If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid_________________?
Correct answer: D. Decreases
- A. Remains unchanged
- B. Increases
- C. Increases or decreases depending on number of shell passes
- D. Decreases
Explanation
Increasing baffle spacing enlarges the shell-side flow area, so shell-side mass velocity and fluid velocity fall. Since Reynolds number is proportional to mass velocity for a given equivalent diameter and viscosity, it decreases.
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