Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.
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Reynolds number is the ratio of
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Heat flows from one body to other when they have
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