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- W1982502649 abstract "We compute the joint distribution of relative velocities and separations of identical inertial particles suspended in randomly mixing and turbulent flows. Our results are obtained by matching asymptotic forms of the distribution. The method takes into account spatial clustering of the suspended particles as well as singularities in their motion (so-called 'caustics'). It thus takes proper account of the fractal properties of phase space and the distribution is characterised in terms of the corresponding phase-space fractal dimension D_2. The method clearly exhibits universal aspects of the distribution (independent of the statistical properties of the flow): at small particle separations R and not too large radial relative speeds |V_R|, the distribution of radial relative velocities exhibits a universal power-law form rho(V_R,R) sim |V_R|^{D_2-d-1} provided that D_2 < d+1 (d is the spatial dimension) and that the Stokes number St is large enough for caustics to form. The range in V_R over which this power law is valid depends on R, on the Stokes number, and upon the nature of the flow. Our results are in good agreement with results of computer simulations of the dynamics of particles suspended in random velocity fields with finite correlation times. In the white-noise limit the results are consistent with those of [Gustavsson and Mehlig, Phys. Rev. E84 (2011) 045304]." @default.
- W1982502649 created "2016-06-24" @default.
- W1982502649 creator A5074141887 @default.
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- W1982502649 date "2014-01-02" @default.
- W1982502649 modified "2023-09-23" @default.
- W1982502649 title "Relative velocities of inertial particles in turbulent aerosols" @default.
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- W1982502649 doi "https://doi.org/10.1080/14685248.2013.875188" @default.
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