Author: Yee LeePublisher:
ISBN:
Category : Heat
Languages : en
Pages : 258
Book Description
Numerical Study of Multicellular Natural Convection in Vertical Cavities
Author: Yee LeeExperimental and Numerical Study of Natural Convection in Tall Cavities
Author: N. Z. InceA Numerical Study of Natural Convection in Upward Facing Open Cavities
Author: Rodney C. SchmidtPublisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 300
Book Description
Scientific and Technical Aerospace Reports
Author: Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 976
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
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.
A Numerical Study of Natural Convection in an Open Cavity
Author: V. VenkatakrishnanPublisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 128
Book Description
NATURAL CONVECTION IN CAVITIES WITH INTERNAL FINS
Author: SANKAR GANESH SUBRAMANIANPublisher: LAP Lambert Academic Publishing
ISBN: 9783843363440
Category :
Languages : en
Pages : 56
Book Description
A numerical study has been carried out in differentially heated square cavities, which are formed by horizontal adiabatic walls and vertical isothermal walls. Three cases such as Natural convection in a cavity without any fins, with one fin and with two fins each placed equidistant from the center on the hot wall have been considered. Heat transfer by natural convection is studied by numerically solving equations of continuity, momentum and energy. A parametric study is carried out using the following parameters: Rayleigh number from 104 to 107, Prandtl number of 0.729, internal fin length of 0.10 m. A total of 24 cases have been considered and plotted using Fluent.
Multicellular Natural Convection in a Narrow Vertical Slot
Author: David C. JarmanPublisher:
ISBN:
Category :
Languages : en
Pages : 153
Book Description
The purpose of this thesis is to investigate the influence of Prandtl number on steady, or unsteady, flow behavior in a narrow vertical slot. The focus is to examine the effects of Prandtl number on natural convective flows, and the formation of single and multiple cells, over a range of Prandtl numbers from Pr = 0 to Pr = infinity. Both numerical as well as analytical approaches are undertaken in studying these phenomena. By assuming a large Rayleigh number and small gap, the two-dimensional Navier-Stokes equations are reduced to the simpler boundary-layer form. Boundary-layer equations are then derived for both the low (Pr or = 0.1) and high (Pr or = 10) Prandtl number regimes, including the limiting conditions of Pr approaches limit of 0 and Pr approaches limit of infinity. Furthermore, the equations obtained for the low Prandtl number regime also hold any finite Prandtl number in the range 0
Author: 
Author: C. E. Hickox