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Consider the following statements regarding nucleate boiling
(i) The temperature of the surface is greater than the saturation temperature of the liquid
(ii) Bubbles are created by the expansion of entrapped gas oil vapor at small cavities in the surface
(iii) The temperature is greater than that in film boiling
(iv) The heat transfer from the surface to the liquid is greater than that in the film boiling
Which of these statements are correct?
(i) The temperature of the surface is greater than the saturation temperature of the liquid
(ii) Bubbles are created by the expansion of entrapped gas oil vapor at small cavities in the surface
(iii) The temperature is greater than that in film boiling
(iv) The heat transfer from the surface to the liquid is greater than that in the film boiling
Which of these statements are correct?
- a)1 and 3
- b)1, 2 and 4
- c)2, 3 and 4
- d)1, 2 and 3
Correct answer is option 'B'. Can you explain this answer?
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Consider the following statements regarding nucleate boiling(i) The te...
The temperature must be less than that in film boiling.
Most Upvoted Answer
Consider the following statements regarding nucleate boiling(i) The te...
Nucleate boiling is a process in which bubbles are formed at the surface of a heated liquid due to the rapid evaporation of the liquid. This process is commonly observed in applications such as boiling water on a stove. Let's analyze each statement and determine which ones are correct.
(i) The temperature of the surface is greater than the saturation temperature of the liquid:
This statement is correct. In nucleate boiling, the surface temperature is higher than the saturation temperature of the liquid. This temperature difference is known as the superheat. It is necessary for the liquid to be superheated in order for nucleate boiling to occur.
(ii) Bubbles are created by the expansion of entrapped gas or vapor at small cavities in the surface:
This statement is correct. Nucleate boiling occurs when small cavities or irregularities on the heated surface act as nucleation sites for bubble formation. These cavities can be microscopic imperfections or roughness on the surface. As the liquid comes into contact with these sites, it rapidly vaporizes and forms bubbles. The expansion of entrapped gas or vapor within these bubbles creates the characteristic boiling effect.
(iii) The temperature is greater than that in film boiling:
This statement is incorrect. In film boiling, which is a more advanced stage of boiling, a thin film of vapor covers the surface and inhibits direct contact between the liquid and the surface. This results in a lower heat transfer rate compared to nucleate boiling. However, in nucleate boiling, the temperature is typically lower than in film boiling due to the rapid vaporization of the liquid at the surface.
(iv) The heat transfer from the surface to the liquid is greater than that in film boiling:
This statement is correct. Nucleate boiling is known for its high heat transfer rates. The formation and collapse of bubbles at the surface enhances convective heat transfer, resulting in efficient heat transfer from the surface to the liquid. In film boiling, on the other hand, the vapor film acts as a thermal insulator and reduces the heat transfer rate.
In conclusion, statements (i), (ii), and (iv) are correct, while statement (iii) is incorrect. Therefore, the correct answer is option B: 1, 2, and 4.
(i) The temperature of the surface is greater than the saturation temperature of the liquid:
This statement is correct. In nucleate boiling, the surface temperature is higher than the saturation temperature of the liquid. This temperature difference is known as the superheat. It is necessary for the liquid to be superheated in order for nucleate boiling to occur.
(ii) Bubbles are created by the expansion of entrapped gas or vapor at small cavities in the surface:
This statement is correct. Nucleate boiling occurs when small cavities or irregularities on the heated surface act as nucleation sites for bubble formation. These cavities can be microscopic imperfections or roughness on the surface. As the liquid comes into contact with these sites, it rapidly vaporizes and forms bubbles. The expansion of entrapped gas or vapor within these bubbles creates the characteristic boiling effect.
(iii) The temperature is greater than that in film boiling:
This statement is incorrect. In film boiling, which is a more advanced stage of boiling, a thin film of vapor covers the surface and inhibits direct contact between the liquid and the surface. This results in a lower heat transfer rate compared to nucleate boiling. However, in nucleate boiling, the temperature is typically lower than in film boiling due to the rapid vaporization of the liquid at the surface.
