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Sunday, May 10, 2020 | History

2 edition of Diffusion of a chemical species through a viscous boundary layer found in the catalog.

Diffusion of a chemical species through a viscous boundary layer

Jay Keller

Diffusion of a chemical species through a viscous boundary layer

by Jay Keller

  • 321 Want to read
  • 12 Currently reading

Published by Dept. of Energy, Lawrence Berkeley Laboratory, Materials and Molecular Research Division, for sale by the National Technical Information Service] in Berkeley, Calif, [Springfield, Va .
Written in English

    Subjects:
  • Diffusion,
  • Viscous flow,
  • Boundary layer

  • Edition Notes

    StatementJay Keller, Materials and Molecular Research Division, Lawrence Berkeley Laboratory, University of California
    SeriesLBL ; 8069
    ContributionsLawrence Berkeley Laboratory. Materials and Molecular Research Division
    The Physical Object
    Pagination26 p. ;
    Number of Pages26
    ID Numbers
    Open LibraryOL14880682M

    The steady two-dimensional radiative MHD boundary layer flow of an incompressible, viscous, electrically conducting fluid caused by a nonisothermal linearly stretching sheet placed at the bottom of fluid saturated porous medium in the presence of viscous dissipation and chemical reaction is studied. The governing system of partial differential equations is converted to ordinary differential Cited by: 6. In the case of a reaction-diffusion equation, c depends on t and on the spatial variables. To fully specify a reaction-diffusion problem, we need the differential equations, some initial conditions, and boundary conditions. The initial conditions will be initial values of the concen-trations over the domain of the problem. The boundary.

    Mass transfer by convection involves the transport of material between a boundary surface (such as solid or liquid surface) and a moving fluid or between two relatively immiscible, moving fluids. Don’t confuse this phenomenon with the movement of mass caused by a chemical species simply being carried along in a fluid stream (advection). the diffusion of a chemically reactive species in a laminar boundary layer flow. Goddard and Acrivos [3] analyzed the laminar forced convection mass transfer with homogeneous chemical reaction. A unified boundary layer analysis was applied to the problem of steady state mass transfer of a chemical species, diffusing from aCited by: 1.

    Concentration polarization is a term used in the scientific fields of electrochemistry and membrane science.. In electrochemistry. In electrochemistry, concentration polarization denotes the part of the polarization of an electrolytic cell resulting from changes in the electrolyte concentration due to the passage of current through the electrode/solution interface. boundary layer, heat and mass transfer flow of a viscous, incompressible, electrically conducting fluid past a semi-infinite vertical permeable plate in the presence of a uniform transverse magnetic field with Joul and viscous dissipation effects, taking into account of the homogeneous chemical reaction of .


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Diffusion of a chemical species through a viscous boundary layer by Jay Keller Download PDF EPUB FB2

Get this from a library. Diffusion of a chemical species through a viscous boundary layer. [Jay Keller; Lawrence Berkeley Laboratory.

Materials and Molecular Research Division.]. Title: Diffusion of a chemical species through a viscous boundary layer The energy and species equation can be made to reduce to the same form under suitable assumptions. This result is discussed and used to determine the concentration difference of H/sub 2/S in a.

DIFFUSION OF A CHEMICAL SPECIES THROUGH A VISCOUS BOUNDARY LAYER. Author(s): Keller, J. et al. Main Content Metrics Author & Article Info. Main Content. Download PDF to View View Larger. Thumbnails Document Outline Attachments. Previous. : J. Keller. Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link)Author: J.

Keller. A chemically reactive species is emitted from the surface of a body located in a hydrodynamic flow field. It diffuses into the fluid where it undergoes a simple isothermal, homogeneous transformation.

The analysis given enables one to trace the reaction history of this component in a laminar boundary layer flow which develops over the surface of a illustration the development of a Cited by: The Insulation/symmetry condition has the source term in Equation set to zero: () The Chemical Engineering Module also allows imposition of a Concentration boundary condition: () The Convective flux boundary condition assumes that all mass passing through this boundary is convection-dominated.

It diffuses into the fluid where it undergoes a simple isothermal, homogeneous transformati On the Diffusion of a Chemically Reactive Species in a Laminar Boundary Layer Flow: The Physics of Fluids: Vol 1, No 1. by: The similarities among the "molecular" or "diffusive" transport mechanisms--heat conduction, diffusion of chemical species, and viscous transfer of momentum--are highlighted.

