# Heat Transfer Operations Questions and Answers – Shell and Tube Heat Exchangers – Concurrent and Countercurrent Operation

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This set of Heat Transfer Operations Multiple Choice Questions & Answers (MCQs) focuses on “Shell and Tube Heat Exchangers – Concurrent and Countercurrent Operation”.

1. In a shell and tube heat exchanger, the flow pattern is usually ________
a) Concurrent
b) Counter current
c) Concurrent at a part and Counter current at the other
d) Mixed flow

Explanation: In a shell and tube HE when the fluids are flowing in their respective paths, there are regions where both Concurrent and Counter current flow is observed.

2. In a 2-4 Shell and Tube heat exchanger, how many concurrent and counter current flow regimes are observed?
a) 2 concurrent and 2 counter current
b) 1 concurrent and 1 counter current
c) 4 concurrent and 0 counter current
d) 0 concurrent and 4 counter current

Explanation: In a 2-4 Shell and Tube heat exchanger, we observe alternate concurrent and counter current flow regimes, as there are total 4 interaction areas, we get alternating 2 concurrent and 2 counter current flow patterns.

3. In the following Figure determine the number of Concurrent flow and Counter-current flow regime. a) 2 concurrent and 2 counter current
b) 1 concurrent and 1 counter current
c) 2 concurrent and 0 counter current
d) 0 concurrent and 2 counter current

Explanation: In the temperature pattern shown above, we observe alternate concurrent and counter current flow regimes, as there are total 2 interaction areas, we get alternating 1 concurrent(Tc2-TH) and 1 counter current(Tc1-TH) flow patterns.
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4. In a 1-2 Shell and Tube heat exchanger, how many concurrent and counter current flow regimes are observed?
a) 2 concurrent and 2 counter current
b) 1 concurrent and 1 counter current
c) 4 concurrent and 0 counter current
d) 0 concurrent and 4 counter current

Explanation: In a 1-2 Shell and Tube heat exchanger, we observe alternate concurrent and counter current flow regimes, as there are total 2 interaction areas, we get alternating 1 concurrent and 1 counter current flow patterns.

5. In the following Figure determine the number of Concurrent flow and Counter-current flow regime. a) 2 concurrent and 2 counter current
b) 1 concurrent and 1 counter current
c) 2 concurrent and 0 counter current
d) 0 concurrent and 2 counter current

Explanation: In the temperature pattern shown above, we observe alternate concurrent and counter current flow regimes. Looking at the region THA to Ti, there is a single Concurrent and Counter-current interaction, as there are total 2 interaction areas, we get alternating 2 concurrent and 2 counter current flow patterns.

6. In a shell and tube Heat exchanger, sometimes flow regimes cannot be expressed as concurrent or counter-current.
a) True
b) False

Explanation: Flow regimes can always be represented by counter-current and concurrent by any point of consideration in the setup as possible. This is because the fluid in contact with the tube always has a direction of flow.

7. In the following shell and tube setup as shown, recognise the number of Concurrent and Counter-current interactions. a) 2 concurrent and 4 counter current
b) 3 concurrent and 3 counter current
c) 6 concurrent and 0 counter current
d) 0 concurrent and 6 counter current

Explanation: In the setup shown above, we observe alternate concurrent and counter current flow regimes. Looking at the region THA to Ti, there is a single Concurrent and Counter-current interaction, as there are total 3 interaction areas, we get alternating 3 concurrent and 3 counter current flow patterns. AB – Counter-current
BC – Con-current
CD – Counter-current
DE – Con-current
EF – Counter-current
FG – Con-current.

8. What is the total number of counter-current flow regime in the given setup of split flow? a) 1
b) 2
c) 3
d) 4

9. What is the total number of counter-current flow regime in the given setup of double split flow? a) 1
b) 2
c) 3
d) 4

10. What is the total number of concurrent flow regime in the given setup of Shell and Tube HE? a) 1
b) 2
c) 3
d) 0

Explanation: We can observe by the given flow, that the number of concurrent regime is 0 and is totally counter current as is visible from the fact that the flow at every point is opposite to that in tube.

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