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Saturday, May 9, 2020 | History

2 edition of Effects of turbulence on cloud-droplet collision rates. found in the catalog.

Effects of turbulence on cloud-droplet collision rates.

C. L. Olson

Effects of turbulence on cloud-droplet collision rates.

by C. L. Olson

  • 99 Want to read
  • 39 Currently reading

Published by Rand Corporation in Santa Monica, Calif .
Written in English

    Subjects:
  • Cloud physics.,
  • Precipitation (Meteorology),
  • Turbulence.

  • Edition Notes

    Includes bibliography.

    SeriesRand Corporation. Research memorandum -- RM-5489, Research memorandum (Rand Corporation) -- RM-5489..
    The Physical Object
    Pagination37 p.
    Number of Pages37
    ID Numbers
    Open LibraryOL16542890M

    of cloud droplets by turbulence: Effects on the early evolutionof cumulus cloud droplet spectra, J. Atmosph. Sci., 55(11),– Shima, S., K. Kusano, A. Kawano,T. Sugiyama,and S. Kawahara (),The super-droplet method for the numerical simulation of clouds and precipitation: a . TURBULENCE AND DROPLET CLUSTERING IN SHALLOW CUMULUS: THE EFFECTS OF AEROSOLS AND CLOUD HEIGHT it can also have implications related to precipitation formation through collision{coalescence. In this work, aerosol{cloud relationships are derived from warm continental cumuli sub- to 10 4 m scale) for when each cloud droplet was.

    Hsieh et al. () calculated the conversion rate using the turbulent collision kernel of Ayala et al. (b) and found that turbulence effects can increase the conversion rate by a factor of to for two specific initial cloud droplet size distributions, relative to purely gravitational collection. Turbulence effect on coagulatioinal growth of cloud droplets: Authors: is one of the most challenging problems for cloud droplet growth is neither dominated by condensation nor gravitational coagulation in the sizerange of 15 μm ˜ 50 μm in radius. Turbulence-initiated coagulation is argued to be the mechanismto bridge the.

      Droplet collisions and interaction with the turbulent flow within a two-phase wind tunnel quantifications of droplet collision rates and comparisons with theoretical S. K. Mitra, S. C. Wurzler, and H. R. Pruppacher, “ A wind tunnel study of the effects of Cited by: where,, ξ is the droplet growth factor and depends on thermodynamic quantities (Rogers and Yau, ),, x≡r 2, and r is the droplet radius. In Equation 1, the first term is the drift due to the mean supersaturation experienced by a group of cloud droplets; it represents mean r 2 growth, (Rogers and Yau, ).The last term is the diffusion in r 2 space due to supersaturation fluctuations Cited by: 1.


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Effects of turbulence on cloud-droplet collision rates by C. L. Olson Download PDF EPUB FB2

Get this from a library. Effects of turbulence on cloud-droplet collision rates. [C L Olson; Rand Corporation.]. Escape reactions of zooplankton: Effects of light and turbulence. by Singarajah, Title: effects turbulence. Edit Your Search. EFFECTS OF TURBULENCE ON CLOUD-DROPLET COLLISION RATES.

U.S.A.F. Project RAND Memorandum RMPR, July Olson, C. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Direct numerical simulations of an evolving flow field have been performed to explore how turbulence affects the motion and the collisions of cloud droplets.

Large numbers of droplets are tracked through the flow field and their positions, velocities and collision rates have been found to depend on the eddy. proposed a scaling law for the collision kernel and stated that it is independent of Rl when Rl is sufficiently large, as in the case of real clouds.

This paper represents our continued exploration of cloud droplet collisions under turbulence begun by Franklin et Effects of turbulence on cloud-droplet collision rates.

book. (, ). Our purposes are 1) to. Our purposes are 1) to better understand the influence of on the collision statistics by separating its effect from that of the EDR and to clarify the physical meaning of in DNS; 2) to quantify the influence of turbulence intensity on cloud droplet collisions by simulating turbulent flow fields over a broad range of EDRs; and 3) to seek a Cited by: 15th Australasian Fluid Mechanics Conference The University of Sydney, Sydney, Australia December The Effect of Turbulence on Cloud Droplet Collision Rates C.N.

Franklin1, P.A. Vaillancourt2, M.K. Yau1 and P. Bartello1,3 1Department of Atmospheric and Oceanic Sciences McGill University, Montreal, Quebec, H3A 2K6 CANADA. The effect of air turbulence on the geometric collision kernel of cloud droplets can be predicted if the effects of air turbulence on two kinematic pair statistics can be modeled.

