Abstract
A procedure is described for designing thermometer pockets having a good performance in rapidly changing steam conditions. For quick response, the bore diameter and tip wall thickness are minimized while, for safety reasons, the pocket is made conical: a low net error is achieved by choosing dimensions such that the positive and negative errors cancel out. The design theory, which takes account of the effects of fluid temperature gradients (on the assumption of fully developed turbulent flow) is discussed in detail and a practical guide is also given. Although the emphasis is primarily on steam pipes, much of the theory is of interest to the general field of fluid temperature measurement.
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