Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816.
Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816
Proc Natl Acad Sci U S A. 2018 Jun 26;115(26):E5887-E5895. doi: 10.1073/pnas.1720809115. Epub 2018 Jun 11.
The rupture of oil gland reservoirs housed near the outer surface of the citrus exocarp is a common experience to the discerning citrus consumer and bartenders the world over. These reservoirs often rupture outwardly in response to bending the peel, which compresses the soft material surrounding the reservoirs, the albedo, increasing fluid pressure in the reservoir. Ultimately, fluid pressure exceeds the failure strength of the outermost membrane, the flavedo. The ensuing high-velocity discharge of oil and exhaustive emptying of oil gland reservoirs creates a method for jetting small quantities of the aromatic oil. We compare this jetting behavior across five citrus hybrids through high-speed videography. The jetting oil undergoes an extreme acceleration to reach velocities in excess of 10 m/s. Through material characterization and finite element simulations, we rationalize the combination of tuned material properties and geometries enabling the internal reservoir pressures that produce explosive dispersal, finding the composite structure of the citrus peel is critical for microjet production.
油腺储器位于柑橘外果皮的外表面附近，破裂是有经验的柑橘消费者和世界各地调酒师的常见体验。这些储器通常会因果皮弯曲而向外破裂，这会压缩围绕储器的柔软材料，即桔白，从而增加储器中的流体压力。最终，流体压力超过最外层膜（桔皮）的失效强度。随之而来的是油的高速排放和油腺储器的排空，从而产生喷射少量芳香油的方法。我们通过高速录像比较了五种柑橘杂种的喷射行为。喷射油经历了极端加速，达到超过 10 m/s 的速度。通过材料特性和有限元模拟，我们合理化了调整材料特性和几何形状的组合，从而产生了产生爆炸分散的内部储器压力，发现柑橘皮的复合材料结构对于微喷射生产至关重要。
