Investigation of the effect of nozzle shape on supersonic/hypersonic impactors designed for size discrimination of nanoparticles |
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| Institution: | 1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, China;2. University of Chinese Academy of Sciences (UCAS), Beijing 100049, China;1. Department of Mechanical and Aerospace Engineering, Rutgers University, Piscataway, New Jersey 08854, United States;2. Department of Thermal Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | In this study the flow field and the nanoparticle collection efficiency of supersonic/hypersonic impactors with different nozzle shapes were studied using a computational modeling approach. The aim of this study was to develop a nozzle design for supersonic/hypersonic impactors with the smallest possible cut-off size d50 and rather sharp collection efficiency curves. The simulation results show that the changes in the angle and width of a converging nozzle do not alter the cut-off size of the impactor; however, using a conical Laval nozzle with an L/Dn ratio less than or equal to 2 reduced d50. The effect of using a cap as a focuser in the nozzle of a supersonic/hypersonic impactor was also investigated. The results show that adding a cap in front of the nozzle had a noticeable effect on decreasing the cut-off size of the impactor. Both flat disks and conical caps were examined, and it was observed that the nozzle with the conical cap had a lower cut-off size. |
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| Keywords: | Supersonic/hypersonic Impactor Nanoparticle Nozzle |
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