Effect of a radial barrier on the convective flow in a rotating fluid annulus

Bowden, Mary; Eden, H. F.

doi:10.1029/jb073i022p06887

Cited by 8 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Consistent with Hide's proposal, Bowden and Eden (1968) observed systematic azimuthal temperature gradients which increased in magnitude with increasing R, and they noticed the formation of horizontal eddies at the highest values of R used in their experiment. In the present paper we extend these studies with the objective of elucidating the mechanisms at work; particularly the role of the horizontal eddies.…”

Section: Introductionsupporting

confidence: 83%

“…Theoretical considerations along the lines presented above were first used in the interpretation of observed flow patterns and heat transfer determinations in experiments with the annular system without a radial barrier (Hide, 1958). They also provided the qualitative basis of my hypothesis that the insertion of a radial barrier would increase advective heat transfer, possibly to the level corresponding to R = 0, in favour of which there is now ample evidence (Bowden, 1961;Bowden and Eden, 1968;Rayer, 1992 and the main body of this paper) from experiments carried out in my laboratory. The range of 0 over which heat transfer is found to be the same as for R = 0, is so large that it cannot be accounted for without invoking, in addition to a circulation in meridional planes, a motion uh with horizontal components, seen in the experiments, which must make an increasing contribution to the heat transfer H as 0 increases (see Fig.…”

Section: 3) Dumentioning

confidence: 96%

“…The conjecture was investigated and confumed in work by Bowden (1961), using apparatus designed specifically for heat transfer measurements. Other work included studies of the influence of full and partial barriers on flow patterns and on the broad characteristics of the temperature field in the convecting fluid (Bowden and Eden, 1968;Bless, 1965;Rayer, 1992). Temperature measurements are particularly important, for they provide inter a h information about the pressure field (see Appendix) which in the laboratory studies cannot readily be determined by direct measurements.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal convection in a rotating fluid annulus blocked by a radial barrier

Rayer

Johnson

Hide

1998

Geophysical & Astrophysical Fluid Dynamics

View full text Add to dashboard Cite

There have been extensive previous laboratory studies of thermal convection in a vertical cylindrical annulus of fluid that rotates about its axis with angular velocity fl (say) with respect to an inertial frame and is subject to an axisymmetric horizontal temperature gradient, as well as associated theoretical and numerical work. The relative flow produced by concomitant buoyancy forces is strongly influenced by Coriolis forces, which give rise to azimuthal circulations and promote, through the process of "baroclinic instability", regimes of non-axisymmetric sloping convection which can be spatially and temporally regular or irregular ("chaotic geostrophic turbulence"). It is also known from previous work that such flows are changed dramatically by the presence of a thin rigid impermeable radial barrier blocking the crosi-section of the annulus, and capable of supporting a net azimuthal pressure gradient and associated net azimuthal temperature gradient within the fluid. The presence of the barrier can thus render convective heat transport across the fluid annulus (as measured by the Nusselt number, Nu) virtually independent of (as measured by the so-called Ekman or Taylor number) and dependent only on the Grashof number, G. The present study reports further systematic determinations of heat transport and of velocity and temperature fields in the presence of a radial barrier, with emphasis on the a-dependence of the crucially-important net azimuthal temperature gradient supported by the barrier and the physical interpretation of that dependence.

show abstract

Section: Introductionsupporting

confidence: 83%

Section: 3) Dumentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal convection in a rotating fluid annulus blocked by a radial barrier

Rayer

Johnson

Hide

1998

Geophysical & Astrophysical Fluid Dynamics

View full text Add to dashboard Cite

show abstract

“…One of the striking results from experiments with a radial barrier is a rather stable positive radial heat flux that is independent of the annulus' rotation. In contrast, for zonally symmetric annuli, the radial heat flux is reduced with faster rotation (Bowden and Eden 1968;Rayer et al 1998).…”

Section: Introductionmentioning

confidence: 83%

“…From the papers by Bowden and Eden (1968) and Rayer et al (1998), we know that the total heat flux is strongly influenced when the azimuthal flow is completely blocked. In that case, a large part of the heat flux can be accomplished by the mean flow that follows the barrier in the radial direction.…”

Section: Eddy Heat Fluxmentioning

confidence: 99%

Simultaneous PIV and thermography measurements of partially blocked flow in a differentially heated rotating annulus

et al. 2011

View full text Add to dashboard Cite

A radial barrier has been mounted in a differentially heated rotating annulus that partially blocks the azimuthal flow component. The experiment can be seen as an analog to geophysical flows with constrictions, e.g., the Antarctic Circumpolar Current. However, the experiment has been carried out without a particular natural flow in mind. The main interest was to observe a baroclinic annulus flow that does not become saturated. Hence, in contrast to the annulus flow without a barrier, the partially blocked flow remains transient and surface heat fluxes associated with baroclinic life cycles can be studied. The annulus can be subdivided into the upstream half of the barrier, where waves amplify, and the downstream half of the barrier, where waves decay. In the upstream half, the azimuthal mean flow is moderate but with a significant positive eddy radial heat flux. In the downstream half, we find a strong jet in the mean azimuthal flow and furthermore an increased radial mean temperature gradient. The latter points to a weakened or even reversed radial eddy heat flux in the lee side of the barrier. Temperature anomalies appear as large bulges in the outer part of the annulus. Moreover, an outward shift of vortex centers can be observed with respect to centers of temperature anomalies. This phase shift between pressure and temperature anomalies differs from that of classical Eady modes of baroclinic instability.

show abstract

Orthogonal Decomposition Methods to Analyze PIV, LDV, and Thermography Data of Thermally Driven Rotating Annulus Laboratory Experiments

Harlander

Larcher

Wright

et al. 2014

Modeling Atmospheric and Oceanic Flows

View full text Add to dashboard Cite

Already in the 1950s, an elegant laboratory experiment had been designed to understand how the atmospheric circulation transports heat from equatorial to polar latitudes (cf. the pioneering studies described by Hide [1958, 2010]). It consists of a cooled inner and heated outer cylinder mounted on a rotating platform, mimicking the heated tropical and cooled polar regions of Earth's atmosphere. Depending on the strength of the heating and the rate of rotation, different flow regimes had been identified in the gap: the zonal flow regime, wave regimes that can be classified by propagating waves of different wave numbers, and quasi-chaotic regimes where waves and small-scale vortices coexist. The baroclinic annulus experiment, often called the differentially heated rotating annulus of fluid, has been accepted as a suitable laboratory model for the midlatitude large-scale flow in Earth's atmosphere. For example, Fultz [1961] and Lorenz [1964] used the heated rotating annulus as an analogy to the complex dynamics of the large-scale weather when they discussed problems related to climate variability. Obviously, large-scale environmental flows and the flows observed in the rotating annulus show agreement

show abstract

Effect of a radial barrier on the convective flow in a rotating fluid annulus

Cited by 8 publications

References 5 publications

Thermal convection in a rotating fluid annulus blocked by a radial barrier

Thermal convection in a rotating fluid annulus blocked by a radial barrier

Simultaneous PIV and thermography measurements of partially blocked flow in a differentially heated rotating annulus

Orthogonal Decomposition Methods to Analyze PIV, LDV, and Thermography Data of Thermally Driven Rotating Annulus Laboratory Experiments

Contact Info

Product

Resources

About