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Monday, August 3, 2020 | History

2 edition of Quasi-steady droplet phase change in the presence of convection found in the catalog.

Quasi-steady droplet phase change in the presence of convection

John K Dukowicz

Quasi-steady droplet phase change in the presence of convection

by John K Dukowicz

  • 14 Want to read
  • 8 Currently reading

Published by [Dept. of Energy], Los Alamos Scientific Laboratory, for sale by the National Technical Information Service] in Los Alamos, N.M, [Springfield, Va .
Written in English

    Subjects:
  • Drops,
  • Evaporation -- Mathematical models,
  • Heat -- Transmission,
  • Mass transfer

  • Edition Notes

    StatementJohn K. Dukowicz
    SeriesLA ; 7997-MS
    ContributionsLos Alamos Scientific Laboratory
    The Physical Object
    Pagination18 p. ;
    Number of Pages18
    ID Numbers
    Open LibraryOL17964198M

    In this paper, we developed a dynamic growth model, which considers the continuous and multiscale nature of the droplet growth process from several nanometers to hundreds of microns. This model couples the transient phase change heat transfer and two-phase flow both inside and outside the by: 4. substantial heat transfer owing to the release or absorption of heat of phase change, namely the latent heat. The resulting temperature difference between the droplet and its surrounding gas medium causes a flow of sensible heat by thermal diffusion. With the quasi-steady-state approximation, energy balance at the droplet surface leads to (ˆ.

    The effect of fluctuation of mass loss of the liquid induced by horizontal vapour diffusion becomes the primary instability mechanism in a very thin region. The effects of the resistance of phase change and the time derivative of the interface concentration are also by: 5.   here, u g represents the velocity of the gas phase, D is the diffusion coefficient (m 2 s −1) and C v is the specific heat capacity under constant volume (kJ/kgK). For a sessile droplet drying Author: Abdullah Al-Sharafi, Bekir S Yilbas, Hussain Al-Qahtani.

    The droplet is kept inside an enclosed chamber which is separated from the atmosphere. The strength of fluid convection inside the droplet gradually reduces with time. When crystal starts appearing inside the droplet, the fluid convection is disturbed by the presence of crystal.   Unlike a droplet on the pan, the vapor from the medium, not from the droplet itself, levitates the droplet. Furthermore, abrupt phase change from liquid to solid occurs along with film boiling during cooling down of the droplets. Here, we investigate the vitrification of a droplet via rapid freezing and its levitation by the Leidenfrost by:


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Quasi-steady droplet phase change in the presence of convection by John K Dukowicz Download PDF EPUB FB2

@article{osti_, title = {Quasi-steady droplet phase change in the presence of convection}, author = {Dukowicz, J K}, abstractNote = {Simple expressions for the rate of change of droplet mass and droplet temperature are derived for an arbitrary convective environment, under the assumptions: (1) unity Lewis number, or constant Lewis number and equal gas-phase species C/sub p/, and (2) uniform.

Get this from a library. Quasi-steady droplet phase change in the presence of convection. [John K Dukowicz; Los Alamos Scientific Laboratory.].

Equivalence Ratio Internal Combustion Engine Cylinder Head Hand Panel Swirl Ratio These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm by: 4.

Quasi-steady droplet phase-change in the presence of convection. Technical Report LAMS, Los Alamos Scientific Laboratory, aug nor any other complete description. Quasi-steady droplet phase change in the presence of convection, Los Alamos Report LAMS Google Scholar Dukowicz, J.

A particle-fluid numerical model for liquid by: 2. The current work aims to address the simultaneous influence of two non-uniform magnetic-fields on the melting phase change in the presence of the free convection effects.

The study parameters of the current work are the intensity ratio of two non-uniform magnetic-fields γ r, Hartmann number Ha, and magnetic number Mn by: 2.

Droplet vaporization model in the presence of thermal radiation the quasi-steady (QS) assumption in the gas phase of droplet evaporation is evaluated.

due to relative droplet–gas motion. Fig. Phase change and transient temperature of a 6 mm fresh water droplet falling from the height of 10 m at a sub-zero environment for residence times of (a) τ 1 = 0 ms, (b) τ 2 = ms, (c) τ 3 = ms, (d) τ 4 = ms, and (e) τ 5 = by: 5.

In droplet combustion, (even in the spherically symmetric case) both molecular diffusion and bulk convection, termed Stephan flow, (produced as a result of phase changes at the droplet surface) are important phenomena. For vigorously vaporizing droplets, the Stephan flow velocity dominates over the diffusion velocity near the droplet surface.

which boiling or condensation occurs, the presence of a nearby solid surface is necessary for the rapid supply or removal of the latent heat inherent in the phase change. The presence of this wall modifies the flow patterns and other characteristics of these multiphase flows and this chapter will address those additional Size: KB.

Droplet wettability is altered by the substrate and thus the contact dynamics as well. The different modes of spreading are due to the interaction between the binary liquid and the substrate.

These modifications are influenced by the evaporation occurring at the triple line and thus the total of evaporation. This model assumes a uniform droplet temperature. In addition, the rate of droplet temperature change is determined by the heat balance, which states that the heat convection from the gas to the droplet either heats up the droplet or supplies heat for by: The presence of phase transformation can drive convection in the melt through the liberation of latent heat, the rejection of solute, and the change of density upon freezing.

The classical "quasi-steady" theory has been developed within the context of isolated droplet vaporization studies and is also used in spray models because of its simplicity. This theory predicts a linear evolution of the squared droplet diameter with time and allows estimating the "droplet vaporization rate".

The present simulations focus on the period between initiation of coalescence between two parent droplets and the recovery of a quasi-steady temperature profile in the child droplet. During this period, the increase in liquid volume in a droplet due to condensation is assumed to be by: 1.

Droplet Wetting and Evaporation provides engineers, students, and researchers with the first comprehensive guide to the theory and applications of droplet wetting and evaporation. Beginning with a relevant theoretical background, the book moves on to consider specific aspects, including heat transfer, flow instabilities, and the drying of complex fluid droplets.

In this course “Phase Change and Convection — Modelling and Validation”, the influence of convection on solid-liquid phase change processes is considered at different levels. A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text.

The two-dimensional, unsteady, laminar conservation equations for mass, momentum, energy, and species transport in the gas phase are solved numerically in spherical coordinates in order to study heat and mass transfer, and combustion around a single spherical by: 4.

American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA. This theoretical investigation deals with the vaporization or condensation rate of a motionless liquid droplet using the quasi-steady diffusion-controlled model.

A single-component liquid droplet is considered to be undergoing a phase change within a binary mixture of ideal gases (vapor plus noncondensable gas).Cited by: The heat transfer performance of a single phase fluid (SPF) in microchannels with staggered pins, and the corresponding pressure drop characteristics are presented.

Furthermore, a phase change material (PCM, n-eicosane) fluid was also considered by implementing the effective specific heat capacity model approach to account for the corresponding Author: Satyanarayana Kondle, Jorge L.

Alvarado, Charles Marsh.convection currents and the motion of the bubbles under the influence of buoyancy. Flow Boiling • Boiling is called flow boiling in the presence of bulk fluid flow.

• In flow boiling, the fluid is forced to move in a heated pipe or over a surface by external means such as a Size: 2MB.