The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Detlef Quadfasel - One of the best experts on this subject based on the ideXlab platform.
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Convection and deep water formation in the arctic ocean greenland sea system
Journal of Marine Systems, 1991Co-Authors: Bert Rudels, Detlef QuadfaselAbstract:Abstract The processes of Convection and deep water formation in the Nordic Seas are reviewed. In the Arctic Ocean the formation of deep water results from brine release due to freezing, which increases the density of the shelf waters. The dense shelf waters sink on the continental slopes into the deep basins entraining ambient waters from the strongly stratified Arctic Ocean proper. In the European Polar Seas—the Nordic Seas—deep water is only formed in the Greenland Sea through haline Convection, resulting in a weakly stratified water column. The exchanges through Fram Strait, the deep connection between the Arctic Ocean and the Nordic Seas are used to quantify the average rate of deep water formation. The net deep outflow from the Arctic Ocean corresponds to the production of Arctic Ocean Deep Water. By considering the total deep outflow and mixing ratios derived from θ-S characteristics of the different basins the formation rate of Greenland Sea Deep Water may by inferred. Both sources provide about 0.5 Sv making the arctic contribution to the World Ocean deep waters at least 1 Sv.
Alexander E Labovsky - One of the best experts on this subject based on the ideXlab platform.
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numerical analysis of a method for high peclet number transport in porous media
Journal of Mathematical Analysis and Applications, 2009Co-Authors: N Heitmann, Alexander E LabovskyAbstract:Abstract A variationally consistent eddy viscosity discretization is presented in [W.J. Layton, A connection between subgrid scale eddy viscosity and mixed methods, Appl. Math. Comput. 133 (2002) 147–157] for the stationary Convection diffusion problem. This discretization is extended to the evolutionary problem in [N. Heitmann, Subgridscale stabilization of time-dependent Convection dominated diffusive transport, J. Math. Anal. Appl. 331 (2007) 38–50] with a near optimal error bound. In the following, we couple this discretization with the porous media problem. We present a comprehensive analysis of stability and error for the velocity field derived from the porous media problem. Next, using a backward Euler approximation for the time derivative we follow the inherited error in velocity through the coupling with the Convection diffusion problem. The method is shown to be stable and the error near optimal and independent of the diffusion coefficient, ϵ.
Adrian Bejan - One of the best experts on this subject based on the ideXlab platform.
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Convection Heat Transfer, Fourth Edition - Convection with Change of Phase
Convection in Porous Media, 2013Co-Authors: Donald A. Nield, Adrian BejanAbstract:In the examples of forced and natural Convection discussed until now, the fluid that flowed through the pores did not experience a change of phase, no matter how intense the heating or cooling effect. In the present chapter we turn our attention to situations in which a change of phase occurs, for example, melting or evaporation upon heating, and solidification or condensation upon cooling. These Convection problems constitute a relatively new area in the field of Convection in porous media.
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Convection heat transfer
1995Co-Authors: Adrian BejanAbstract:As we consider simultaneous fluid flow and heat transfer in porous media, the role of the macroscopic (Darcean) and microscopic (pore-level) velocity fields on the temperature field needs to be examined. Experiments have shown that the mere inclusion of u D · ∇ 〈T〉 in the energy equation does not satisfactorily account for all the hydrodynamic effects. The pore-level hydrodynamics also influence the temperature field. Inclusion of the effect of the pore-level velocity nonuniformity on the temperature distribution (called the dispersion effect and generally included in the diffusion transport) is the main concern in this chapter.
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Convection in Porous Media
1992Co-Authors: Donald A. Nield, Adrian BejanAbstract:Preface - Mechanics of Fluid Flow Through a Porous Medium.- Heat Transfer Through a Porous Medium.- Mass Transfer Through a Porous Medium Multicomponent and Multiphase Flows.- Forced Convection.- External Natural Convection.- Internal Natural Convection: Heating From Below.- Internal Natural Convection: Heating from the Side.- Mixed Convection.- Double Diffusive Convection.- Convection with Change of Phase.- Geophysical Aspects.- References.
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Convection in porous media
1992Co-Authors: D A Nield, Adrian BejanAbstract:This introduction to Convection in porous media assumes the reader is familiar with basic fluid mechanics and heat transfer, going on to cover insulation of buildings, energy storage and recovery, geothermal reservoirs, nuclear waste disposal, chemical reactor engineering and the storage of heat-generating materials like grain and coal. Geophysical applications range from the flow of groundwater around hot intrusions to the stability of snow against avalanches. The book is intended to be used as a reference, a tutorial work or a textbook for graduates.
Joseph B Klemp - One of the best experts on this subject based on the ideXlab platform.
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three dimensional evolution of simulated long lived squall lines
Journal of the Atmospheric Sciences, 1994Co-Authors: William C Skamarock, Morris L Weisman, Joseph B KlempAbstract:Abstract Simulations of squall lines, using nonhydrostatic Convection-resolving models, have been limited to two dimensions or three dimensions with the assumption of along-line periodicity. The authors present 3D nonhydrostatic Convection-resolving simulations, produced using an adaptive grid model, where the lines are finite in length and the restriction to along-line periodicity is removed. The base state for the simulations is characterized by weak, shallow shear and high convective available potential energy (CAPE), an environment in which longlived midlatitude mesoscale convective systems (MCSs) are observed. The simulated systems bear strong resemblance to many observed systems, suggesting that large-scale forcing, absent in the horizontally homogeneous environment, is not needed to produce many of the distinguishing features of midlatitude MCSs. In simulations without Coriolis forcing, the presence of line ends leads to mature symmetric systems characterized by a central region of strong convectio...
Bert Rudels - One of the best experts on this subject based on the ideXlab platform.
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Convection and deep water formation in the arctic ocean greenland sea system
Journal of Marine Systems, 1991Co-Authors: Bert Rudels, Detlef QuadfaselAbstract:Abstract The processes of Convection and deep water formation in the Nordic Seas are reviewed. In the Arctic Ocean the formation of deep water results from brine release due to freezing, which increases the density of the shelf waters. The dense shelf waters sink on the continental slopes into the deep basins entraining ambient waters from the strongly stratified Arctic Ocean proper. In the European Polar Seas—the Nordic Seas—deep water is only formed in the Greenland Sea through haline Convection, resulting in a weakly stratified water column. The exchanges through Fram Strait, the deep connection between the Arctic Ocean and the Nordic Seas are used to quantify the average rate of deep water formation. The net deep outflow from the Arctic Ocean corresponds to the production of Arctic Ocean Deep Water. By considering the total deep outflow and mixing ratios derived from θ-S characteristics of the different basins the formation rate of Greenland Sea Deep Water may by inferred. Both sources provide about 0.5 Sv making the arctic contribution to the World Ocean deep waters at least 1 Sv.