60-5 Friday, Jan. 6 14:30 - 14:45 Citrus Jets SMITH, N*; GHOSH, R; DICKERSON, AK; University of Central Florida; University of Central Florida; University of Central Florida firstname.lastname@example.org
The internal rupture of oil glands in the flavedo layer of the citrus exocarp results in catastrophic cellular decay to adjacent cells. However, when peeled, the oil gland cavities can rupture outwardly in response to externally applied bending stresses. Bending of the peel compresses the soft material surrounding the glands, increasing fluid pressure. Ultimately, the fluid pressure exceeds the failure strength of the outmost membrane. The ensuing high-velocity discharge of oil and exhaustive emptying of oil glands creates a novel method to atomize small quantities the aromatic and volatile oils. We employ high-speed videography of gland rupture and bending mechanics simulations of navel and Valencia oranges to rationalize the internal pressures and materials properties contributing to fluid ejection. Particle tracking of oil jetting and rheological measurements of oils reveal jet instability and breakup characteristics critical to droplet formation. Particular attention is given to the evolutionary function and potential applications for this novel method of fluid dispersal.