The Mechanism of Boiling

Dubey, Ram Surat (1950) The Mechanism of Boiling. PhD thesis, University of Glasgow.

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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. Above about 25

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Keywords: Chemical engineering, Thermodynamics
Date of Award: 1950
Depositing User: Enlighten Team
Unique ID: glathesis:1950-79812
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 31 Mar 2020 09:09
Last Modified: 31 Mar 2020 09:09

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