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All the following statements are correct, except
- a)Nucleate boiling gets promoted on a smooth surface
- b)In subcooled heating, the temperature of the heating surface is more than the boiling point of the liquid
- c)Film boiling region is usually avoided in commercial equipment
- d)There occurs transition from nucleate to film boiling burn-out point on the boiling curve
Correct answer is option 'A'. Can you explain this answer?
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All the following statements are correct, excepta)Nucleate boiling get...
A rough surface gives a better heat transmission than when the surface is either smooth or has been coated to weak its tendency to get wetted.
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All the following statements are correct, excepta)Nucleate boiling get...
Nucleate boiling is a process in which bubbles form at sites called nucleation sites on a heated surface. These bubbles then rise to the surface and release heat into the surrounding liquid. On the other hand, film boiling is a process in which a vapor film forms on the heated surface, preventing direct contact between the liquid and the surface.
a) Nucleate boiling gets promoted on a smooth surface
This statement is incorrect. Nucleate boiling is actually promoted on a rough surface rather than a smooth one. The rough surface provides more nucleation sites for bubble formation, which enhances the heat transfer process. A smooth surface, on the other hand, has fewer nucleation sites and may result in delayed or suppressed nucleate boiling.
b) In subcooled heating, the temperature of the heating surface is more than the boiling point of the liquid
This statement is correct. Subcooled heating refers to heating a liquid below its boiling point. In this case, the temperature of the heating surface is higher than the boiling point of the liquid. The heat transfer occurs through conduction, and no phase change takes place.
c) Film boiling region is usually avoided in commercial equipment
This statement is correct. Film boiling is generally avoided in commercial equipment because it can lead to a significant reduction in heat transfer efficiency. The vapor film acts as a thermal insulator, reducing the contact between the heated surface and the liquid, which hampers heat transfer. Film boiling is more common in high-temperature and high-pressure systems where the surface temperature exceeds the Leidenfrost point.
d) There occurs a transition from nucleate to film boiling burn-out point on the boiling curve
This statement is correct. On a boiling curve, there is a transition point from nucleate boiling to film boiling, known as the burn-out point. At this point, the heat transfer coefficient decreases significantly as the vapor film becomes stable and hinders heat transfer. This transition is important to consider in the design and operation of boiling systems to prevent burn-out and ensure efficient heat transfer.
In summary, all the statements given in the question are correct except for statement a) which states that nucleate boiling gets promoted on a smooth surface.
a) Nucleate boiling gets promoted on a smooth surface
This statement is incorrect. Nucleate boiling is actually promoted on a rough surface rather than a smooth one. The rough surface provides more nucleation sites for bubble formation, which enhances the heat transfer process. A smooth surface, on the other hand, has fewer nucleation sites and may result in delayed or suppressed nucleate boiling.
b) In subcooled heating, the temperature of the heating surface is more than the boiling point of the liquid
This statement is correct. Subcooled heating refers to heating a liquid below its boiling point. In this case, the temperature of the heating surface is higher than the boiling point of the liquid. The heat transfer occurs through conduction, and no phase change takes place.
c) Film boiling region is usually avoided in commercial equipment
This statement is correct. Film boiling is generally avoided in commercial equipment because it can lead to a significant reduction in heat transfer efficiency. The vapor film acts as a thermal insulator, reducing the contact between the heated surface and the liquid, which hampers heat transfer. Film boiling is more common in high-temperature and high-pressure systems where the surface temperature exceeds the Leidenfrost point.
d) There occurs a transition from nucleate to film boiling burn-out point on the boiling curve
This statement is correct. On a boiling curve, there is a transition point from nucleate boiling to film boiling, known as the burn-out point. At this point, the heat transfer coefficient decreases significantly as the vapor film becomes stable and hinders heat transfer. This transition is important to consider in the design and operation of boiling systems to prevent burn-out and ensure efficient heat transfer.
In summary, all the statements given in the question are correct except for statement a) which states that nucleate boiling gets promoted on a smooth surface.
