A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m².°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be

Heat Transfer
A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m².°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be

Less than the steam pipe with 5 cms insulation

Equal to that of the uninsulated steam pipe

Greater than that for uninsulated steam pipe

Less than that of the uninsulated steam pipe

Less than the steam pipe with 5 cms insulation

Equal to that of the uninsulated steam pipe

Greater than that for uninsulated steam pipe

Less than that of the uninsulated steam pipe

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Heat Transfer
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is

120.36

2.36

4.36

Dependent on NRe only

120.36

2.36

4.36

Dependent on NRe only

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Heat Transfer
Prandtl number is the ratio of

Momentum diffusivity to thermal diffusivity

Momentum diffusivity to mass diffusivity

Thermal diffusivity to mass diffusivity

Thermal diffusivity to momentum diffusivity

Momentum diffusivity to thermal diffusivity

Momentum diffusivity to mass diffusivity

Thermal diffusivity to mass diffusivity

Thermal diffusivity to momentum diffusivity

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Heat Transfer
Leidenfrost point is a term concerned with the

Boiling of a liquid on a hot surface

Condensation of the saturated vapor on a cold surface

Concentration of a corrosive solution by evaporation

Heat transfer between two highly viscous liquids

Boiling of a liquid on a hot surface

Condensation of the saturated vapor on a cold surface

Concentration of a corrosive solution by evaporation

Heat transfer between two highly viscous liquids

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Heat Transfer
Low thermal conductivity of heat insulating materials is due to its

High specific heat

None of these

Dense structure

High proportion of air space

High specific heat

None of these

Dense structure

High proportion of air space

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Heat Transfer
(Cp . μ)/K is termed as the __________ number.

Nusselt

Prandtl

Stanton

Grashoff

Nusselt

Prandtl

Stanton

Grashoff

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Heat Transfer

Heat Transfer The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is

Heat Transfer Prandtl number is the ratio of

Heat Transfer Leidenfrost point is a term concerned with the

Heat Transfer Low thermal conductivity of heat insulating materials is due to its

Heat Transfer (Cp . μ)/K is termed as the __________ number.

Heat Transfer
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is

Heat Transfer
Prandtl number is the ratio of

Heat Transfer
Leidenfrost point is a term concerned with the

Heat Transfer
Low thermal conductivity of heat insulating materials is due to its

Heat Transfer
(Cp . μ)/K is termed as the __________ number.