Collision statistics of cloud droplets in turbulent flow have been calculated for 12 droplet size combinations in four flow fields with levels of the eddy dissipation rate of turbulent kinetic. Historically, there were several attempts to analyze the effects of air turbulence on the collision rates of cloud droplets.

Arenberg () is perhaps the first to recognize qual-itatively that air turbulence can increase the relative motion of cloud droplets, followed by semi-analytical studies of Gabilly () and East and Marshall (). of air turbulence is based mostly on numerical simu-lations and qualitative theoretical arguments.

It has been shown that the collision rate of cloud droplets can be enhanced by several effects of turbulence, in-cluding (1) enhancedrelative motion due to differential acceleration and.

the effects of air turbulence on the collision rates of cloud droplets. Arenberg () is perhaps the first to recognize qualitatively that air turbulence can increase the relative motion of cloud droplets, followed by semi-analytical studies of Gabilly () and East and Mar. Droplet velocities, concentrations, and geometric collision rates are calculated for droplets falling into Burgers vortices as a step toward understanding the role of turbulence-induced collisions of cloud water droplets.

The Burgers vortex is an often used model of vortices in high Reynolds number turbulence. Droplet radii considered 20, and 40 μ m; those radii are relevant to warm Cited by:   Turbulence and cloud droplets in cumulus clouds. Wang L-P and Grabowski W W Effects of turbulence on the geometric collision rate of sedimenting droplets: Franklin C N, Vaillancourt P A, Yau M K and Bartello P Collision rates of cloud droplets in turbulent flow J.

Atmos. Sci. 62 – CrossrefCited by: 8. Additionally, shear due to the smallest scales of turbulence increases collision rates of zero‐inertia droplets.

In ClusColl, a 3‐D triplet map for droplets captures both effects. We implemented collision detection, enabling simulation of droplet collisions and coalescence, and a sedimentation treatment in : Steven K. Krueger, Alan R.

Kerstein. Broadening of cloud droplet size distributions and warm rain initiation associated with turbulence: an overview LU Chun-Songa,b, LIU Yan-Gang c, NIU Sheng-Jiea and XUE Yu-Qia aKey Laboratory of meteorological disaster, ministry of education (KLme)/Joint international research Laboratory of climate and environment.

The actual effect of aerosol loading on cloud droplet relative dispersion are contradictory, however; some studies suggest an increase in the relative dispersion with a decrease in the aerosol loading (e.g. [Lu et al.,]) while other observations show the opposite trend (e.g.

[Martin et al.,Liu and Daum,Pawlowska et al Cited by: 4. Effect of combined turbulence and gravity on cloud droplets growth *Xiang-Yu Li, Axel Brandenburg, Nils Haugen, Cloud droplet growth by condensation Water vapor flux towards the droplet Growth of cloud droplets in 3-D turbulence Collision driven by the combined turbulence and gravity is.

@article{osti_, title = {Aerosol indirect effect from turbulence-induced broadening of cloud-droplet size distributions}, author = {Chandrakar, Kamal Kant and Cantrell, Will and Chang, Kelken and Ciochetto, David and Niedermeier, Dennis and Ovchinnikov, Mikhail and Shaw, Raymond A.

and Yang, Fan}, abstractNote = {Here, the influence of aerosol concentration on cloud droplet size. The paper is focused on inertia effects among drops moving within a turbulent cloud on size distribution evolution and formation of rain.

Two related mechanisms are discussed: (1) the occurrence of inertia-induced relative velocities between drops falling within a turbulent flow, and (2) the tendency of inertial drops to concentrate within certain areas of turbulent flow with a corresponding Cited by: Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD)/Key Laboratory for Aerosol–Cloud–Precipitation of China Meteorological Administration, Nanjing University of Information Science.

Space is devoted to effects of turbulence on diffusional growth (Sec.pages –), effects of turbulence on water droplet collisions (Sec. ), and the spatial orientation of Cited by: Turbulence has often been invoked as a key process in this context since it can enhance collision rates via inertial clustering [9,10] and the so called “sling effect” [11].

Turbulence also induces fluctuations in the supersaturation field that can potentially broaden droplet spectra in the condensational stage [8]. Early studies using.To consider the growth of cloud droplets by condensation in turbulence, the Fokker–Planck equation is derived for the droplet size distribution (droplet spectrum).

This is an extension of the statistical theory proposed by Chandrakar and coauthors in for explaining the broadening of the droplet spectrum obtained from the “Π-chamber Cited by: 3.