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Friday, May 15, 2020 | History

3 edition of Convective flows in enclosures with vertical temperature or concentration gradients found in the catalog.

Convective flows in enclosures with vertical temperature or concentration gradients

Convective flows in enclosures with vertical temperature or concentration gradients

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

    Subjects:
  • Convection (Astrophysics)

  • Edition Notes

    StatementL.W. Wang and A.T. Chai and D.J. Sun.
    SeriesNASA technical memorandum -- 101373.
    ContributionsChai, An-Ti., Sun, D. J., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17658837M

      Double-diffusive natural convection flow in square enclosure filled with nanofluid is studied in this paper. Water based nanofluid containing various nanoparticles including Cu, Ag, Al 2 O 3 ⁠, and TiO 2 is used in the numerical analysis. The upper and lower walls of the enclosure are well insulated and impermeable and the left and right walls are imposed to constant temperatures and Cited by: mass transfer rates and there exists a threshold for the convective motion even when Le=1. In this work, a new numerical technique based on the Galerkin and the nite element methods is developed to study the convective instability problem within a rectangular porous enclosure subject to horizontal gradients of temperature and solute by:

    Natural Convection in Enclosures 14 Chapter 6: Natural Convection Advanced Heat and Mass Transfer by Amir Faghri, Yuwen Zhang, and John R. Howell When a warm jet is formed at the top and a cold jet is formed at the bottom, there will be a temperature gradient along the vertical direction. The heat conduction due to this temperature gradient is.   Natural convection with Soret effect in a binary fluid saturating a shallow horizontal porous layer is studied both numerically and analytically. The vertical walls of the enclosure are heated and cooled by uniform heat fluxes and a solutal gradient is imposed vertically. In the formulation of the problem, we use the Darcy model and the density variation is taken into account by the Boussinesq.

    ABSTRACT Soret effect on fluid flow and heat and mass transfer induced by double-diffusive natural convection in a square porous enclosure, submitted to cross gradients of temperature and concentration, is studied numerically. The cavity is heated from below and cooled from the top, while its vertical walls are adiabatic and maintained at constant but different by: A new edition of the bestseller on convection heat transfer A revised edition of the industry classic, Convection Heat Transfer, Fourth Edition, chronicles how the field of heat transfer has grown and prospered over the last two decades. This new edition is more accessible, while not sacrificing its thorough treatment of the most up-to-date information on current research and applications in.


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Convective flows in enclosures with vertical temperature or concentration gradients Download PDF EPUB FB2

Tical temperature and/or concentration gradients. To gain insights on such flows, an experimental program was initiated to study flows In rectangu-lar enclosures with vertical temperature or concen-tration gradients between horizontal end walls. The present work for purely thermal cases Is intended to glve a comprehensive understanding of.

Get this from a library. Convective flows in enclosures with vertical temperature or concentration gradients. [L W Wang; A T Chai; D J Sun; United States. National Aeronautics and. The main objective is to obtain more experimental data on convective flows in enclosures with vertical temperature or concentration gradients.

Among actual crystal systems the parameters vary widely. The parametric ranges studied for mass transfer are mainly dictated by the electrochemical system employed to impose concentration : L.

Wang, D. Sun and A. Chai. The main objective is to obtain more experimental data on convective flows in enclosures with vertical temperature or concentration gradients. Among actual crystal systems the parameters vary widely. The parametric ranges studied for mass transfer are mainly dictated by the electrochemical system employed to impose concentration gradients.

Convective flows in enclosures with vertical temperature or concentration gradients. By D. Sun, A. Chai and L. Wang. Topics: FLUID MECHANICS AND HEAT TRANSFERAuthor: D. Sun, A. Chai and L. Wang. The enclosure is heated and cooled along the vertical walls and solutal gradient is imposed vertically.

The objective of the work is to identify the flow regime for thermal and solutal dominated. The onset of thermosolutal convection and finite-amplitude flows, due to vertical gradients of heat and solute, in a horizontal rectangular enclosure are investigated analytically and numerically.

Acoustic computations for a moving cylinder in flows with temperature gradients. MAUTNER; T. MAUTNER. U.S. Navy, Naval Command, Control, and Ocean Surveillance Center, San Diego, CA. Convective flows in enclosures with vertical temperature or concentration gradients.

