The mechanism of sheat formation by plunging jets

✍ Scribed by D.G.C. Robertson; D.P. O'shaughnessy; N.A. Molloy

• Publisher: Elsevier Science
• Year: 1973
• Tongue: English
• Weight: 494 KB
• Volume: 28
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(73)80105-8

✦ Synopsis

SEVERAL investigators [ l-31 have observed the formation of a sheath surrounding a liquid jet plunging into a liquid pool. This behaviour occurs only where jet viscosity is > 5 c.p. but is independent of the viscosity of the liquid pool. Jets of lower viscosity break down below an induction trumpet in the liquid surface.

cities were varied from l-7 mlsec and ambient pressure down to 0.5 mm Hg. The jet diameter was 1.52 mm. Figure 1 illustrates the effect of ambient pressure on sheath formation. At a pressure of 1 mm Hg an induction trumpet was formed but no sheath.

Shorter Communications jet leaves the ambient atmosphere and enters the sheath Department of Metallurgy D. G. C. ROBERTSON (Fig. 3) and this will induce Taylor instability in the low Imperial College D. P. O'SHAUGHNESSY viscosity jets. London SW7 2BP N. A. MOLLOW We conclude by stating that our experimental observations England show that the formation of the sheath is dependent on the ambient pressure having a sufficiently high value and that the Guthrie and Bradshaw model offers a feasible explana-tPresent address: