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Saturated steam is allowed to condense over a vertical flat surface and the condensate film flows down the surface. The local coefficient of heat transfer for condensation
- a)Remains constant at all heights of the surface
- b)Decreases with increasing distance from the top of the surface
- c)Increases with increasing thickness of film
- d)Increases with increasing temperature differential between the surface and vapour
Correct answer is option 'B'. Can you explain this answer?
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Saturated steam is allowed to condense over a vertical flat surface an...
It decreases with increasing thickness of condensate film.
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Saturated steam is allowed to condense over a vertical flat surface an...
Explanation:
When saturated steam is allowed to condense over a vertical flat surface, the condensate film flows down the surface due to gravity. During this process, the local coefficient of heat transfer for condensation changes.
The local coefficient of heat transfer for condensation is defined as the amount of heat transferred per unit area per unit time per unit temperature difference between the condensing surface and the vapor.
The coefficient of heat transfer for condensation varies with several parameters such as the height of the surface, the thickness of the film, and the temperature differential between the surface and vapor.
As the thickness of the film increases, the coefficient of heat transfer for condensation also increases. This is because a thicker film offers more resistance to heat transfer and causes the temperature gradient across the film to increase. As a result, the heat transfer rate increases.
On the other hand, as the distance from the top of the surface increases, the coefficient of heat transfer for condensation decreases. This is because the pressure of the vapor decreases with increasing height, causing a decrease in the driving force for condensation. As a result, the heat transfer rate decreases.
Therefore, the correct answer is option B - The local coefficient of heat transfer for condensation decreases with increasing distance from the top of the surface.
In summary:
- The coefficient of heat transfer for condensation varies with several parameters such as the height of the surface, the thickness of the film, and the temperature differential between the surface and vapor.
- As the thickness of the film increases, the coefficient of heat transfer for condensation also increases.
- As the distance from the top of the surface increases, the coefficient of heat transfer for condensation decreases.
When saturated steam is allowed to condense over a vertical flat surface, the condensate film flows down the surface due to gravity. During this process, the local coefficient of heat transfer for condensation changes.
The local coefficient of heat transfer for condensation is defined as the amount of heat transferred per unit area per unit time per unit temperature difference between the condensing surface and the vapor.
The coefficient of heat transfer for condensation varies with several parameters such as the height of the surface, the thickness of the film, and the temperature differential between the surface and vapor.
As the thickness of the film increases, the coefficient of heat transfer for condensation also increases. This is because a thicker film offers more resistance to heat transfer and causes the temperature gradient across the film to increase. As a result, the heat transfer rate increases.
On the other hand, as the distance from the top of the surface increases, the coefficient of heat transfer for condensation decreases. This is because the pressure of the vapor decreases with increasing height, causing a decrease in the driving force for condensation. As a result, the heat transfer rate decreases.
Therefore, the correct answer is option B - The local coefficient of heat transfer for condensation decreases with increasing distance from the top of the surface.
In summary:
- The coefficient of heat transfer for condensation varies with several parameters such as the height of the surface, the thickness of the film, and the temperature differential between the surface and vapor.
- As the thickness of the film increases, the coefficient of heat transfer for condensation also increases.
- As the distance from the top of the surface increases, the coefficient of heat transfer for condensation decreases.
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Saturated steam is allowed to condense over a vertical flat surface and the condensate film flows down the surface. The local coefficient of heat transfer for condensationa)Remains constant at all heights of the surfaceb)Decreases with increasing distance from the top of the surfacec)Increases with increasing thickness of filmd)Increases with increasing temperature differential between the surface and vapourCorrect answer is option 'B'. Can you explain this answer?
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Saturated steam is allowed to condense over a vertical flat surface and the condensate film flows down the surface. The local coefficient of heat transfer for condensationa)Remains constant at all heights of the surfaceb)Decreases with increasing distance from the top of the surfacec)Increases with increasing thickness of filmd)Increases with increasing temperature differential between the surface and vapourCorrect answer is option 'B'. 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 Saturated steam is allowed to condense over a vertical flat surface and the condensate film flows down the surface. The local coefficient of heat transfer for condensationa)Remains constant at all heights of the surfaceb)Decreases with increasing distance from the top of the surfacec)Increases with increasing thickness of filmd)Increases with increasing temperature differential between the surface and vapourCorrect answer is option 'B'. 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 Saturated steam is allowed to condense over a vertical flat surface and the condensate film flows down the surface. The local coefficient of heat transfer for condensationa)Remains constant at all heights of the surfaceb)Decreases with increasing distance from the top of the surfacec)Increases with increasing thickness of filmd)Increases with increasing temperature differential between the surface and vapourCorrect answer is option 'B'. Can you explain this answer?.
Saturated steam is allowed to condense over a vertical flat surface and the condensate film flows down the surface. The local coefficient of heat transfer for condensationa)Remains constant at all heights of the surfaceb)Decreases with increasing distance from the top of the surfacec)Increases with increasing thickness of filmd)Increases with increasing temperature differential between the surface and vapourCorrect answer is option 'B'. 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 Saturated steam is allowed to condense over a vertical flat surface and the condensate film flows down the surface. The local coefficient of heat transfer for condensationa)Remains constant at all heights of the surfaceb)Decreases with increasing distance from the top of the surfacec)Increases with increasing thickness of filmd)Increases with increasing temperature differential between the surface and vapourCorrect answer is option 'B'. 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 Saturated steam is allowed to condense over a vertical flat surface and the condensate film flows down the surface. The local coefficient of heat transfer for condensationa)Remains constant at all heights of the surfaceb)Decreases with increasing distance from the top of the surfacec)Increases with increasing thickness of filmd)Increases with increasing temperature differential between the surface and vapourCorrect answer is option 'B'. Can you explain this answer?.
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Saturated steam is allowed to condense over a vertical flat surface and the condensate film flows down the surface. The local coefficient of heat transfer for condensationa)Remains constant at all heights of the surfaceb)Decreases with increasing distance from the top of the surfacec)Increases with increasing thickness of filmd)Increases with increasing temperature differential between the surface and vapourCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for Saturated steam is allowed to condense over a vertical flat surface and the condensate film flows down the surface. The local coefficient of heat transfer for condensationa)Remains constant at all heights of the surfaceb)Decreases with increasing distance from the top of the surfacec)Increases with increasing thickness of filmd)Increases with increasing temperature differential between the surface and vapourCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of Saturated steam is allowed to condense over a vertical flat surface and the condensate film flows down the surface. The local coefficient of heat transfer for condensationa)Remains constant at all heights of the surfaceb)Decreases with increasing distance from the top of the surfacec)Increases with increasing thickness of filmd)Increases with increasing temperature differential between the surface and vapourCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
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