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Theoretical and experimental study of an axial flow cyclone for fine particle removal in vacuum conditions

Theoretical and experimental study of an axial flow cyclone for fine particle removal in vacuum conditions,10.1016/j.jaerosci.2004.03.007,Journal of A

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Theoretical and experimental study of an axial flow cyclone for fine particle removal in vacuum conditions   (Citations: 7)
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An axial flow cyclone to remove fine particles at low pressure conditions (6–23torr) was designed and tested. The inner diameter of the cyclone is 3.0cm and tested flow rates are 0.455 and 1.0slpm. A theoretical evaluation was first carried out to calculate the particle collection efficiency and cutoff diameter for the axial flow cyclone. Experiments were then conducted to test the theory at different flow rates, pressures and cyclone designs. It was demonstrated that at sufficiently low pressure of 6torr (flow rate=0.455slpm), the axial flow cyclone is able to remove particles below 100nm efficiently, and the flow Reynolds number was found to have a great effect on the particle collection efficiency.
Journal: Journal of Aerosol Science - J AEROSOL SCI , vol. 35, no. 9, pp. 1105-1118, 2004
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    • ...For removing nanoparticles by cyclones, Tsai et al. (2004) first investigated the performance of the axial flow cyclone under low pressure conditions...

    Ta-Chih Hsiao, et al. Development of a MultiStage Axial Flow Cyclone

    • ...In this study, the axial flow cyclone used in Tsai et al. (2004) was further tested for the collection efficiency of both solid (NaCl) and liquid (OA, oleic acid) nanoparticles...
    • ...Making use of large slip correction factor of nanoparticles at reduced pressure, Tsai et al. (2004) designed and tested an axial flow cyclone to remove nanoparticles smaller than 100 nm at low pressure conditions...
    • ...Tsai et al. (2004) derived a theoretical equation for the particle collection efficiency based on the air...
    • ...Hsu et al. (2005) derived a model considering both centrifugal and diffusional forces for nanoparticle removal in vacuum using the axial flow cyclone of Tsai et al. (2004)...
    • ...In this study, NaCl and OA monodisperse nanoparticles in diameter from 12 to 100 nm were generated to test the axial flow cyclone of Tsai et al. (2004)...
    • ...For the detailed procedure, refer to Tsai et al. (2004)...
    • ...The collection efficiencies of solid NaCl and liquid OA particles for the inlet pressure of 6 and 5.4 Torr and the sampling flow rate of 0.455 lpm are compared in Figure 3. For OA particles, the present experimental data are in good agreement with Tsai et al. (2004)...
    • ...This is one of the main reasons why the differences are large between the experimental cutoff aerodynamic diameters and the theoretical values in Tsai et al. (2004) in which...
    • ...The tangential velocity peaks near the center of the plane in both figures and the value is about two times the average tangential velocity, which was given in Tsai et al. (2004) as...
    • ...The following section describes a modified empirical method from Tsai et al. (2004), which can be used to predict the cutoff aerodynamic based on the inlet pressure, flow rate, and cyclone dimension...
    • ...In this study, the theoretical derivation of the particle collection efficiency is similar to our previous study (Tsai et al., 2004) but the pressure drop through the vane section is assumed to be linear...
    • ...Referring to Tsai et al. (2004), the slip correction factor used to calculate the particle relaxation time (see Eq. (4)) is given as...
    • ...In this study, the axial flow cyclone of Tsai et al. (2004) was further tested for the collection efficiencies of solid NaCl and liquid OA nanoparticles in the diameter from 12 to 100 nm at low-pressure conditions (4.3, 5.4, 6.0, 6.8, and 7.0 Torrs)...
    • ...Based on the simulated pressure and tangential flow fields, a modified theoretical method from Tsai et al. (2004) was proposed...

    Sheng-Chieh Chen, et al. An axial flow cyclone to remove nanoparticles at low pressure conditio...

    • ...In this study, the axial flow cyclone used in Tsai et al. (2004) was further tested for the collection efficiency of both solid (NaCl) and liquid (OA, oleic acid) nanoparticles...
    • ...Making use of large slip correction factor of nanoparticles at reduced pressure, Tsai et al. (2004) designed and tested an axial flow cyclone to remove nanoparticles smaller than 100 nm at low pressure conditions...
    • ...Tsai et al. (2004) derived a theoretical equation for the particle collection efficiency based on the air...
    • ...Hsu et al. (2005) derived a model considering both centrifugal and diffusional forces for nanoparticle removal in vacuum using the axial flow cyclone of Tsai et al. (2004)...
    • ...In this study, NaCl and OA monodisperse nanoparticles in diameter from 12 to 100 nm were generated to test the axial flow cyclone of Tsai et al. (2004)...
    • ...For the detailed procedure, refer to Tsai et al. (2004)...
    • ...The collection efficiencies of solid NaCl and liquid OA particles for the inlet pressure of 6 and 5.4 Torr and the sampling flow rate of 0.455 lpm are compared in Figure 3. For OA particles, the present experimental data are in good agreement with Tsai et al. (2004)...
    • ...This is one of the main reasons why the differences are large between the experimental cutoff aerodynamic diameters and the theoretical values in Tsai et al. (2004) in which...
    • ...The tangential velocity peaks near the center of the plane in both figures and the value is about two times the average tangential velocity, which was given in Tsai et al. (2004) as...
    • ...The following section describes a modified empirical method from Tsai et al. (2004), which can be used to predict the cutoff aerodynamic based on the inlet pressure, flow rate, and cyclone dimension...
    • ...In this study, the theoretical derivation of the particle collection efficiency is similar to our previous study (Tsai et al., 2004) but the pressure drop through the vane section is assumed to be linear...
    • ...Referring to Tsai et al. (2004), the slip correction factor used to calculate the particle relaxation time (see Eq. (4)) is given as...
    • ...In this study, the axial flow cyclone of Tsai et al. (2004) was further tested for the collection efficiencies of solid NaCl and liquid OA nanoparticles in the diameter from 12 to 100 nm at low-pressure conditions (4.3, 5.4, 6.0, 6.8, and 7.0 Torrs)...
    • ...Based on the simulated pressure and tangential flow fields, a modified theoretical method from Tsai et al. (2004) was proposed...

    Sheng-Chieh Chen, et al. An axial flow cyclone to remove nanoparticles at low pressure conditio...

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