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• W1978214997 abstract "Belyaev and Levin (Journal of Aerosol Science, 5 (1974) 325) (B& L) empirically derived a function for aspiration efficiencies A of thin-walled inlets operated at low velocity ratios U/U0 (U flow velocity inside the inlet, U0 velocity of the free flow). This function, which is especially applicable for particle sampling on fast, high-altitude aircraft, has not been experimentally or theoretically verified. By means of the computational fluid dynamics model (CFX), we evaluate this B&L function by explicitly determining inlet aspiration efficiencies over a wide range of high-altitude airborne applications. We find good agreement in the range where B&L performed their measurements (U/U0=0.18–0.2, particle Stokes numbers Stk>0.1), but for lower U/U0 and smaller Stk the B&L function deviates from the CFX results. Therefore, we provide here a modified B&L function covering the ranges U/U0=0.007–0.2 and Stk>0.001:A(Stk)=(aStk+b)(aStk+1+b)U0U+cUU0a=1.26,b=0.27,c=0.50,(a)UU0<0.2,(b)Stk>0.001.In addition, we used CFX to analyze the performance of a short inlet and demonstrate the strong sensitivity of the sampling characteristics to the inlet design, i.e. the particle transmission efficiency changes from zero for a standard inlet to 30% for a short inlet and the aspiration efficiencies of smaller particles are lower by approximately a factor of two when sampled with the short in comparison to the standard inlet." @default.
• W1978214997 created "2016-06-24" @default.
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• W1978214997 date "2004-06-01" @default.
• W1978214997 modified "2023-10-14" @default.
• W1978214997 title "Sampling characteristics of inlets operated at low U/U0 ratios: new insights from computational fluid dynamics (CFX) modeling" @default.
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• W1978214997 doi "https://doi.org/10.1016/j.jaerosci.2003.11.011" @default.
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