Heat Transfer

all (a), (b) and (c).

both (b) and (c).

double pipe type with fin on air side.

Both (b) and (c)

multiple effect evaporator.

nucleate boiling

increases

conduction

none of these.

logarithmic mean temperature difference.

decreases

absorptivity = 1

34.4

accounts for additional resistances to heat flow.

decreases

create vacuum.

passes through a maxima

32

relieve stresses caused by thermal expansion.

boiling of a liquid on a hot surface.

counter flow with process stream on shell side.

Orifice baffles are never used in a shell and tube heat exchanger.

highly turbulent

all (a), (b) and (c).

mercury

none of these.

both (a) & (b)

increases.

foaming of the solution.

increase the shell side heat transfer co-efficient.

finned tube heat exchanger with air outside and steam inside.

economy

The equivalent diameter of heat transfer for a duct of square cross-section (having each side as 'x') is equal to 4x.

boiling point elevations

decreased capacity.

smaller than

the largest

35°C

both (a) & (b)

In case of a 1 - 2 shell and tube heat exchanger, the LMTD correction factor value increases sharply, when a temperature cross occurs.

mainly confined to a thin film of fluid near the surface.

Lewis relationship

higher economy

less than that of the uninsulated steam pipe.