SHOCK-FREE BREAKUP OF DROPLETS. TEMPORAL CHARACTERISTICS

B. Gel'Fand, (1) , Bruno Vieille (2) , Iskender Gökalp (2) , Christian Chauveau (2)

1 N. N. Semenov Institute of Chemical Physics
2 LCSR - Laboratoire de combustion et systèmes reactifs

In the present paper, we consider the shock-free breakup of droplets in their encounter with alayer(sheet)of a moving gas in the absence of pressure perturbations when the droplets areaffected by a short U-shaped pulse of aerodynamic forces. Under a high pressure of the ambientgas mediump0= 20–80bar, the droplets(ethanol or liquid oxygen) have a chance to break upafter stay in a thing(2–5mm thick) gas layer(jet) moving with a velocity of 1–10 m/sec. A distinctive feature of the process is that the characteristic time of droplet deformation and the period of natural oscillations coincide with the residence time for the droplets in the region of their interaction with the gas stream. Empirical formulas are proposed for determination of the total breakup time and the duration of the droplet disintegration stage in shock-free breakup.

Domaines: Milieux fluides et réactifs

B. Gel'Fand,, Bruno Vieille, Iskender Gökalp, Christian Chauveau. SHOCK-FREE BREAKUP OF DROPLETS. TEMPORAL CHARACTERISTICS. Journal of Applied Mechanics and Technical Physics, 2000, 42 (1), pp.63 - 66. ⟨10.1023/A:1018804527327⟩. ⟨hal-01859723⟩