Abstract
When a small sphere is passing through an oil-water interface without dewetting, an oil film will be coated on the sphere's surface. Here a nominal Bond number is defined to classify different behaviors of the sphere crossing the oil-water interface with an initial velocity of zero, according to the radius of the spheres and the density difference between the spheres and the liquid. The critical value of the nominal Bond number for the small sphere to pass through the interface is derived to be 1.5, and the thickness of the coating film on the spheres can be well-predicted when the nominal Bond number is in the range of 1.5–7.5. It is demonstrated that this predictable coating film can be used as a potential coating technology to form thick and even coating film on small spheres.
- Received 3 June 2018
DOI:https://doi.org/10.1103/PhysRevFluids.3.124003
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