Film/sheet regime

For the transition from Ligament to Film/Sheet Formation regime or the reverse transition, the equation of Hinze and MilbornJ112 QX = 0.340 Re2/3/We° 883, may be used to predict the dimensionless transition flow rate for liquids of low viscosities (less than a few poises). For more viscous liquids, the equation derived by Tanasawa et al.,[48°l QX = 0.297 Re6/5/We, is applicable for the calculation of the dimensionless transition flow rate. 

Figure 4.3. Regimes in centrifugal atomization of melts Direct Droplet Formation, Ligament Disintegration, and Film/Sheet Disintegration.

Figure 3.9. Regimes in rotary (centrifugal) atomization of liquids (a) Direct Droplet Formation, (b) Direct Droplet and Ligament Formation, (c) Ligament Formation, and (d) Film or Sheet Formation.

In a total wetting regime S > 0), a film is always stable. By contrast, when 5 < 0, a film will dewet below a critical thickness Cc, as can be observed in a Teflon pan or on a plastic sheet. When you place a small drop of water on one of these materials, it will contract into a spherical cap. When you place a larger drop, it will form a puddle flattened by gravity. If you use... 

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