Q. The bubble diameter at the time of detachment from the surface can be worked out from the relation proposed by

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Q. The nucleate pool boiling is influenced by the following factors
(i) Pressure
(ii) Liquid properties
(iii) Material
Identify the correct statements

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Q. Consider the following phenomena
(i) Boiling
(ii) Free convection in air
(iii) Forced convection in air
(iv) Conduction in air
Identify the correct sequence (heat transfer coefficient)

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Q. The bubble diameter at the time of detachment from the surface can be worked out from the relation proposed by Fritz and is given by
(Where, β is the angle of contact)

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Q. In spite of large heat transfer coefficient in boiling liquids, fins are used advantageously when the entire surface is exposed to

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Q. With increase in excess temperature, the heat flux in boiling

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Q. The excess temperature range 50 degree Celsius < d t < 200 degree Celsius is indicative of the region of

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Q. Heat flux increases with temperature excess beyond the Leiden-frost point due to

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Q. Leiden-frost expansion is related to

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Q. 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?

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Q. Consider an elemental control volume for mass balance continuity equation. Which one of the following is correct?

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