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- W2022348265 abstract "A plate-to-plate thermal precipitation system has been used to investigate the deposition of agglomerate submicrometer soot aerosol particles under flow and temperature conditions relevant for modern heavy-duty diesel engine exhaust gas systems. Over a flow channel length of 45cm, thermophoretic particle deposition efficiencies of 4–95% have been observed as a function of plate distance (0.45–1.45mm), temperature gradient (104–105Km−1), and flow velocity (2–11ms−1). Throughout the investigated particle size range of 34–300nm (electrical mobility diameter), the observed deposition efficiencies are nearly independent of particle size and Knudsen number. The experimental results are in good agreement with theoretical calculations assuming a constant thermophoretic coefficient Kth=0.55 which had been derived by Waldmann and Schmitt (in C. N. Davies (Ed.), Aerosol Science, London, 1966) for the free molecular regime (Kn⪢1). Our results demonstrate that Kth≈0.55 is also applicable for agglomerate soot particles in the transition regime (Kn≈1), which is supported by a recent theoretical study by Rosner and Khalil (J. Aerosol Sci. 31 (2000) 273) on the effect of reduced thermal conductivity on the thermophoretic coefficient of agglomerate particles. To our knowledge, the measurement data presented in this paper provide the first direct experimental validation for the theory of Rosner and Khalil under conditions relevant for diesel engine exhaust gas treatment. Moreover, they confirm the applicability of a simple formula of approximation for the thermophoretic deposition efficiency derived by Tsai and Lu (Aerosol Sci. Technol. 22 (1995) 172)." @default.
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- W2022348265 date "2003-08-01" @default.
- W2022348265 modified "2023-10-07" @default.
- W2022348265 title "Thermophoretic deposition of soot aerosol particles under experimental conditions relevant for modern diesel engine exhaust gas systems" @default.
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- W2022348265 doi "https://doi.org/10.1016/s0021-8502(03)00081-8" @default.
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