Abstract
Abstract After discussing the disagreement existing in viscosity data for superheated steam as reported by recent investigators, the authors report the results of a new determination of viscosity. A nickel capillary 103.2 ft long was used in this investigation. The differential head across the capillary was determined by radiographing the mercury levels in a steel-tube manometer. Data are reported for 60 calibration tests and for 61 tests on steam at pressures up to 1810 lb per sq in. abs and 1000 F. All of the tests were run under steady-flow conditions for a minimum period of 1 hr. Plank’s equation has been modified to express the results over the entire range of pressures and temperatures covered by this investigation. As a result of additional calibration tests made to determine the effect of curvature on the capillary constant, the results given in this paper supersede those presented at the Annual Meeting of the Society.
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