May 2018
Intermediate to advanced
1160 pages
30h 12m
English
Content preview from Thermal Engineering
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Chapter 6
Flow Through Steam Nozzles
6.1 ❐ INTRODUCTION
The steam nozzle is a passage of varying cross-section by means of which a part of the enthalpy of steam is converted into kinetic energy as the steam expands from a higher pressure to a lower pressure. Therefore, a nozzle is a device designed to increase the velocity of steam. Steam nozzles are of three types, namely convergent nozzle, divergent nozzle, and convergent–divergent nozzle. If the cross-section of the nozzle decreases continuously from the entrance to exit, then it is called a convergent nozzle, as shown in Fig. 6.1(a). If the cross-section increases, then it is called a divergent nozzle, as shown in Fig. 6.1(b). If the cross-section of the nozzle first decreases and then increases, ...
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