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Heat Transfer

Heat Transfer
Reynold's analogy states that

Nst α NRe
Nst α f
NNu α f
NRe α f

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Heat Transfer
Harmonic mean temperature difference is given by

2.(ΔT₁ . ΔT₂)(ΔT₁ - ΔT₂)
2.(ΔT₁ . ΔT₂)/(ΔT₁ + ΔT₂)
√(ΔT₁ . ΔT₂)
(ΔT₁ - ΔT₂)/(ΔT₁ . ΔT₂)

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Heat Transfer
For a given ambient air temperature with increase in the thickness of insulation of a hot cylinderical pipe, the rate of heat loss from the surface would

First decrease and then increase
Increase
Decrease
First increase and then decrease

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Heat Transfer
Prandtl number is the reciprocal of

Mass diffusivity x Momentum diffusivity
Thermal diffusivity/Momentum diffusivity
Thermal diffusivity x Mass diffusivity
Thermal diffusivity x Momentum

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Heat Transfer
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.

1
None of these
4.88
1.49

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Heat Transfer
Black liquor generated during paper manufacture is concentrated in a

single effect evaporator
multiple effect evaporator
multiple effect evaporators followed by a crystalliser
single effect evaporator followed by a crystalliser

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