Jets, plumes and thermals are complex turbul ent structures, but their dynamical behavior can be modeled by a few relatively simple equat ions, in which a dimensionless factor or two can later be adjusted by laborat ory experimentation or field data.
We present a sequence of numerical experiments studying thermal plumes that arise from the basal thermal boundary layer in a spherical axisymmetric convecting fluid, reporting the geoid, topographic (swell), and heatflow anomalies.
Flow-field characteristics of the thermal plume above an elliptical ...
Jul 8, 2024 · In this paper, the effects of the ratio of long and short axes (5/4 ≤ ξ ≤ 5/1) and the intensity of heat source (80 ≤ F ≤ 160 W) on the axial and radial velocity distribution of thermal plume in an elliptical heat source are investigated by numerical simulation combined with experimental validation.
Plumes are bright quasi-radial rays between one and several Rs_ in coronal holes. They are observed during eclipses and, e.g., fi'om SOHO and SPARTAN-201. Using SOHO, DeForest et al. (1998) have finally unambiguously shown all plumes lie over photospheric magnetic flux concentrations, although not all flux concentrations have plumes. Modeling ...
Discussion of The structure of thermal plumes and
Jan 1, 2007 · We present a sequence of numerical experiments studying thermal plumes that arise from the basal thermal boundary layer in a spherical axisymmetric convecting fluid, reporting the geoid,...
Plume’s buoyancy and heat fluxes from the deep mantle …
Nov 1, 2012 · This paper investigated the depth-dependent plume’s buoyancy and heat fluxes from the deep mantle under varying plume viscosity and attempted to discuss the possibility of the weak thermal barrier for upwelling plumes at the 660-km boundary by instantaneous, global mantle flow calculations based on a recently published seismic tomography ...
Sheet-like and plume-like thermal flow in a spherical convection ...
We introduce, in spherical geometry, experiments on electro-hydrodynamic driven Rayleigh–Bénard convection that have been performed for both temperature-independent (‘GeoFlow I’) and temperature-dependent fluid viscosity properties (‘GeoFlow II’) with a measured viscosity contrast up to 1.5.
Sheet-like and plume-like thermal flow in a spherical convection ...
Nov 25, 2013 · The thermal drive produces a plume-like convective planform; the increase of it delivers merged patterns with 'connections' between the plumes. All patterns are snapshots of highly irregular...
Generation and Stability of Hotspots and Plumes in a Spherical …
Dec 1, 2005 · We investigate the influence of tectonic plate motions on plume generation in a 3-D spherical mantle convection model in which surface tectonic plates are dynamically coupled to the underlying...
Off-centre gravity induces large-scale flow patterns in spherical ...
Gastine et al. (2015) show that for Pr=1, sheet-like thermal plumes are formed near the inner and outer spheres, and these plumes undergo morphological changes into mushroom-like plumes when they eject from the boundary layers to the bulk.