NASA NTRS · 20080008735
Shell forming system
Abstract
Hollow shells of high uniformity are formed by emitting liquid through an outer nozzle and gas through an inner nozzle, to form a hollow extrusion, by flowing the gas at a velocity between about 1.3 and 10 times the liquid velocity. The natural breakup rate of the extrusion can be increased to decrease shell size by applying periodic perturbations to one of the materials prior to exiting the nozzles, to a nozzle, or to the extrusion.
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Kendall, Jr., James M., Wang, Taylor G., Elleman, Daniel D.. 1990-10-02. Shell forming system. https://ntrs.nasa.gov/citations/20080008735
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