(iv) The heat transfer from the surface to the liquid is greater than that in film boiling:
This statement is correct. Nucleate boiling is known for its high heat transfer rates. The formation and collapse of bubbles at the surface enhances convective heat transfer, resulting in efficient heat transfer from the surface to the liquid. In film boiling, on the other hand, the vapor film acts as a thermal insulator and reduces the heat transfer rate.
In conclusion, statements (i), (ii), and (iv) are correct, while statement (iii) is incorrect. Therefore, the correct answer is option B: 1, 2, and 4.
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Consider the following statements regarding nucleate boiling(i) The temperature of the surface is greater than the saturation temperature of the liquid(ii) Bubbles are created by the expansion of entrapped gas oil vapor at small cavities in the surface(iii) The temperature is greater than that in film boiling(iv) The heat transfer from the surface to the liquid is greater than that in the film boilingWhich of these statements are correct?a)1 and 3b)1, 2 and 4c)2, 3 and 4d)1, 2 and 3Correct answer is option 'B'. Can you explain this answer?
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Consider the following statements regarding nucleate boiling(i) The temperature of the surface is greater than the saturation temperature of the liquid(ii) Bubbles are created by the expansion of entrapped gas oil vapor at small cavities in the surface(iii) The temperature is greater than that in film boiling(iv) The heat transfer from the surface to the liquid is greater than that in the film boilingWhich of these statements are correct?a)1 and 3b)1, 2 and 4c)2, 3 and 4d)1, 2 and 3Correct 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 Consider the following statements regarding nucleate boiling(i) The temperature of the surface is greater than the saturation temperature of the liquid(ii) Bubbles are created by the expansion of entrapped gas oil vapor at small cavities in the surface(iii) The temperature is greater than that in film boiling(iv) The heat transfer from the surface to the liquid is greater than that in the film boilingWhich of these statements are correct?a)1 and 3b)1, 2 and 4c)2, 3 and 4d)1, 2 and 3Correct 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 Consider the following statements regarding nucleate boiling(i) The temperature of the surface is greater than the saturation temperature of the liquid(ii) Bubbles are created by the expansion of entrapped gas oil vapor at small cavities in the surface(iii) The temperature is greater than that in film boiling(iv) The heat transfer from the surface to the liquid is greater than that in the film boilingWhich of these statements are correct?a)1 and 3b)1, 2 and 4c)2, 3 and 4d)1, 2 and 3Correct answer is option 'B'. Can you explain this answer?.
Consider the following statements regarding nucleate boiling(i) The temperature of the surface is greater than the saturation temperature of the liquid(ii) Bubbles are created by the expansion of entrapped gas oil vapor at small cavities in the surface(iii) The temperature is greater than that in film boiling(iv) The heat transfer from the surface to the liquid is greater than that in the film boilingWhich of these statements are correct?a)1 and 3b)1, 2 and 4c)2, 3 and 4d)1, 2 and 3Correct 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 Consider the following statements regarding nucleate boiling(i) The temperature of the surface is greater than the saturation temperature of the liquid(ii) Bubbles are created by the expansion of entrapped gas oil vapor at small cavities in the surface(iii) The temperature is greater than that in film boiling(iv) The heat transfer from the surface to the liquid is greater than that in the film boilingWhich of these statements are correct?a)1 and 3b)1, 2 and 4c)2, 3 and 4d)1, 2 and 3Correct 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 Consider the following statements regarding nucleate boiling(i) The temperature of the surface is greater than the saturation temperature of the liquid(ii) Bubbles are created by the expansion of entrapped gas oil vapor at small cavities in the surface(iii) The temperature is greater than that in film boiling(iv) The heat transfer from the surface to the liquid is greater than that in the film boilingWhich of these statements are correct?a)1 and 3b)1, 2 and 4c)2, 3 and 4d)1, 2 and 3Correct answer is option 'B'. Can you explain this answer?.
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