Contaminant and sediment transport by advection and diffusion

2015 ◽  
pp. 209-266
Keyword(s):  
Sediment Transport ◽  
And Diffusion

scholarly journals Stability of two-dimensional sediment flow down an inclined plane

1992 ◽  
Vol 14 (1) ◽  
pp. 10-16
Author(s):  
Nguyen Van Diep ◽  
Dang Huu Chung
Keyword(s):  
Free Surface ◽  
Sediment Transport ◽  
Boundary Conditions ◽  
Diffusion Theory ◽  
Diffusion Flux ◽  
Neutral Curve ◽  
Two Dimensional ◽  
Inclined Plane ◽  
Sediment Flow ◽  
And Diffusion

In this paper the authors have studied the instability of 2-D flow with sediment transport, which is based on the generalized diffusion theory. The authors have constructed the boundary conditions of the bed concentration and diffusion flux at the free surface for dosing equations system. After that the authors have considered the instability and obtained the neutral-curve of stability in the plane (R1 k). The obtained results show that if there is no suspended sediment, the result will be identical to Chia-Shun Yih's.

Meridional Circulation, Turbulence, and Diffusion Processes in Stars

1976 ◽  
Vol 32 ◽  
pp. 109-116 ◽  
Author(s):  
S. Vauclair
Keyword(s):  
Convection Zone ◽  
Diffusion Processes ◽  
Meridional Circulation ◽  
Diffusion Time ◽  
Work In Progress ◽  
First Results ◽  
Stellar Envelopes ◽  
And Diffusion ◽  
Turbulence And Diffusion ◽  
Hr Diagram

This paper gives the first results of a work in progress, in collaboration with G. Michaud and G. Vauclair. It is a first attempt to compute the effects of meridional circulation and turbulence on diffusion processes in stellar envelopes. Computations have been made for a 2 Mʘstar, which lies in the Am - δ Scuti region of the HR diagram.Let us recall that in Am stars diffusion cannot occur between the two outer convection zones, contrary to what was assumed by Watson (1970, 1971) and Smith (1971), since they are linked by overshooting (Latour, 1972; Toomre et al., 1975). But diffusion may occur at the bottom of the second convection zone. According to Vauclair et al. (1974), the second convection zone, due to He II ionization, disappears after a time equal to the helium diffusion time, and then diffusion may happen at the bottom of the first convection zone, so that the arguments by Watson and Smith are preserved.

Ordering and diffusion in II-VI/III-VI alloys with structural vacancies

1997 ◽  
Vol 101-103 (1-2) ◽  
pp. 479-487
Author(s):  
H v. Wensierski
Keyword(s):  
And Diffusion
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