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Wednesday, October 14, 2020 | History

3 edition of Effects of droplet interactions on droplet transport at intermediate Reynolds numbers found in the catalog.

Effects of droplet interactions on droplet transport at intermediate Reynolds numbers

Effects of droplet interactions on droplet transport at intermediate Reynolds numbers

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  • 26 Currently reading

Published by National Aeronautics and Space Administration, For sale by the National Technical Information Service in [Washington, D.C.], [Springfield, Va .
Written in English


Edition Notes

StatementJian-Shun Shuen
SeriesNASA contractor report -- 179567, NASA contractor report -- NASA CR-179567
ContributionsUnited States. National Aeronautics and Space Administration
The Physical Object
FormatMicroform
Pagination1 v
ID Numbers
Open LibraryOL14985496M

  Intended to provide an up-to-date overview of the field, this book is also likely to become a standard work of reference on the science of droplets. Beginning with the theoretical background important for droplet dynamics, it continues with a presentation of the various methods for generating single droplets and regular droplet systems. Also included is a detailed description of the Reviews: 3. Rivkind, V. Y. and Ryskin, G. M. Flow structure in motion of a spherical drop in a fluid medium at intermediate Reynolds numbers. Fluid Dynamics (English translation of: Izv. Akad. Nauk SSSR Mekh. Zhidk. Gaza), 11, 5–12, CrossRef Google Scholar.

  We explore the effects of fluid films of variable depths on droplets impacting into them. Corresponding to a range of fluid “film” depths, a non-dimensional parameter—H*, defined as the ratio of the film thickness to the droplet diameter—is varied in the range ≤H*≤ In general, the effect of the fluid film imposes a dramatic difference on the dynamics of the droplet–surface.   Therefore, our theory considers the coupling between the eddy–droplet pair interaction and differential sedimentation. As a result, our theory predicts a smaller enhancement of the relative motion by air turbulence. In figure 14(b), we plot the Stokes numbers and the ratios of droplet terminal velocity to the Kolmogorov velocity (S v =v p /v k).

An examination of the hydrodynamics and heat transfer associated with condensation on a moving drop in the intermediate Reynolds number regime (Re = 0()) has been carried out. The droplet is taken to be initially contaminated with an insoluble monolayer surfactant material. The drop environment is taken to consist of its own vapor and air.   Droplet kinematics and operating diagram. As shown in Fig. 1, droplet transport and particle extraction are the two most important operations in magnetism-based droplet manipulation previous bio-separations and bio-reactions involving magnetic-bead-containing droplets, the encased magnetic particles were separately used either as a droplet dri 16 or as an .


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Effects of droplet interactions on droplet transport at intermediate Reynolds numbers Download PDF EPUB FB2

Effects of droplet interactions on droplet transport at intermediate Reynolds numbers Effects of droplet interactions on drag, evaporation, and combustion of a planar droplet array, oriented perpendicular to the approaching flow, are studied numerically.

The three-dimensional Navier-Stokes equations, with variable thermophysical properties, are solved using finite-difference techniques. For the present array orientation, the effects of interactions on the gasification rates diminish rapidly for Reynolds numbers greater than 10 and spacings greater than 6 droplet diameters.

The effects of adjacent droplets on drag are shown to be by: 6. Get this from a library. Effects of droplet interactions on droplet transport at intermediate Reynolds numbers.

[Jian-Shun Shuen; United States. National Aeronautics and Space Administration.]. The calculations show that the gasification rates of interacting droplets decrease as the droplet spacings decrease.

The reduction in gasification rates is significant only at small spacings and low Reynolds : Jian-Shun Shuen. This book addresses the complex subject of the interactions of droplets and sprays.

Along with a strong theoretical foundation, the book presents results in a way that will be useful for engineering practice, with summaries of key formulae and examples of various spray by: 8 Droplet Interactions with Turbulence and Vortical Structures Individual Droplet Behavior in an Unsteady Flow Vortex–Spray Interactions Time-Averaged Turbulence Models Direct Numerical Simulation 9 Droplet Behavior at.

