In a cross current-flow scrubber, what happens to gas velocity and efficiency when the cross-sectional area increases?

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Study for the PE Environmental Qualitative Exam. Practice with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

In a cross current-flow scrubber, what happens to gas velocity and efficiency when the cross-sectional area increases?

Explanation:
In a cross current-flow scrubber, gas velocity is set by the volumetric gas flow rate divided by the cross-sectional area. So when you increase the cross-sectional area while keeping the flow rate the same, the superficial gas velocity decreases. The removal efficiency in a cross-flow scrubber depends on how well the gas and liquid phases contact each other and transfer contaminants; slower gas flow reduces the interaction and mass-transfer opportunities between gas and liquid, leading to a lower removal efficiency. Therefore, increasing cross-sectional area tends to reduce both gas velocity and efficiency.

In a cross current-flow scrubber, gas velocity is set by the volumetric gas flow rate divided by the cross-sectional area. So when you increase the cross-sectional area while keeping the flow rate the same, the superficial gas velocity decreases. The removal efficiency in a cross-flow scrubber depends on how well the gas and liquid phases contact each other and transfer contaminants; slower gas flow reduces the interaction and mass-transfer opportunities between gas and liquid, leading to a lower removal efficiency. Therefore, increasing cross-sectional area tends to reduce both gas velocity and efficiency.

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