A novel
experiment is
designed to visually study the interphase mass transfer in an immiscible
liquid–liquid system using the planar laser-induced fluorescence
method combined with the refractive index matching technique. Rhodamine
B is chosen as the fluorescence tracer because it can dissolve in
both aqueous and organic phases. The experimental results indicate
that the mass transfer equilibrium time is negatively correlated to
the agitation speed. For the Rushton disk turbine, the interphase
mass transfer efficiency is enhanced as the impeller clearance increases
from T/10 to 2T/5. Furthermore,
the interphase mass transfer process is dampened and the equilibrium
time increases continuously when the volume fraction of NaI solution
increases from 2 to 50%. When the impeller eccentricity increases,
the mass transfer equilibrium time increases correspondingly and the
trend of its change in the immiscible liquid–liquid system
is contrary to that of mixing time in the single phase.
In this article, Bi2O3/Al high-density energetic composites with a core-shell structure were prepared by a two-step ball milling method using a common planetary ball milling instrument, and their morphology, structure, and properties were characterized in detail. Through a reasonable ratio design and optimization of the ball milling conditions, the density of the Bi2O3/Al core-shell energetic composite is increased by about 11.3% compared to that of the physical mixed sample under the same conditions. The DSC (Differential Scanning Calorimetry) test also showed that the exothermic quantity of the thermite reaction of the energetic composite reached 2112.21 J/g, which is very close to the theoretical exothermic quantity. The effect of Bi2O3/Al core-shell energetic composite on the energy performance of insensitive HTPE propellant was further studied. The theoretical calculation results showed that replacing the partial Al with Bi2O3/Al core-shell energetic composite can make the density of propellant reach 2.056 g/cm3, and the density specific impulse reach 502.3 s·g/cm3, which is significantly higher than the density and density specific impulse of the conventional composite solid propellant. The thermal test showed that the explosive heat of the HTPE (Hydroxyl terminated polyether) propellant also increased with the increase of the content of Bi2O3/Al core-shell energetic composite.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.