. A text book of physics, for the use of students of science and engineering . m be the mass ofwater per second delivered by the jet, then Energy supplied per sec. mv-, In practice from 70 to 90 per cent, of thisappears as useful work done on the wheel. Centrifugal pumps.—Water may be raisedfrom a lower to a higher level by means of acentrifugal pump. In Fig. 319 the water in Aflows up a vertical pipe, and reaches a wheelB where additional kinetic energy is impartedto it. The wheel is driven by some sourceof power and whirls the water, giving it ahigher speed. This speed is reduced graduallyin
. A text book of physics, for the use of students of science and engineering . m be the mass ofwater per second delivered by the jet, then Energy supplied per sec. mv-, In practice from 70 to 90 per cent, of thisappears as useful work done on the wheel. Centrifugal pumps.—Water may be raisedfrom a lower to a higher level by means of acentrifugal pump. In Fig. 319 the water in Aflows up a vertical pipe, and reaches a wheelB where additional kinetic energy is impartedto it. The wheel is driven by some sourceof power and whirls the water, giving it ahigher speed. This speed is reduced graduallyin the casing which surrounds the wheel, andhence the kinetic energy added by the actionof the wheel is converted into pressure energyin the discharge pipe at C. The resultingpressure is sufficient to overcome the headof water in the pipe CD, hence flow is main-tained upwards, and the pressure energy isconverted finally into potential energy in the upper tank E. If His the difference in free surface levels, then gH units of useful workhave been done per unit mass of Fig. 319.—Arrangement ofa centrifugal pump. Exercises on Chapter XXI. 1. Describe what is meant by steady and unsteady motion in what is meant by a stream line. 2. Describe briefly Osborne Reynoldss colour band experiment. Whatis meant by the critical velocity ? 206 DYNAMICS CHAP.
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