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Heat Transfer

Heat Transfer
jH factor for heat transfer depends upon the __________ number.

Prandtl
Reynolds
Nusselt
Biot

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Heat Transfer
The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is

4
43832
2
43834

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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

Chemical potentials
Activity co-efficients
Concentrations
Mass transfer co-efficients

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Heat Transfer
The purpose of floating head in a heat exchanger is to

Provide support for tubes
Avoid buckling of tubes
Facilitate its lengthening, if needed
Decrease the pressure drop

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Heat Transfer
Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

Exit fluid temperature < wall temperature
Exit-fluid temperature > wall temperature
Exit fluid temperature = wall temperature
Graetz number > 100

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Heat Transfer
Rate of heat transfer by vaporisation from pools of water is affected by the

Surface tension of water
Viscosity of water
Nature of heating surface and distribution of bubbles
All of these

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