Laminar Natural Convection on a Vertical Surface with Discrete Roughness PDF Download
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Author: Said Shakerin
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 262
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Book Description
Author: Said Shakerin
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 262
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Said Shakerin
Publisher:
ISBN:
Category : Dwellings
Languages : en
Pages : 9
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Book Description
Natural convection flow next to a heated wall with single and repeated, two-dimensional, rectangular roughness elements is studied numerically and experimentally. The objective is to determine how these roughness elements influence heat transfer rates from the wall. Each roughness element consists of a thermally conducting, horizontal cylinder of rectangular cross section attached to the heated, isothermal wall of an enclosure. The height of roughness is on the order of the boundary layer thickness. Dye flow visualization in water confirms the numerical prediction that the steady flow over these elements does not separate. Only at high Rayleigh numbers, when the boundary layer below the roughness is unsteady, is local instantaneous flow reversal observed. Although steady flow reversals near the wall are not predicted or observed, nearly stagnant regions are formed, particularly between closely spaced cylinders. The surface heat flux in these stagnant regions is relatively low, so the total heat transfer rate may be nearly the same as for a smooth wall in spite of the increased surface area.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Natural convection flow next to a heated wall with single and repeated, two-dimensional, rectangular roughness elements is studied numerically and experimentally. The objective is to determine how these roughness elements influence heat transfer rates from the wall. Each roughness element consists of a thermally conducting, horizontal cylinder of rectangular cross section attached to the heated, isothermal wall of an enclosure. The height of roughness is on the order of the boundary layer thickness. Dye flow visualization in water confirms the numerical prediction that the steady flow over these elements does not separate. Only at high Rayleigh numbers, when the boundary layer below the roughness is unsteady, is local instantaneous flow reversal observed. Although steady flow reversals near the wall are not predicted or observed, nearly stagnant regions are formed, particularly between closely spaced cylinders. The surface heat flux in these stagnant regions is relatively low, so the total heat transfer rate may be nearly the same as for a smooth wall in spite of the increased surface area.
Author: Ephraim M. Sparrow
Publisher:
ISBN:
Category : Equations
Languages : en
Pages : 744
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Book Description
All the aforementioned results are given for fluids having Prandtl numbers in the range 0.01 to 1000.
Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 528
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Author:
Publisher:
ISBN:
Category : Heat engineering
Languages : en
Pages : 678
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Author:
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 692
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Author: Wei Cha
Publisher:
ISBN:
Category : Electronic apparatus and appliances
Languages : en
Pages : 196
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Author: American Society of Mechanical Engineers. Winter Annual Meeting
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 170
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