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Heat Transfer

Heat Transfer
Reynold's analogy states that (where, St = Stanton number f = friction factor)

St = 4f
St = f/2
St = f1/2
St = f/4

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Heat Transfer
In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms⁻². Neglecting the heat capacity of agitator, the temperature of water (in °C) is

40.5
26.8
25
34.4

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Heat Transfer
Heat waves

Can not pass through vacuum
Travel in straight line
Both B and C
Can be reflected by a mirror

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Heat Transfer
For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is

Nu = 0.023 Re0.8 . Pr0.4
Nu = Gz
Nu = 2Gz0.5
Nu = Gz

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Heat Transfer
The units of resistance to heat transfer is

W.m⁻².K⁻¹
J.m⁻².K⁻¹
J.m⁻¹.K⁻¹
W⁻¹m²K

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Heat Transfer
A graph between __________ is called Wilson plot.

1/U Vs . 1/V
1/U Vs . 1/v0.8
V0.8 Vs . U
1/v0.8 Vs . U

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