A Numerical Study of Steady Turbulent Forced Convection Heat Transfer in a Spherical Annulus Heat Exchanger PDF Download
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Author: Werner Stein
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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Author: Werner Stein
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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Author: Dean Byard Tuft
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Category :
Languages : en
Pages : 242
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Author:
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Category :
Languages : en
Pages :
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Calculations of steady laminar incompressible fluid-flow and heat transfer in a spherical annulus are presented. Steady pressures, temperatures, velocities, and heat transfer coefficients are calculated for an insulated outer sphere and a 0°C isothermal inner sphere with 50°C heated water flowing in the annulus. The inner sphere radius is 13.97 cm, the outer sphere radius is 16.83 cm and the radius ratio is 1.2. The transient axisymmetric equations of heat, mass, and momentum conservation are solved numerically in spherical coordinates. The transient solution is carried out in time until steady state is achieved. A variable mesh is used to improve resolution near the inner sphere where temperature and velocity gradients are steep. It is believed that this is the first fully two-dimensional analysis of forced flow in a spherical annulus. Local and bulk Nusselt numbers are presented for Reynolds numbers from 4.4 to 440. Computed bulk Nusselt numbers ranged from 2 to 50 and are compared to experimental results from the literature. Inlet flow jetting off the inner sphere and flow separation are predicted by the analysis. The location of wall jet separation was found to be a function of Reynolds number, indicating the location of separation depends upon the ratio of inertia to viscous forces. Wall jet separation has a pronounced effect on the distribution of local heat flux. The area between inlet and separation was found to be the most significant area for heat transfer. Radial distributions of azimuthal velocity and temperature are presented for various angles beginning at the inlet. Inner sphere pressure distribution is presented and the effect on flow separation is discussed.
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Category : Power resources
Languages : en
Pages : 740
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Author:
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Category : Power resources
Languages : en
Pages : 888
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Author: Yan Su
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Category :
Languages : en
Pages : 286
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Author:
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Category : Heat
Languages : en
Pages : 504
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Author: Sadık Kakaç
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 616
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Category : Aeronautics
Languages : en
Pages : 968
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Author: D.A. Nield
Publisher: Springer Science & Business Media
ISBN: 0387334319
Category : Technology & Engineering
Languages : en
Pages : 655
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Book Description
This new edition includes nearly 1000 new references.
