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Heat Transfer

Heat Transfer
Maximum heat transfer rate is achieved in __________ flow.

Co-current
Laminar
Counter-current
Turbulent

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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
Prandtl number is the reciprocal of

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

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Heat Transfer
Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids?

Dittus-Boeltier equation
Nusselt equation
None of these
Sieder-Tate equation

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Heat Transfer
__________ paint has the minimum absorption co-efficient.

Black
White lead
Light cream
Grey

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Heat Transfer
For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.

No
Low
Extremely low
High

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