Oscillatory double-diffusive convection in a rectangular enclosure with combined horizontal temperature and concentration can be observed in the secondary cell flow. Chang and Lin [ll] examined the vertical surfaces and the concentration gradient at respective surface and thus double-diffusive con- Fig.

Physical model. We investigate natural convection driven by a horizontal temperature gradient and a vertical concentration gradient in fluid-filled enclosures with obstructions inside it.

Within the domain, nine adiabatic and impermeable cylinders are placed, occupying 30% of the domain : Manu Chakkingal, Roland Voigt, Chris R.

Kleijn, Saša Kenjereš. The flow is driven by buoyancy forces due to temperature and solutal gradients. Constant temperature and concentration are imposed along the two vertical side walls of the cubic enclosure, while the remaining walls are impermeable and by:   A control-volume method based explicit computational scheme is used to simulate the convective transport in the enclosure.

The longitudinal and the transverse temperature gradients strongly affect the flow structure in the enclosure. The mean fluid motion alters the heat transfer behavior compared to the pure : Saeid R.

Angeneh, Murat K. Aktas. Convection in rectangular enclosures with combined horizontal temperature and concentration gradients is studied. An electrochemical system is employed to impose the concentration gradients. Due to a large difference between the thermal and solutal diffusion rates the flow possesses double-diffusive characteristics.

Very complex fingering flow patterns are observed around the two-phase Cited by: 1. Oscillatory double-diffusive convection in a rectangular enclosure with combined horizontal temperature and concentration gradients Author links open overlay panel Tatsuo Nishimura Mikio Wakamatsu Alexandru M.

MoregaCited by: Steady, laminar, double diffusion natural convection flow in a square enclosure with partially active vertical wall is considered. The enclosure is filled with a binary fluid and subjected to horizontal temperature and concentration gradients.

The flow is driven Author: Abdennacer Belazizia, Smail Benissaad, Said Abboudi. In this work, we consider a two-dimensional numerical study of double diffusion natural convection in a square enclosure with horizontal temperature and concentration gradients.

The flow is driven by thermal and solutal buoyancies. Half of the left vertical wall is maintained at a uniform temperature and concentration.

This half is either in the bottom, in the middle or at the top of the by: 3. Study on free convection flow, due to the effect of temperature change has drawn significant interest recently [12,13,14,15,16].Authors in [] formulated the problem of coupled heat and mass transfer by natural convection from a vertical, semi-infinite flat plate, embedded in a porous medium in the presence of an external magnetic field and internal heat generation or absorption by: 2.

Double-diffusive convection in a rectangle with opposing horizontal temperature and concentration gradients. International Journal of Heat and Mass Transfer, Vol. 33, Issue. 8, p. International Journal of Heat and Mass Transfer, Vol. 33, Issue. 8, p. Cited by: Double-diffusive natural convection in a horizontal enclosure is studied numerically with the use of Boundary Element Method.

The enclosure is Author: J. Kramer, R. Jecl, L. Skerget. an enclosure imposed at thermal and concentration gradients, the flow may become 3D. Several different configurations have been studied when considering double diffusive natural convection in porous enclosures which differ from each other regarding the positions of the thermal and concentration gradients.

The most. The fluid flow and heat transfer in regime III can be obtained via boundary layer analysis. Figure 1 shows contours of dimensionless temperature, pressure, horizontal, and vertical velocities for natural convection in a square enclosure (H / L = 1) heated from its left side and cooled from its right side while insulated from the top and bottom.CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The current study is primarily motivated to gain better understanding of the flow pattern, the temperature and concentration distributions caused by thermosolutal convection in an electrochemical system with a vertical middle partitions.

The test cell is a rectangular enclosure formed with acrylic and copper plates.In the present work, we study the onset of double diffusive convection in vertical enclosures with equal and opposing buoyancy forces due to horizontal thermal and concentration gradients (in the case Gr S /Gr T =−1, where Gr S and Gr T are, respectively, the solutal and thermal Grashof numbers).

We demonstrate that the equilibrium solution is linearly stable until the parameter Ra T |Le−1 Cited by: