Author: George H. ChoueiriPublisher:
ISBN:
Category : Heat
Languages : en
Pages :
Book Description
An Experimental Study of Natural Convection in Vertical Open-ended Concentric and Eccentric Annuli
Author: George H. ChoueiriComputational Methods and Experimental Measurements XIII
Author: C. A. BrebbiaPublisher: WIT Press
ISBN: 1845640845
Category : Mathematics
Languages : en
Pages : 929
Book Description
Containing papers presented at the Thirteenth International Conference in this well established series on (CMEM) Computational Methods and Experimental Measurements. These proceedings review state-of-the-art developments on the interaction between numerical methods and experimental measurements.Featured topics include: Computational and Experimental Methods; Experimental and Computaqional Analysis; Computer Interaction and Control of Experiments; Direct, Indirect and In-Situ Measurements; Particle Methods; Structural and Stress Analysis; Structural Dynamics; Dynamics and Vibrations; Electrical and Electromagnetic Applications; Biomedical Applications; Heat Transfer; Thermal Processes; Fluid Flow; Data Acquisition; Remediation and Processing and Industrial Applications.
Natural Convection in Horizontal Eccentric Annuli
Author: Gary W. McNairPublisher:
ISBN:
Category :
Languages : en
Pages : 258
Book Description
In recent years there has been an increased emphasis being placed on the study of natural convection in various systems. The majority of studies have been concerned with concentric geometries. The studies oriented toward eccentric geometries have been very few and very specialized. The major emphasis of the studies have been the derivation of correlation equations used to describe the Nusselt numbers obtained in isothermal boundary systems. There is little reported research dealing with the problem of natural convection in an eccentric geometry subject to a free convection boundary. This study deals directly with a horizontal eccentric annuli geometry subject to the free convection outer boundary. A set of experimental measurements have been taken for various fluids and various eccentric geometries. The fluids included in this study include water, mercury, and glycerin. These fluids span a Rayleigh number range from approximately 25 to slightly in excess of 108. The results of these experiments have been correlated in a manner that allows the direct prediction of the maximum temperature distribution of the outer shell for the eccentric annular geometry. The only information required for the use of the equations may be obtained from the corresponding concentric geometry. The results of using the correlation equations to predict the temperature profiles occurring in the various experiments show a maximum deviation at any particular point of approximately 2.0% with an average deviation of approximately 0.5%. In addition the study investigates the feasibility of using a standard finite-difference code to calculate the observed temperature profiles. A sensitivity study is performed to determine the required accuracy of the heat transfer coefficients for the various surfaces to be input into the code.
An Experimental Study of Natural Convection Over Vertical Flat Plates in the Presence of Sublimation
Author: Robert Alan LachinApplied Mechanics Reviews
Author: An Experimental Study of Unsteady-state Natural Convection from Vertical Plates
Author: Jack Hershey MartinPublisher:
ISBN:
Category : Heat engineering
Languages : en
Pages : 228
Book Description
An Experimental and Numerical Investigation of Natural Convection in Open Ended Annuli and Its Application to the Cooling of an Aircraft Brake Assembly
Author: Chetan Prabhakar DesaiPublisher:
ISBN:
Category :
Languages : en
Pages : 606
Book Description
An Experimental Study of Vigorous Transient Natural Convection
Author: Joseph Charles MollendorfPublisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 126
Book Description
Natural Convection and Conduction in a Vertical Annulus with a Concentric Baffle
Author: Mark J. FishbaugherPublisher:
ISBN:
Category : Heat
Languages : en
Pages : 280
Book Description
Analytical and numerical study of steady-state laminar natural convection and conduction has been performed for an enclosure between concentric vertical cylinders. The inner and outer cylinders were isothermal, and the connecting top and bottom walls were adiabatic. A concentric baffle was included in the annulus, and the flow field and local heat transfer were investigated. The parameters of most interest in this study were the relative conductivity of the baffle and the properties of the fluid. A wide range of relative conductivities, Prandtl numbers, and Rayleigh numbers was investigated, assuming a particular cavity geometry with and without the baffle. The effect of a finite conductivity wall on the outside of the vertical annulus as well as the effect of high aspect ratio were also studied for low Prandtl number fluids (liquid metals). Results show that the relative conductivity of the concentric baffle affects the structure of the flow and the local Nusselt numbers. With increasing Rayleigh number, this effect diminishes. Multicellular flow is observed in each of the annular channels with increasing baffle conductivity ratio. A relatively low conductivity baffle promotes uniform channel flow in the annuli at lower Rayleigh numbers. The heat transfer results show that the baffle has an insulating effect at high Rayleigh numbers regardless of its conductivity. For the annulus with an outside wall of finite conductivity, results show that the relative conductivity of the wall is an important variable in determining the temperature of the rest of the domain. However, the conductivity of the outer wall had little effect on the structure of the flow field or the maximum velocities. For a higher aspect ratio cavity without an outside wall, the maximum velocities are higher while the overall heat transfer rates are found to be lower. This can be attributed to cavity geometry and the mechanisms for heat transfer above and below the baffle.
Author: Ramaswami Srinivasan