2012
DOI: 10.1088/1367-2630/14/10/105030
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Spatial clustering of polydisperse inertial particles in turbulence: I. Comparing simulation with theory

Abstract: Particles that are heavy compared to the fluid in which they are embedded (inertial particles) tend to cluster in turbulent flow, with the degree of clustering depending on the particle Stokes number. The phenomenon is relevant to a variety of systems, including atmospheric clouds; in most realistic systems particles have a continuous distribution of sizes and therefore the clustering of 'polydisperse' particle populations is of special relevance. In this work a theoretical expression for the radial distributi… Show more

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Cited by 52 publications
(80 citation statements)
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“…When the droplet size distribution is broad, it is necessary to understand the influence of different Stokes number on droplet dispersion. However, only few studies have considered polydispersed droplets, for instance, see Lazaro & Lasheras (1992), Kiger & Lasheras (1995), Aliseda et al (2002), Ferrand et al (2003), Saw et al (2008Saw et al ( , 2012a. (ii) As pointed out by Fessler et al (1994), it is not only important to know what particle size is most preferentially concentrated but also at what scale the concentration occurs.…”
Section: Motivationmentioning
confidence: 99%
“…When the droplet size distribution is broad, it is necessary to understand the influence of different Stokes number on droplet dispersion. However, only few studies have considered polydispersed droplets, for instance, see Lazaro & Lasheras (1992), Kiger & Lasheras (1995), Aliseda et al (2002), Ferrand et al (2003), Saw et al (2008Saw et al ( , 2012a. (ii) As pointed out by Fessler et al (1994), it is not only important to know what particle size is most preferentially concentrated but also at what scale the concentration occurs.…”
Section: Motivationmentioning
confidence: 99%
“…At first glance, these numbers appear rather small compared to what has been observed in various studies of inertial particle clustering (e.g. [12,72,73]). However, comparing the diffusiophoretic velocity to the Kolmogorov velocity v η helps to classify these results properly.…”
Section: Resultsmentioning
confidence: 66%
“…Defining a Stokes number Stk for inertial particles as Stk = τ p /λ −1 , we similarly divide the maximum diffusiophoretic velocity by v η , which results in a non-dimensional number that is 3 × 10 −2 . According to Saw et al [72], inertial particles with Stk similar to 3 × 10 −2 have clustering exponents of order 10 −2 . This agrees well with the clustering exponents found in our study.…”
Section: Resultsmentioning
confidence: 99%
“…Consequently, the magnitude of cloud droplet clustering in situ and in the laboratory has been a subject of intense interest for the last 25 years (see, e.g., Baker, 1992;Baumgardner et al, 1993;Brenguier, 1993;Borrmann et al, 1993;Shaw et al, 1998;Uhlig et al, 1998;Davis et al, 1999;Kostinski and Jameson, 2000;Chaumat and Brenguier, 2001;Kostinski and Shaw, 2001;Pinsky and Khain, 2001;Shaw et al, 2002;Shaw, 2003;Marshak et al, 2005;Larsen, 2006;Lehmann et al, 2007;Salazar et al, 2008;Saw et al, 2008;Small and Chuang, 2008;Baker and Lawson, 2010;Siebert et al, 2010;Bateson and Aliseda, 2012;Larsen, 2012;Saw et al, 2012b;Beals et al, 2015;Siebert et al, 2015;O'Shea et al, 2016).…”
Section: Introductionmentioning
confidence: 99%
“…Although arguments can be made for any number of these tools, this study focuses on the radial distribution function (rdf or g(r)) because (i) it is a direct scale-localized measure of deviation from perfect spatial randomness, (ii) it is directly related to variances and means through the correlation-fluctuation theorem, (iii) many numerical and theoretical discussions about particle clustering are explicitly presented in terms of the radial distribution function (see, e.g., Balkovsky et al, 2001;Holtzer and Collins, 2002;Collins and Keswani, 2004;Chun et al, 2005;Salazar et al, 2008;Saw et al, 2008;Zaichik and Alipchenkov, 2009;Monchaux et al, 2012;Saw et al, 2012a;Larsen et al, 2014), and (iv) most other common methods of characterizing cloud droplet clustering can be derived from or quantitatively related to a measurement of the radial distribution function (Landau and Lifshitz, 1980;Kostinski and Jameson, 2000;Shaw et al, 2002;Larsen, 2006Larsen, , 2012.…”
Section: Introductionmentioning
confidence: 99%