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- Title
A CFD study of gas and particle motion in an aerosol generator operated by desublimation process.
- Authors
Urazmetov, Oleg; Kerner, Maximilian; Dillenburger, Tim; Misiulia, Dzmitry; Antonyuk, Sergiy
- Abstract
[Display omitted] • Development of an aerosol generator for generation of particles with different structures by desublimation. • CFD revealed a toroidal backflow in the expansion chamber behind the Laval nozzle. • Estimation of supersaturation of CuPc in an aerosol generator by a custom field function using CFD. • Core particles introduced into supersaturation zone by backflow lead to heterogeneous desublimation. • Heterogeneous desublimation of CuPc on TiO 2 cores and homogeneous desublimation of CuPc are obtained. In this work, a novel aerosol generator for submicron particles with a core-shell structure is presented. The operation process starts with the sublimation by heat of an organic material, copper phthalocyanine (CuPc), to form an under saturated gas flow. Then, the adiabatic expansion through a Laval nozzle is used to form a supersaturated free jet. Finally, by employing an active cooling and the injection of titanium dioxide (TiO 2) core particles, on the free jet side, the aerosol formation is enabled by the desublimation process. The Euler–Lagrange CFD simulations of the gas and particle flow revealed the rotating backflow of the core particles inside the cooled expansion chamber. Hence, the core particles are transported into the conical free jet region emerging from the Laval nozzle where the highest supersaturation of CuPc occurs. In addition to the numerical simulations, the resulting structure and size of the generated particles were experimentally investigated by employing scanning mobility particle sizer and a scanning electron microscope analysis. The surface of modified TiO 2 core particles showed a punctual coating with desublimated CuPc.
- Subjects
LAVAL (Quebec); PARTICLE motion; AEROSOLS; SCANNING electron microscopes; GRANULAR flow; GAS flow; COPPER phthalocyanine
- Publication
Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A, 2021, Vol 169, p229
- ISSN
0263-8762
- Publication type
Article
- DOI
10.1016/j.cherd.2021.03.022