The rate of mixing in semiconvective zones

Details The rate of mixing in semiconvective zones The rate of mixing in semiconvective zones

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...253..131s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 253, no. 1, Jan. 1992, p. 131-138.

Astronomy and Astrophysics

Astrophysics

52

Convection Cells, Mixing, Stellar Evolution, Supernova 1987A, Convective Heat Transfer, Diffusion Coefficient, Thermal Boundary Layer

Scientific paper

The present theory for mixing in semiconvective zones, under the assumption that the layered convection observed in similar laboratory circumstances occurs, takes into account the development of boundary layers with steep gradients in entropy and mean weight at the interface of adjacent layers. The most important property of the derived mixing rate is that it is proportional to the square root of the microscopic diffusion coefficient, reflecting the essential role played by both diffusion and advection of overturning cells in the transport mechanism. The diffusion coefficient depends only on the energy flux, the thermodynamic variables, and the chemical composition.

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