Arrays of Heated Horizontal Cylinders in Natural Convection PDF Download
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Author: G. F. Marsters
Publisher:
ISBN:
Category : Cylinders
Languages : en
Pages : 80
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Book Description
Author: G. F. Marsters
Publisher:
ISBN:
Category : Cylinders
Languages : en
Pages : 80
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The natural convection heat transfer between arrays of horizontal, heated cylinders and their isothermal, cooled enclosure was experimentally investigated. Four different cylinder arrays were used: two in-line and two staggered. Four fluids (air, water, 20 cs silicone, and 96% glycerine) were used with Prandtl numbers ranging from 0.705 to 13090.0. There was no significant change in the Nusselt number between isothermal and constant heat flux conditions of the cylinder arrays. The average heat transfer coefficient was most affected by the spacing between cylinders and the total surface area of the cylinder arrays. The enclosure reduced the expected increase in both the average and the local heat transfer coefficients caused by changing the inner body from an in-line arrangement to a staggered arrangement of comparable spacing. An increase in fluid viscosity reduced the influence of the geometric effects.
Author: Carol Elizabeth Stephens
Publisher:
ISBN:
Category : Cylinders
Languages : en
Pages : 254
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Author: Robert Allen Weaver
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 150
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Author: Christopher Eric Triplett
Publisher:
ISBN:
Category :
Languages : en
Pages : 438
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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This thesis presents the results of an experimental investigation of natural convection heat transfer in a staggered array of heated cylinders, oriented horizontally within a rectangular enclosure. The main purpose of this research was to extend the knowledge of heat transfer within enclosed bundles of spent nuclear fuel rods sealed within a shipping or storage container. This research extends Canaan's investigation of an aligned array of heated cylinders that thermally simulated a boiling water reactor (BWR) spent fuel assembly sealed within a shipping or storage cask. The results are presented in terms of piecewise Nusselt-Rayleigh number correlations of the form Nu = C(Ra)[sup n], where C and n are constants. Correlations are presented both for individual rods within the array and for the array as a whole. The correlations are based only on the convective component of the heat transfer. The radiative component was calculated with a finite-element code that used measured surface temperatures, rod array geometry, and measured surface emissivities as inputs. The correlation results are compared to Canaan's aligned array results and to other studies of natural convection in horizontal tube arrays.
Author: Thomas H. Kuehn
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 290
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Author: Van C. Au
Publisher:
ISBN:
Category :
Languages : en
Pages : 146
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Author:
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 47
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Author: Deing Wang
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 140
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Book Description
An experimental investigation was conducted to better understand the heat transfer process with natural convection from an array of uniformly heated horizontal cylinders to mercury. Five assembly geometries were studied, these being the single horizontal cylinder, two cylinders with spacing ratios S/D = 2,3 and 4, (S represents the center-to-center spacing between cylinders of diameter, D), and three cylinders with a single spacing ratio of S/D = 2. All cylinders were arranged in the same vertical plane. A scale analysis was employed to predict the relationship between the average Nusselt number and the Boussinesq number. In the case of the single cylinder good agreement was achieved between scale analysis and experimental results. The Nusselt number is a function of Boussinesq number only in the single cylinder case. These findings were extended to cases with two and three cylinders. Correlations of Nusselt number with different Boussinesq numbers, various ratios of spacing and diameters of cylinders have been established for these multiple cylinder cases.