Conservation equations for scalar quantities are derived first in general form, and then used to obtain the governing equations for total mass, energy, and chemical species.

The effects of the three parameters k, sc and β on the momentum and concentration boundary layers are shown in Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. Fig. 6, Fig. 7 illustrate that the destructive chemical reaction rate parameter β (β > 0) reduces the concentration of H(η) and contrarily increases S(η).This shows that the diffusion rate can be significantly Cited by: Efiects of chemical reaction, heat and mass transfer on boundary layer °ow over a porous wedge with heat radiation in the presence of suction or injection.

Efiects of chemical reaction, heat and mass transfer on boundary layer °ow over a porous wedge with heat radiation in the presence of suction or injection.

amy⁄ B. Size: KB. ture and mass diffusion in the presence of heat source or sink. There have been few studies on heat transfer boundary layer flow in the literature however mass transfer flow through an inclined plate with the effect of chemical reaction and thermal diffusion effects still need more at File Size: KB.

The solute diffusion in boundary layer flow of an incompressible fluid through a porous medium over a porous flat plate with first-order chemical reaction and with variable surface concentration.

Mass Transfer with Chemical Reaction 11 phase boundary. Mass transfer by convection within this layer is assumed to be insignificant, and accordingly the transport is solely achieved by steady state diffusion.

Beyond the thin layers the turbulence is sufficient to eliminate concentration Size: 48KB. A finite element analysis is developed for transport of a chemical species through a viscous fluid with reaction at a solid boundary.

In particular, we examine the relative effect of diffusion, convection and reaction on the quantity of mass transported through the fluid and reacting at the by: 3.

which means that Bernoulli does not work inside a boundary layer. Bernoulli can only be applied outside the boundary layer where, by definition, viscous effects are negli-gible. THE PRESSURE GRADIENT ACROSS A BOUNDARY LAYER The pressure at a point in a boundary layer is very nearly the same as that in the free stream just above Size: KB.

The similarities among the molecular or diffusive transport mechanisms--heat conduction, diffusion of chemical species, and viscous transfer of momentum--are highlighted.

Conservation equations for scalar quantites are derived first in general form, and then used to obtain the governing equations for total mass, energy, and chemical species. mal diffusion of a chemically reactive species in a lami- nar boundary layer flow.

Dusty viscous and visco-elastic fluids have been discussed by Saffman [2], Micheal and Norey [3], Raptis and Perdikis [4]. Singh [5] proposed the study of free convection and mass diffusion of a dusty visco-elastic (Walter’s Liquid Model-B) fluid flow.

Similarity solution of MHD boundary layer flow with diffusion and chemical reaction over a porous flat plate with suction/blowing Article (PDF Available) in Meccanica 47(4) April diffusion and diffusion thermo chemical species.

The phenomenon of heat and mass transfer frequently exists in chemical reaction on heat and mass transfer in a laminar boundary layer flow has been studied under different conditions by several authors []. viscous incompressible fluid through a porous medium occupying a semi-infinite Cited by: 2.

The objective of the present study is to examine the fully developed free convective MHD flow of an electrically conducting viscous incompressible fluid in a vertical porous channel under influence of asymmetric wall temperature and concentration in the presence of chemical reaction.

The heat and mass transfer coupled with diffusion-thermo effect renders the present analysis interesting and Cited by: 3. R.S.R. Gorla, Unsteady mass transfer in the boundary layer on a continuous moving sheet electrode, J.

Electrochem. Soc., (6),[5] P. L. Chambré and J. D. Young, On the diffusion of a chemically reactive species in a laminar boundary layer flow, Physics of fluids, 1, [6].diffusion and diffusion of chemical species. The study of magneto hydrodynamic laminar boundary layer flow of a viscous incompressible heat generating past an infinite vertical porous plate find useful application in many engineering problems such as MHD generator, plasma studies, nuclear reactors, geothermal extractors and.Diffusive boundary layers—Microscopic organisms and colonies smaller than the Kolmogorof length scale in the sea are surrounded by a DBL through which the exchange of solutes between the organisms or colonies and the surround-ing water occurs by molecular diffusion.

The radial diffusive flux of a chemical solute through the DBL is given by Sher-Cited by: