Which of the following terms describes when the tube-side stream and the shell-side stream flow in opposite directions?
a. Cross flow
b. Parallel flow
c. Turbulent flow
d. Countercurrent flow
a. Incorrect. Cross flow occurs when two streams move perpendicular to each other.
b. Incorrect. Parallel flow occurs when the streams on both the shell and tube sides move in the same direction.
c. Incorrect. Turbulent flow is a condition in which fluid flow patterns are disturbed so there is considerable mixing.
d. Correct. Countercurrent flow occurs when the tube-side stream and the shell-side stream flow in opposite directions.
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