Abstract
The theory of thermometer pocket errors previously developed by the author has been tested by experiment using steam flows under steady-state conditions. When an appreciable temperature difference exists between steam and pipe wall, whatever the reason, errors arise from the temperature gradient in the steam and the loss of heat by conduction and radiation from the pocket. The results confirmed that the net error is a linear proportion of the steam/pipe wall temperature difference and can be substantial if the pocket is not of a suitable length. The effect of plating the pockets with rhodium was not as expected since the accompanying reduction in radiation error was offset by a larger increase in conduction error. In all other cases, the measured conduction plus radiation errors were in good agreement with the theory, while the effects of the steam temperature profile were also broadly as predicted. The basic theoretical approach was satisfactorily confirmed and the accuracy shown to be better than 5 per cent of the steam/pipe wall temperature difference.
Published Version
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