Natural Convection Heat Transfer Between Arrays of Horizontal Cylinders and Their Enclosure PDF Download
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Author: Robert Allen Weaver
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 150
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Author: Robert Allen Weaver
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 150
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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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: Christopher Eric Triplett
Publisher:
ISBN:
Category :
Languages : en
Pages : 438
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Author:
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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: Carol Elizabeth Stephens
Publisher:
ISBN:
Category : Cylinders
Languages : en
Pages : 254
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Author: Gordon Crupper
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 162
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Author: Van C. Au
Publisher:
ISBN:
Category :
Languages : en
Pages : 146
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Author: Thamir R. Al-Alusi
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 448
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Convection heat transfer was experimentally investigated for two different geometries. One case had three horizontal cylinders in a vertical plane placed between two vertical walls. The second case had three horizontal cylinders in a vertical plane with only one vertical wall. Several different cylinder center-tocenter spacings were investigated. The wall spacings for the two wall and single wall cases were also varied. The cylinders were placed in a still air medium at atmospheric pressure and were maintained at a constant heat flux. The modified Rayleigh number, based on the diameter of the cylinders, ranged from 6.2 x 104 to 1.2 x 106. A scale analysis was performed to predict the relationship between the Nusselt number and the modified Rayleigh number. A standard finite-difference code was employed to show the temperature distribution and velocity vectors distribution around the cylinders. The results showed that there was a maximum heat transfer from each cylinder at a specific wall-array spacing and a specific center-to-center spacing. Comparisons of heat transfer results with a single free cylinder and a free array of horizontal cylinders were made and discussed. Empirical equations were proposed to predict the effects of the experimental parameters on the heat transfer as expressed by the average Nusselt number of each cylinder or the average Nusselt number of the whole array. Flow visualization was accomplished using laser sheets. The resulting studies showed that the presence of a single wall or the asymmetrical placement of the array between the two walls eliminated the presence of the vortices in the spaces between the cylinders and displaced the stagnation points. The asymmetrical placement of the array between two walls created a reversed current between the two walls.
Author: Wei Liu
Publisher:
ISBN:
Category :
Languages : en
Pages : 726
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Author: Gad Hetsroni
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 648
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