Baffles are provided in heat exchangers to increase the

Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle?

A

Segmental baffle

B

Flat plate extending across the wall

C

Disk type baffle

D

Helical type baffle

Indirect contact heat exchangers are preferred over direct contact heat exchangers, because

A

Heat transfer co-efficient are high

B

There is no risk of contamination

C

There is no mist formation

D

Cost of equipment is lower

Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

A

Finned tube heat exchanger with air inside and steam outside

B

Finned tube heat exchanger with air outside and steam inside

C

Shell and tube heat exchanger with air inside tubes and steam on shell side

D

Shell and tube heat exchanger with air on shell side and steam inside tubes

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

A

Facilitate the cleaning of outer tube surface

B

Enhance turbulence

C

Hold the tubes in position

D

All of the above

In a shell and tube heat exchanger, baffles are provided on the shell side to

A

Improve heat transfer

B

Provide support for tubes

C

Prevent stagnation of shell side fluid

D

All of these

Baffles provided on the shell side of a shell and tube heat exchanger are meant for

A

Providing support for the tubes

B

Improving heat transfer

C

Both A & B

D

Preventing the fouling of tubes & stagnation of shell side fluid

In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for

A

Reducing scale deposition

B

Increasing pressure drop

C

Fixing the tubes

D

Creating turbulence

Use of transverse baffles in a shell and tube heat exchanger is done to increase the

A

Rate of heat transfer

B

Flow velocity

C

Turbulence of shell side fluid

D

All of the above

Baffles in mixing tanks are provided to

A

Reduce swirling and vortex formation

B

Increase the structural strength of the tank

C

Aid in rotational flow

D

None of these

In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in

A

Reducing the axial mixing

B

Increasing the rate of extraction

C

Maintaining the concentration difference between the two phases

D

All of the above

Baffles are provided in heat exchangers to increase the

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