Numerical study on film disintegration by centrifugal atomisation using rotating cup

Abstract

Centrifugal atomisation of liquid or melts using a rotating cup is an efficient process that is widely used in many industrial processes, which range from chemical reactors to powder production in metallurgy. The theoretical prediction of liquid drop or particle size is desirable for the design of atomisers and operating parameters. In this paper, film disintegration by centrifugal atomisation using a rotating cup was analysed based on wave theory. Two mathematical models were proposed to predict the maximum unstable growth rate, wave length, film length, break-up time and drop size for the rotating cup at high and low Weber number respectively. The film break-up length and drop size were calculated numerically and agreed with the experimental results very well in film disintegration. In addition, the effects of the atomisation parameters in the film disintegration were discussed. The mathematical models are able to accurately predict the atomisation parameters.

Keywords

Drop Particle formation Numerical simulation Rotating cup Centrifugal atomisation

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References

Hinze

J. O.

and Milborn

H. J.

‘Atomization of liquids by means of a rotating cup’, J. Appl. Mech., 1950, 17, 145–53.

Labrecque

, Angers

, Tremblay

and Dube

‘Inverted disk centrifugal atomization of AZ91 magnesium alloy’, Can. Metall. Q., 1997, 36, 169–75.

Dogan

and Saritas

‘Metal powder production by centrifugal atomization’, Int. J. Powder Metall., 1997, 30, 419–427.

Matsumoto

, Saito

and Takashima

‘Phenomenal transition of liquid atomization from disk’, J. Chem. Eng. Jpn, 1974, 7, 13–19.

Liu

J. X.

, Yu

Q. B.

and Guo

‘Experimental investigation of liquid disintegration by rotary cups’, Chem. Eng. Sci., 2012, 73, 44–50.

Dixon

B. E.

, Russell

A. A. W.

and Swallow

J. E. L.

‘Liquid films formed by means of rotating disks’, Br. J. Appl. Phys., 1952, 3, 115–119.

Dombrowski

and Fraser

R. P. A.

‘Photographic investigation into the disintegration of liquid sheets’, Philos. Trans. R. Soc. Lond. A, 1954, 247A, 101–130.

Matsumoto

, Ohara

, Teruya

and Ohashiy

‘Liquid film formation on a rotating disk (numerical analysis at the initial stage)’, JSME Int. J., 1989, 32, 52–56.

Bruin

‘Velocity distribution in a liquid film flowing over a rotating conical surface’, Chem. Eng. Sci., 1969, 24, 1647–1654.

10.

Emslie

A. G.

, Bonner

F. T.

and Peck

L. G.

‘Flow of a viscous liquid on a rotating disk’, J. Appl. Phys., 1958, 29, 858–862.

11.

Fraser

R. P.

, Dombrowski

and Routley

J. H.

‘The filming of liquids by spinning cups’, Chem. Eng. Sci., 1963, 18, 323–337.

12.

Kamiya

and Kayano

‘Film-type disintegration by rotating disk’, J. Chem. Eng. Jpn, 1972, 5, 174–82.

13.

Xie

J. W.

, Zhao

Y. Y.

and Dunkley

J. J.

‘Effects of processing conditions on powder particle size and morphology in centrifugal atomisation of tin’, Powder. Metall., 2004, 47, 168–172.

14.

Zhao

Y. Y.

‘Analysis of flow development in centrifugal atomization: Part I. Film thickness of a fully spreading melt’, Modell. Simul. Mater. Sci. Eng., 2004, 12, 959–971.

15.

Rutland

D. F.

and Jameson

G. J.

‘Droplet production by the disintegration of rotating liquid jets’, Chem. Eng. Sci., 1970, 25, 1301–1317.

16.

Kamiya

‘An analysis of the ligament-type disintegration of thin liquid film at the edge of rotating disk’, J. Chem. Eng. Jpn, 1972, 5, 391–396.

17.

H. P.

and Deng

X. C.

‘Prediction of powder particle size during centrifugal atomization using a rotating disk’, Sci. Technol. Adv. Mater., 2007, 8, 264–270.

18.

Weber

‘Disintegration of liquid jets’, Z. Angew. Math. Me., 1931, 11, 136–139.

19.

Dombrowski

and Johns

W. R.

‘The aerodynamic instability and disintegration of viscous liquid sheets’, Chem. Eng. Sci., 1963, 18, 203–214.

20.

Clark

C. J.

and Dombrowski

‘Aerodynamic instability and disintegration of inviscid liquid sheets’, Proc. R. Soc. Lond. A, 1972, 329A, 467–478.

21.

Senecal

P. K.

, Schmidt

D. P.

, Nouar

, Rutland

C. J.

and Reitz

R. D.

‘Modeling high-speed viscous liquid sheet atomization’, Int. J. Multiphase Flow, 1999, 25, 1073–1097.

22.

Deng

and Ouyang

‘Vibration of spinning discs and powder formation in centrifugal atomization’, Proc. R. Soc. Lond. A, 2010, 467A, 361–80.

23.

Rayleigh

‘On the instability of jets’, Proc. R. Soc. Lond. A, 1878, S1–S10A, 4–13.