Normally, the ratio of the total riser area to the tower cross sectional area (for bubble cap towers of diameter more than 3 ft) is around_______________?
Correct answer: B. 0.1-0.2
- A. 0.4-0.6
- B. 0.1-0.2
- C. 0.35-0.75
- D. 0.55-0.85
Explanation
In large bubble-cap towers, the combined riser area is typically only about 10 to 20 percent of the tower cross-sectional area. This provides sufficient vapour passage while retaining enough tray area for liquid flow and contacting.
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