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All the following statements are correct, excepta)Nucleate boiling gets promoted on a smooth surfaceb)In subcooled heating, the temperature of the heating surface is more than the boiling point of the liquidc)Film boiling region is usually avoided in commercial equipmentd)There occurs transition from nucleate to film boiling burn-out point on the boiling curveCorrect answer is option 'A'. Can you explain this answer?
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All the following statements are correct, excepta)Nucleate boiling gets promoted on a smooth surfaceb)In subcooled heating, the temperature of the heating surface is more than the boiling point of the liquidc)Film boiling region is usually avoided in commercial equipmentd)There occurs transition from nucleate to film boiling burn-out point on the boiling curveCorrect answer is option 'A'. Can you explain this answer? for Chemical Engineering 2024 is part of Chemical Engineering preparation. The Question and answers have been prepared according to the Chemical Engineering exam syllabus. Information about All the following statements are correct, excepta)Nucleate boiling gets promoted on a smooth surfaceb)In subcooled heating, the temperature of the heating surface is more than the boiling point of the liquidc)Film boiling region is usually avoided in commercial equipmentd)There occurs transition from nucleate to film boiling burn-out point on the boiling curveCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Chemical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for All the following statements are correct, excepta)Nucleate boiling gets promoted on a smooth surfaceb)In subcooled heating, the temperature of the heating surface is more than the boiling point of the liquidc)Film boiling region is usually avoided in commercial equipmentd)There occurs transition from nucleate to film boiling burn-out point on the boiling curveCorrect answer is option 'A'. Can you explain this answer?.
All the following statements are correct, excepta)Nucleate boiling gets promoted on a smooth surfaceb)In subcooled heating, the temperature of the heating surface is more than the boiling point of the liquidc)Film boiling region is usually avoided in commercial equipmentd)There occurs transition from nucleate to film boiling burn-out point on the boiling curveCorrect answer is option 'A'. Can you explain this answer? for Chemical Engineering 2024 is part of Chemical Engineering preparation. The Question and answers have been prepared according to the Chemical Engineering exam syllabus. Information about All the following statements are correct, excepta)Nucleate boiling gets promoted on a smooth surfaceb)In subcooled heating, the temperature of the heating surface is more than the boiling point of the liquidc)Film boiling region is usually avoided in commercial equipmentd)There occurs transition from nucleate to film boiling burn-out point on the boiling curveCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Chemical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for All the following statements are correct, excepta)Nucleate boiling gets promoted on a smooth surfaceb)In subcooled heating, the temperature of the heating surface is more than the boiling point of the liquidc)Film boiling region is usually avoided in commercial equipmentd)There occurs transition from nucleate to film boiling burn-out point on the boiling curveCorrect answer is option 'A'. Can you explain this answer?.
Solutions for All the following statements are correct, excepta)Nucleate boiling gets promoted on a smooth surfaceb)In subcooled heating, the temperature of the heating surface is more than the boiling point of the liquidc)Film boiling region is usually avoided in commercial equipmentd)There occurs transition from nucleate to film boiling burn-out point on the boiling curveCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Chemical Engineering.
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All the following statements are correct, excepta)Nucleate boiling gets promoted on a smooth surfaceb)In subcooled heating, the temperature of the heating surface is more than the boiling point of the liquidc)Film boiling region is usually avoided in commercial equipmentd)There occurs transition from nucleate to film boiling burn-out point on the boiling curveCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for All the following statements are correct, excepta)Nucleate boiling gets promoted on a smooth surfaceb)In subcooled heating, the temperature of the heating surface is more than the boiling point of the liquidc)Film boiling region is usually avoided in commercial equipmentd)There occurs transition from nucleate to film boiling burn-out point on the boiling curveCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of All the following statements are correct, excepta)Nucleate boiling gets promoted on a smooth surfaceb)In subcooled heating, the temperature of the heating surface is more than the boiling point of the liquidc)Film boiling region is usually avoided in commercial equipmentd)There occurs transition from nucleate to film boiling burn-out point on the boiling curveCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
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