Exam 7: Heat Transfer and Heat Exchangers: Part B

A fluid is flowing inside the inner tube of a double pipe heat exchanger with diameter 'd'. For a fixed mass flow rate, the tube side heat transfer co-efficient for turbulent flow conditions is proportional to

The ratio of total radiating power to the absorptivity of the body depends upon the __________ as per Kirchoff?s law.

For small temperature difference, the heat transfer rate as per Newton's law of cooling is proportional to (where, ?t = excess temperature)

Air is best heated with steam in a heat exchanger of

Which of the following is concerned with both heat and mass transfer?

What is the steam economy in case of a single effect evaporator system?

Steam side heat transfer co-efficient in an evaporator is in the range of __________ kcal/hr.m² °C.

Duhring?s rule is important in solving problems on

Pick out the wrong statement.

The ratio of momentum diffusivity to thermal diffusivity is the __________ number.

Which is the most suitable for the concentration of foamy & frothy liquors?

A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m² .K. The Biot number is

Log mean temperature difference (LMTD) cannot be used, if

The most conducive surface for dropwise condensation to occur is the __________ surface.

The main function of baffles provided in a shell and tube heat exchanger is to

If air (a non-condensing gas) is present in a condensing vapor stream, it will __________ the condensation rate of vapor.

The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (?T) between wall and outside bulk. The proportionality is given as

Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer.

Pick out the wrong statement:

Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called