Collisions of small drops in a turbulent flow. Part I: Collision efficiency. Problem formulation and preliminary results

From: Journal of the Atmospheric Sciences | Date: August 1, 1999| Author: | Copyright information

ABSTRACT

A mathematical approach to the calculation of the collision efficiency between droplets within a turbulent flow is suggested. The problem of drops' hydrodynamic interaction is reconsidered taking into account additional inertia-induced relative velocities between droplets of different sizes moving within a turbulent flow. The relative velocities are determined at different points of a turbulent flow using a model of homogeneous and isotropic turbulent flow.

The collision efficiencies of Stokesian droplets are calculated using the superposition method. Two important results have ...

Related newspaper, magazine, and trade journal articles from HighBeam Research

(Including press releases, facts, information, and biographies)

Turbulence in the Fast Lane
; ...laminar flow) to when it becomes chaotic (turbulent flow). Aerothermodynamic heating largely...effects on the transition from laminar to turbulent flow. Currently, these simulations guzzle...where the transitions from laminar to turbulent flow occur in engines and on surfaces...
Pinning Down Turbulent Flow Via New Formula
; ...Engineers can't often easily predict how a turbulent flow will behave. Now, researchers at Johns...precise computer models that describe turbulent flow. Charles Meneveau, a professor of mechanical...tracking two particles as they move with a turbulent flow and writing an equation to ...
Pinning down turbulent flow via new formula.(computing)(Brief Article)
; ...Engineers can't often easily predict how a turbulent flow will behave. Now, researchers at Johns...precise computer models that describe turbulent flow. Charles Meneveau, a professor of mechanical...tracking two particles as they move with a turbulent flow and writing an equation to ...
Eductor redux.(PLATING CLINIC)
; ...indicates that the vibratory and turbulent flow methods of agitation offer real...plating industry; however, the turbulent flow method is used. The use of eductors will give you a turbulent flow environment and based on the information...
Errata
; In Bechtel, T B. (2005) A Computational Technique for Turbulent Flow of Wastewater Sludge. Water Environ. Res., 77, 417, the x-axis on Figure 2 should be labeled y/R rather than y (m).
Collisions of Cloud Droplets in a Turbulent Flow. Part V: Application of Detailed Tables of Turbulent Collision Rate Enhancement to Simulation of Droplet Spectra Evolution
; ...investigation of cloud droplet collisions in turbulent flow with characteristics that are typical...investigations, and the validity of turbulent flow description (e.g., Pruppacher and Klett...investigation of cloud droplet collisions in a turbulent flow with the characteristics ...
Collisions of Small Drops in a Turbulent Flow. Part III: Relative Droplet Fluxes and Swept Volumes
; ...new statistical representation of a turbulent flow has been proposed based on the results...proposed, statistical properties of turbulent flow are represented by a set of noncorrelated...assigned to a certain point of the turbulent flow. Each such point can be surrounded...
State of the art agitations.(painting clinic)
; ...indicates that the vibratory and turbulent flow (eductor) methods of agitation...plating industry; however, the turbulent flow method is used. The use of eductors will give you a turbulent flow environment and based on the information...
Collision Rates of Cloud Droplets in Turbulent Flow
; ...simulations of an evolving turbulent flow field have been performed...function of the radial relative velocities among droplets and these...cloud droplets with a turbulent flow field have been undertaken...collisions of droplets in turbulent flow compared to the ...
Collisions of Cloud Droplets in a Turbulent Flow. Part IV: Droplet Hydrodynamic Interaction
; ...droplets' collision efficiency in a turbulent flow with the properties typical of atmospheric...III, the statistical properties of a turbulent flow are represented by a set of noncorrelated...assigned to a certain point of the turbulent flow. Each such point can be surrounded...