Question:
In a rising film evaporator, the liquid movement is due to
In a rising film evaporator, the liquid movement is due to
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Rising = Vapour lift; Falling = Gravity.
Updated On: May 25, 2026
- Mechanical agitation
- External pump
- Vapour lift
- Gravity flow
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The Correct Option is C
Solution and Explanation
Step 1: Concept
A rising film evaporator is a type of heat exchanger used to concentrate solutions, particularly those that are heat-sensitive.
Step 2: Meaning
Liquid movement refers to how the feed travels up the long vertical tubes during the evaporation process.
Step 3: Analysis
As the liquid is heated, it begins to boil and forms bubbles of vapour. This vapour expands and travels up the tube at high velocity, dragging a thin film of liquid along the tube walls.
Step 4: Conclusion
This phenomenon is specifically known as "vapour lift," which drives the liquid upward against gravity. Final Answer: (C)
A rising film evaporator is a type of heat exchanger used to concentrate solutions, particularly those that are heat-sensitive.
Step 2: Meaning
Liquid movement refers to how the feed travels up the long vertical tubes during the evaporation process.
Step 3: Analysis
As the liquid is heated, it begins to boil and forms bubbles of vapour. This vapour expands and travels up the tube at high velocity, dragging a thin film of liquid along the tube walls.
Step 4: Conclusion
This phenomenon is specifically known as "vapour lift," which drives the liquid upward against gravity. Final Answer: (C)
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