Traveling plumes generated within a double-diffusive interface between counter shear flows

2000 ◽  
Vol 12 (11) ◽  
pp. 3078 ◽  
Author(s):  
Tatsuo Nishimura ◽  
Soshun Sakura ◽  
Kuniaki Gotoh ◽  
Alexandru M. Morega
Keyword(s):  
Shear Flows ◽  
Diffusive Interface ◽  
Double Diffusive

scholarly journals Simulations of a double-diffusive interface in the diffusive convection regime

2012 ◽  
Vol 711 ◽  
pp. 411-436 ◽  
Author(s):  
J. R. Carpenter ◽  
T. Sommer ◽  
A. Wüest
Keyword(s):  
Boundary Layer ◽  
Boundary Layers ◽  
Molecular Diffusion ◽  
Layer Structure ◽  
Previous Theory ◽  
Convection Regime ◽  
Graphic Interface ◽  
Diffusive Convection ◽  
Diffusive Interface ◽  
Double Diffusive

AbstractThree-dimensional direct numerical simulations are performed that give us an in-depth account of the evolution and structure of the double-diffusive interface. We examine the diffusive convection regime, which, in the oceanographically relevant case, consists of relatively cold fresh water above warm salty water. A ‘double-boundary-layer’ structure is found in all of the simulations, in which the temperature ($T$) interface has a greater thickness than the salinity ($S$) interface. Therefore, thin gravitationally unstable boundary layers are maintained at the edges of the diffusive interface. The $TS$-interface thickness ratio is found to scale with the diffusivity ratio in a consistent manner once the shear across the boundary layers is accounted for. The turbulence present in the mixed layers is not able to penetrate the stable stratification of the interface core, and the $TS$-fluxes through the core are given by their molecular diffusion values. Interface growth in time is found to be determined by molecular diffusion of the $S$-interface, in agreement with a previous theory. The stability of the boundary layers is also considered, where we find boundary layer Rayleigh numbers that are an order of magnitude lower than previously assumed.

scholarly journals A double-diffusive interface tank for dynamic-response studies

2005 ◽  
Vol 63 (1) ◽  
pp. 263-289 ◽  
Author(s):  
Raymond W. Schmitt ◽  
Robert C. Millard ◽  
John M. Toole ◽  
W. David Wellwood
Keyword(s):  
Dynamic Response ◽  
Diffusive Interface ◽  
Double Diffusive

Experimental Study on Double-Diffusive Convection During Solidification of NH4Cl-H2O Hypereutectic Solution in Cylinder Cavity

2008 ◽  
Author(s):  
Bofeng Bai ◽  
Jun Lu ◽  
Lei Zhang ◽  
Heng Li
Keyword(s):  
Experimental Study ◽  
Cylindrical Cavity ◽  
Particle Image ◽  
Solidification Process ◽  
Double Diffusive Convection ◽  
Diffusive Convection ◽  
Image Velocimetry ◽  
Diffusive Interface ◽  
Contrary Direction ◽  
Double Diffusive

In order to reveal the law of double-diffusive convection of multi-compound solution in cylindrical cavity, experimental study on solidification of NH4Cl-H2O hypereutectic solution has been performed by using particle image velocimetry (PIV). The influencing factors of flow patterns and intensity are also analyzed. The results show that: 1) There are two approximately symmetric main convection cells in the liquid which are down along the sidewall and up along the center of the cylindrical cavity. Meanwhile, there are also two secondary cells on the bottom corner of cylindrical cavity, which flow in contrary direction to that of the main ones; 2) Due to the release of water during the solidification process, solute layers and diffusive interface are developed in the liquid and will be disappeared in the end; 3) The cooling temperature and the initial concentration have significantly effects on the flow velocity, solute layers and diffusive interface.

The structure of a double-diffusive interface in a laterally heated enclosure

2005 ◽  
Vol 48 (23-24) ◽  
pp. 4926-4941 ◽  
Author(s):  
J. Tanny ◽  
R. Dviri ◽  
A. Svizher ◽  
J. Cohen
Keyword(s):  
Diffusive Interface ◽  
Double Diffusive
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