scholarly journals Preferential concentration in the particle-induced convective instability

2020 ◽  
Vol 5 (11) ◽  
Author(s):  
Sara Nasab ◽  
Pascale Garaud
Keyword(s):  
Convective Instability ◽  
Preferential Concentration

Activated Prominences; Mechanisms for Activation and Eruption

1979 ◽  
Vol 44 ◽  
pp. 307-313
Author(s):  
D.S. Spicer
Keyword(s):  
Pressure Gradient ◽  
Density Gradient ◽  
Current Density ◽  
Convective Instability ◽  
Tearing Mode ◽  
Magnetic Shear ◽  
Long Wavelength ◽  
Ideal Mhd ◽  
Gradient Change ◽  
Accelerated Particles

A possible relationship between the hot prominence transition sheath, increased internal turbulent and/or helical motion prior to prominence eruption and the prominence eruption (“disparition brusque”) is discussed. The associated darkening of the filament or brightening of the prominence is interpreted as a change in the prominence’s internal pressure gradient which, if of the correct sign, can lead to short wavelength turbulent convection within the prominence. Associated with such a pressure gradient change may be the alteration of the current density gradient within the prominence. Such a change in the current density gradient may also be due to the relative motion of the neighbouring plages thereby increasing the magnetic shear within the prominence, i.e., steepening the current density gradient. Depending on the magnitude of the current density gradient, i.e., magnetic shear, disruption of the prominence can occur by either a long wavelength ideal MHD helical (“kink”) convective instability and/or a long wavelength resistive helical (“kink”) convective instability (tearing mode). The long wavelength ideal MHD helical instability will lead to helical rotation and thus unwinding due to diamagnetic effects and plasma ejections due to convection. The long wavelength resistive helical instability will lead to both unwinding and plasma ejections, but also to accelerated plasma flow, long wavelength magnetic field filamentation, accelerated particles and long wavelength heating internal to the prominence.

The absolute and convective instability of the magnetospheric flanks

2000 ◽  
Vol 105 (A1) ◽  
pp. 385-394
Author(s):  
Andrew N. Wright
Keyword(s):  
Convective Instability ◽  
The Absolute

CONVECTIVE INSTABILITY IN CRYSTAL GROWTH SYSTEM

2002 ◽  
Vol 12 (12) ◽  
pp. 187-221 ◽  
Author(s):  
Koichi Kakimoto ◽  
Nobuyuki Imaishi
Keyword(s):  
Crystal Growth ◽  
Convective Instability ◽  
Growth System

ABSOLUTE AND CONVECTIVE INSTABILITY OF A CONFINED SWIRLING ANNULAR LIQUID LAYER

2014 ◽  
Vol 24 (7) ◽  
pp. 555-573 ◽  
Author(s):  
Qing-Fei Fu ◽  
Li-Jun Yang ◽  
Ming-xi Tong ◽  
Chen Wang
Keyword(s):  
Liquid Layer ◽  
Convective Instability

The effects of Coriolis force and radial stretch on the convective instability characteristics of the Bödewadt flow

2021 ◽  
pp. 095440622110071
Author(s):  
Dip Mukherjee ◽  
Bikash Sahoo
Keyword(s):  
Boundary Layer ◽  
Coriolis Force ◽  
Boundary Layer Flow ◽  
Convective Instability ◽  
Type I ◽  
Similarity Transformations ◽  
Instability Modes ◽  
Neutral Curves ◽  
Lower Disk ◽  
Layer Flow

The Bödewadt boundary-layer flow is induced by the rotation of a viscous fluid rotating with a constant angular velocity over a stationary disk. In this paper, the Bödewadt boundary-layer flow has been studied in the presence of the Coriolis force to observe the effect of radial stretch of the lower disk on the flow. For the first time in the literature, a numerical investigation of the effects of both stretching mechanism and the Coriolis force on the flow behaviour and on the convective instability characteristics of the above flow has been carried out. In this paper, the Kármán similarity transformations have been considered in order to convert the system of PDEs representing the momentum equations of the flow into a system of highly non-linear coupled ODEs and solved numerically to obtain the velocity profiles of the Bödewadt flow. Then, a convective instability analysis has been performed by using the Chebyshev collocation method in order to obtain the neutral curves. From the neutral curves it is observed that radial stretch has a globally stabilising effect on both the inviscid Type-I and the viscous Type-II instability modes. This underlying physical phenomena has been verified by performing an energy analysis of the flow. The results obtained excellently supports the previous works and will be prominently treated as a benchmark for our future studies.

Convective Instability in a Fluid Mixture Heated from Above

1998 ◽  
Vol 80 (17) ◽  
pp. 3759-3762 ◽  
Author(s):  
A. La Porta ◽  
C. M. Surko
Keyword(s):  
Convective Instability ◽  
Fluid Mixture

scholarly journals Long wavelength limit of the current convective instability

1984 ◽  
Vol 89 (A5) ◽  
pp. 2931 ◽  
Author(s):  
J. D. Huba
Keyword(s):  
Convective Instability ◽  
Long Wavelength ◽  
Wavelength Limit

Thermosolutal-convective instability in a stellar atmosphere

1987 ◽  
Vol 8 (4) ◽  
pp. 305-314 ◽  
Author(s):  
R. C. Sharma ◽  
Bakshis Singh
Keyword(s):  
Convective Instability ◽  
Stellar Atmosphere
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