Turbulence, raindrops and the l1/2 number density law

Details Turbulence, raindrops and the l1/2 number density law Turbulence, raindrops and the l1/2 number density law

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008njph...10g5017l&link_type=abstract

New Journal of Physics, Volume 10, Issue 7, pp. 075017 (2008).

Physics

8

Scientific paper

Using a unique data set of three-dimensional drop positions and masses (the HYDROP experiment), we show that the distribution of liquid water in rain displays a sharp transition between large scales which follow a passive scalar-like Corrsin Obukhov (k-5/3) spectrum and a small-scale statistically homogeneous white noise regime. We argue that the transition scale lc is the critical scale where the mean Stokes number (= drop inertial time/turbulent eddy time) Stl is unity. For five storms, we found lc in the range 45 75 cm with the corresponding dissipation scale Stη in the range 200 300. Since the mean interdrop distance was significantly smaller (≈ 10 cm) than lc we infer that rain consists of 'patches' whose mean liquid water content is determined by turbulence with each patch being statistically homogeneous. For l>lc, we have Stl<1 and due to the observed statistical homogeneity for l

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