Test: Bubble Growth - Mechanical Engineering MCQ

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

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

With increase in excess temperature, the heat flux in boiling

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

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

Leiden-frost expansion is related to

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?