The Steam Injector
A theoretical and practical treatise on the design and operation of injectors and on the flow of fluids through and the design of nozzles.

46 THE STEAM INJECTOR. to 60 deg., and it is important to note that a sudden enlarge- ment of section is more efficient in the conversion of kinetic into pressure energy than a gradual enlargement in whicli the angle 0 is greater than this critical valne. (b) In pipes of square section the loss is a minimum when 6 is approximately 6 deg., and attains a value of 100 per cent when 6 is between 25 deg. and 30 deg. (c) In rectangular passages having one pair of aides parallel, the loss is a minimum when 6 is approximately 11 deg. It varies little wich the size of passage and with the ratio of enlargement, and is given with fair accuraey, for values of 0 between 10 deg. and 35 deg., by the relation- ship— Losa = 0-0072 Ø1’4 feet. 2 <7 The maximum loss is obtained when 0 is about 70 deg.; while the critical value of 0, above which the loss is greater than at a sudden enlargement of section, varies from 32 deg. to 40 deg.”