Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . ? 100 Fig. 126.—Stodolas explorationcurves for nozzles. Fig. 127.—Stodolas explorationcurves for orifices. the centrifugal force exerting the necessary radial pressure toallow the steam to have an acceleration axially. This cen-trifugal force is only another way of expressing the inertia of thesteam against radial acceleration. If a valve is put in the pipe line beyond the nozzle, the pres-sure of the discharge region may be raised, and the curve foundby the exploring tube shows what
Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . ? 100 Fig. 126.—Stodolas explorationcurves for nozzles. Fig. 127.—Stodolas explorationcurves for orifices. the centrifugal force exerting the necessary radial pressure toallow the steam to have an acceleration axially. This cen-trifugal force is only another way of expressing the inertia of thesteam against radial acceleration. If a valve is put in the pipe line beyond the nozzle, the pres-sure of the discharge region may be raised, and the curve foundby the exploring tube shows what may happen in over expan-sion. Curves obtained by Stodola are shown in Fig. 126. The waves set up at low pressures are due probably to acous-tic vibrations which are so dampened by friction as to be elimi-nated in a short time. This is due to the fact that the velocity at 272 HEAT ENGINEERING the critical pressure of the throat corresponds to the velocity ofsound. This velocity of course depends on the pressure and tem-perature of the substance. Stodola points out that this is anillustration of Riemanns The
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