Open AccessOn the coefficient of heat transfer from the internal surface of tube walls
Author(s) -
Albert Eagle,
R. Matthew Ferguson
Publication year - 1930
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1930.0076
Subject(s) - condenser (optics) , thermocouple , tube (container) , heat transfer coefficient , mechanics , heat transfer , thermodynamics , work (physics) , shell and tube heat exchanger , materials science , mechanical engineering , composite material , engineering , physics , optics , light source
The present work on the transfer of heat from a heated brass tube to water flowing through it was undertaken for the British Electrical and Allied Industries Research Association though the experimental methods pursued were left to the discretion of the experimenters. Two important innovations compared with the methods of previous experimenters were: First, the direct heating of the tube by a low tension alternating current; and secondly, the discarding of the use of thermocouples to obtain the temperature of the water, this being calculated for any cross-section from the amount of heat put into the water up to that cross-section. The temperature so calculated is what an engineer always understands as the temperature of the water. The only other way of getting a definite water temperature is to take the temperature at points in the axis—a quite unimportant temperature in practice. Naturally the value that is obtained for the coefficient of heat transfer depends considerably on what is taken as the water temperature. 2.Historical . Many experiments on the transfer of heat across condenser tubes have been made with the outside of the tube steam heated, the amount of heat transfer being obtained from the rise of temperature of the water flowing through the tube. None of this work has any scientific value, however, except in the few cases where the actual temperature of the tube was directly obtained by means of thermocouples. Here are included the experiments of Webster, Clement and Garland and McAdams and Frost. Also worthy of mention are some early experiments by Stanton in which the temperature of the tube was obtained from its increase in length.