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

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

In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass __________ through the heat exchanger.

A

Once

B

Twice

C

Thrice

D

Four times

Baffles in the shell side of a shell and tube heat exchanger

A

Increase the cross-section of the shell side liquid

B

Force the liquid to flow parallel to the bank

C

Increase the shell side heat transfer co-efficient

D

Decrease the shell side heat transfer co-efficient

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

For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it

A

Decreases the pressure drop

B

Decreases the outlet temperature of cooling medium

C

Increases the overall heat transfer coefficient

D

None of these

A concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires

A

Less heating surface

B

More space

C

Lower maintenance cost

D

None of these

In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is

A

Infinity

B

Zero

C

Same as average heat transfer co-efficient for tube side

D

None of these

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

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