Numerical prediction of air core diameter, coefficient of discharge and spray cone angle of a swirl spray pressure nozzle

✍ Scribed by A. Datta; S.K. Som

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 223 KB
• Volume: 21
• Category: Article
• ISSN: 0142-727X
• DOI: 10.1016/s0142-727x(00)00003-5

✦ Synopsis

Theoretical predictions of air core diameter, coecient of discharge and spray cone angle of a swirl spray pressure nozzle have been made from numerical computations of ¯ow within the nozzle. The diameter of central air core that stabilizes inside the nozzle has been predicted from a hydrodynamic situation that yields the minimum resistance to the liquid ¯ow in the nozzle at given operating conditions. The coecient of discharge and spray cone angle have been evaluated from the distributions of the dierent velocity components of liquid ¯ow at the nozzle ori®ce. It has been observed that the coecient of discharge C d decreases, while the air core diameter d a and spray cone angle w increase with the increase in nozzle ¯ow in its lower range. However, all these parameters C d , d a and w ®nally become independent of nozzle ¯ow. Predicted values of d a , C d and w for dierent geometrical dimensions of the nozzle have been compared with the empirical data available in the literature.