Numerical Study of High Rayleigh Number Turbulent Natural Convection in Enclosures PDF Download
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Author: Joseph L. Mandi
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 260
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Author: Joseph L. Mandi
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 260
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Book Description
Author: Paul William Giel
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 330
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Author: Graham De Vahl Davis
Publisher:
ISBN: 9780909287351
Category : Heat
Languages : en
Pages : 18
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Author: N. O. Weiss
Publisher: Cambridge University Press
ISBN: 052119055X
Category : Science
Languages : en
Pages : 411
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Book Description
Leading experts present the current state of knowledge of the subject of magnetoconvection from the viewpoint of applied mathematics.
Author: Graham De Vahl Davis
Publisher:
ISBN: 9780909287375
Category : Fluid dynamics
Languages : en
Pages : 21
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Author: Charles Randall Walker
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 150
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Author's abstract: Numerical simulation was used to investigate natural convection in horizontal and vertical enclosures with and without an internal heat source. Natural convection in rectangular enclosures is found in many real-world applications. Included in these applications are the energy efficient design of buildings, operation and safety of nuclear reactors, solar collector design, passive energy storage, heat transfer across multi-pane windows, thermo-electric refrigeration and heating devices, and the design-for-mitigation of optical distortion in large- scale laser systems. Considering all these applications, especially controlling heat transfer in nuclear power plants, knowledge and research results of natural convection in enclosure play a vital role in environmental impact management studies. This study simulated horizontal enclosures heated from below (configuration 1) and vertical enclosures heated from the side (configuration 2) with a variety of different aspect ratios (AR) and Rayleigh numbers (Ra). Each aspect ratio (1, 2, 4, 6, 8, and 10) was examined using different sets of Rayleigh numbers. The first numerical experiment used only external Rayleigh number (RaE = 2×104, 2×105, and 2×106) which simulated natural convection in enclosures for outside temperature gradient only. The second case used a constant external Rayleigh number (RaE = 2×105) with a changing internal Rayleigh number (RaI = 2×104, 2×105, and 2×106). The third simulation used a constant internal Rayleigh number (Ra I = 2×105) and a changing external Raleigh number (RaE = 2×104, 2×105, and 2×106). All three cases were simulated for each configuration and at each aspect ratio. The streamline and isotherm flow patterns were created to reflect each case. The average heat flux ratio and convection strength were also calculated. Tests with the external temperature gradient only confirmed previous studies. There were many notable outcomes in this study which are discussed in the main body of this thesis work. When RaE> RaI, the results were similar to the study with a varying external Rayleigh number (RaE) and no internal heat source.
Author: Mohammad Hossein Esteki
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 690
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Author: Carlo Cercignani
Publisher: Springer Science & Business Media
ISBN: 1461210399
Category : Science
Languages : en
Pages : 467
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Book Description
Statistical mechanics may be naturally divided into two branches, one dealing with equilibrium systems, the other with nonequilibrium systems. The equilibrium properties of macroscopic systems are defined in principle by suitable averages in well-defined Gibbs's ensembles. This provides a frame work for both qualitative understanding and quantitative approximations to equilibrium behaviour. Nonequilibrium phenomena are much less understood at the present time. A notable exception is offered by the case of dilute gases. Here a basic equation was established by Ludwig Boltzmann in 1872. The Boltzmann equation still forms the basis for the kinetic theory of gases and has proved fruitful not only for a study of the classical gases Boltzmann had in mind but also, properly generalized, for studying electron transport in solids and plasmas, neutron transport in nuclear reactors, phonon transport in superfluids, and radiative transfer in planetary and stellar atmospheres. Research in both the new fields and the old one has undergone a considerable advance in the last thirty years.
Author: Prasart Sukkaset
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 492
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Book Description
Heat transfer characteristics and associated temperature and flow fields for natural convection in two-dimensional, square, partitioned and non-partitioned enclosures have been determined for Grashof numbers ranging from 103 to 106. The vertical side walls of the enclosure are isothermal with all other surfaces assumed to be adiabatic. An adiabatic partition is oriented vertically with one edge on the enclosure floor. The dimensions and location of the partition were varied in order to investigate its effect of natural convection in the enclosure. Air was taken as the working fluid. Transport equations for vorticity and energy were solved using the QUICKEST scheme while the Poisson equation, for the steamfunction, was solved using the SOR method. For any Grashof number, temperature and flow fields in the region above the partition are not significantly different from those of the non-partitioned enclosure in the case of an aperture ratio of 0.75 or greater. An increase in the partition height or width results in modifying the temperature and flow fields and decreasing the average heat transfer across the enclosure.
