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18. The mechanism of boiling

Author

Dubey, Ram Surat

Subjects
621.402
Abstract

Boiling has been found to depend largely upon the presence of foreign agents called ebullators, which appear to aid boiling (1) by supplying bubble nuclei in the form of adsorbed gas, and/or, (2) by creating cavities on the heat transfer surface, in which the liquid undergoes local superheating. Presence of adsorbed gas or vapour seems to be the most probable reason for nucleus bubble formation without abnormal superheating. The nature of boiling of water, ethyl alcohol, & toluene, has been observed in a glass-tube, vertical, natural-circulation, evaporator, and coefficients for the boiling section reported. The fluid column can in general be divided into boiling and non-boiling sections. Working on this basis, overall and film coefficients for the boiling section are reported for water under natural circulation in a stainless steel tube, and for water, ethyl alcohol and toluene in a copper tube under natural-circula-tion. The coefficients for the boiling film for water are the highest and of the same order as those obtained by previous investigators. The same three liquids have been studied under forced-circulation in the copper-tube. The coefficients obtained are generally lower than before. Boiling has also been studied on electrically heated wires of three different diameters with water and ethyl alcohol at their boiling points, under forced-circulation at three different velocities. Forced-circulation increases heat transfer in the natural convection region, and in the boiling region for low values of temperature drop.

Published
1950

21. Powerlessness Among Disadvantaged Blacks

Author

Dubey, Sumati N. and Grant, Morris L.

Abstract

Recent studies show that powerlessness is an important variable in predicting behavioral and attitudinal patterns, and is related to environmental factors. (DM)

Published
1970

29. THE ELEVENTH INDIAN POLITICAL SCIENCE CONFERENCE: held at Nagpur from the 7th to the 9th January, 1949

Author

ROHATGI, B. N., Puntambekar, S. V., Ram, V. S., Sharma, Indra Datt, Mukerji, K. P., Majumdar, Bimanbehari, Rao, T. S. Narayan, Rao, M. V. Krishna, Kogekar, S. V., Sharma, Bodhraj, Dubey, S. C., Sharma, J. C., Rao, A. Papa, Panda, A. C., Oza, U. K., Singh, Sushil Chandra, Argal, R., Masaldan, P. N., Panda, Mrutyunjoy, Srivastava, Gur Prasad, Misra, B., Jha, Chetkar, Bhidey, G. T., and Dube, S. C.

Published
1949

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