The monograph Fluid Dynamics and Transport of Droplets and Sprays is a comprehensive exposition of the state of the art in theoretical treatments of droplet and spray problems built upon that foundation. It treats the subject in a broad yet fundamental way and is particularly well suited for use by researchers who have some depth of knowledge.

In this study, we present a numerical investigation on the transport of a nanoparticle-covered droplet through a confined microchannel with a square cross section.

This work is realized via developing a level-set-based computational methodology with the nanoparticle–fluid, nanoparticle–nanoparticle, and nanoparticle–interface interactions. This figure shows the effect of wind speed on the saliva droplet and transport under dispersion and evaporation.

Wind blowing from left to right at speeds of 4 km/h (a) and 15 km/h (b). The environment is at ambient temperature, pressure, and relative humidity of 20 °C, 1 atm, and 50%, respectively, with the ground temperature at 15 °C.

For intermediate to high Reynolds number flow and viscosity ratio, an external circulation may occur in the wake of the droplet. Comparing with a solid particle, the internal circulation delays both the onset of flow separation and wake formation in the external fluid for a circulating drop.

Liquid penetration analysis in porous media is of great importance in a wide range of applications such as ink jet printing technology, painting and textile design. This article presents an investigation of droplet impingement onto metallic meshes, aiming to provide insights by identifying and quantifying impact characteristics that are difficult to measure experimentally.

This book serves as both a graduate text and a reference for engineers and scientists exploring the theoretical and computational aspects of the fluid dynamics and transport of sprays and droplets.

Attention is given to the behavior of individual droplets, including the effects of forced convection due to relative droplet–gas motion, Stefan. The hydrodynamic interaction between a droplet immersed in Couette flow and the containing walls is studied.

The analysis is based on the assumptions that the disturbance flow induced by the droplet is without inertia, that the droplet maintains its nearly spherical shape and that the radius of the droplet is small compared with the distance between the walls.

This paper focuses on the problem of two-droplet impingement on dry and wet surfaces with two Weber numbers (We) of andcorresponding to two Reynolds numbers. This second edition contains more information on droplet-droplet interactions, the use of the mass-flux potential, conserved scalar variables, spatial averaging and the formulation of the multi-continua equations, the confluence of spatial averaging for sprays and filtering for turbulence, direct numerical simulations and large-eddy simulations.

Of interest are the coupled nonlinear interaction effects on the fluid-flow patterns and temperature fields for different free-stream Reynolds numbers, interdroplet distances, liquid gas viscosity ratios, and heat-transfer numbers.

However, droplet spacings and intermediate Reynolds numbers have a profound effect on all droplets. Now on. This theoretical study proposes an analytical model to predict the maximum spread of single droplets on solid surfaces with zero or low Weber and Reynolds numbers.

The spreading droplet is assumed as a spherical cap considering low impact velocities. Since droplet–droplet aerodynamic interaction is not considered here, each droplet is treated as a point particle.

The location and velocity of each droplet were advanced by integrating the equation of motion described in sectionwith a fourth-order, Adams–Moulton scheme for droplet velocity and a fourth-order, Adams–Bashforth.

A detailed numerical simulation has been carried on a stationary three-dimensional array of heptane droplets at intermediate Reynolds numbers (Re). transport effects such as diffusion of heat. The assumptions about the circulation inside a droplet and the assumption that the droplet has a spherical shape are valid in the following ranges of the falling-in-air water droplet radii, Reynolds numbers, and velocities: mm ≤ R ≤ mm, 10 ≤ Re ≤and ≤ U ≤ m s −1.

kernel includes both the effect of turbulence on the relative velocities of the droplets and on the local increases in droplet concentration, the so-called accumulation effect. Under the assumption that this kernel can be extrapolated to atmospheric Reynolds numbers, the results show that for .Calculation of droplet deformation at intermediate Reynolds number using a Volume mation of droplets in steady, uniaxial elongational flow, with intermediate Reynolds number (O(1)− O formed shape of droplets under flow conditions controlled by several param-eters, including Reynolds and Weber numbers, density and viscosity ratios.painting, and coating [1,2].

Droplet impact on solid surfaces has been an active area of research because understanding the physics underpinning the droplet-solid interactions is essential for these applications.

For instance, the droplet spreading and recoiling during impact determines the resolutions of inkjet printing [3,4].