In a gas-liquid shell and tube heat exchanger, the

Heat Transfer
In a gas-liquid shell and tube heat exchanger, the

Gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes

All of these

Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature

Presence of a non-condensible gas decreases the condensing film co-efficient

Gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes

All of these

Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature

Presence of a non-condensible gas decreases the condensing film co-efficient

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Heat Transfer
Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for

Equal for all the three

Cube

Sphere

Cylinder

Equal for all the three

Cube

Sphere

Cylinder

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Heat Transfer
Choose the correct equation.

Nu = (Re) (Pr) (St)

Nu = (Re)(Pr)

Nu = (Re) (Pr) (Gz)

Nu = (Pr)(St)

Nu = (Re) (Pr) (St)

Nu = (Re)(Pr)

Nu = (Re) (Pr) (Gz)

Nu = (Pr)(St)

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Heat Transfer
Among liquids, water has a comparatively high value of thermal conductivity, due to its

Dense structure

Low density

Partial ionisation

High viscosity

Dense structure

Low density

Partial ionisation

High viscosity

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Heat Transfer
In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of

Concentrations

Mass transfer co-efficients

Chemical potentials

Activity co-efficients

Concentrations

Mass transfer co-efficients

Chemical potentials

Activity co-efficients

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Heat Transfer
Finned tube heat exchangers

are used for smaller heat load

use metal fins of low thermal conductivity

facilitate very large temperature drop through tube wall

give larger area per tube

are used for smaller heat load

use metal fins of low thermal conductivity

facilitate very large temperature drop through tube wall

give larger area per tube

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Heat Transfer

Heat Transfer In a gas-liquid shell and tube heat exchanger, the

Heat Transfer Choose the correct equation.

Heat Transfer Among liquids, water has a comparatively high value of thermal conductivity, due to its

Heat Transfer In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of

Heat Transfer Finned tube heat exchangers

Heat Transfer
In a gas-liquid shell and tube heat exchanger, the

Heat Transfer
Choose the correct equation.

Heat Transfer
Among liquids, water has a comparatively high value of thermal conductivity, due to its

Heat Transfer
In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of

Heat Transfer
Finned tube heat exchangers