Tracer diffusivity of Si31 in CaO-SiO2 melts at 1600°C

1979 ◽  
Vol 10 (4) ◽  
pp. 551-554 ◽  
Author(s):  
Helmut Keller ◽  
Klaus Schwerdtfeger
Keyword(s):  
Tracer Diffusivity

Relation between carbon tracer diffusivity and carbon activity coefficient in austenitic NiFeCr alloys

1993 ◽  
Vol 29 (12) ◽  
pp. 1581-1585 ◽  
Author(s):  
J. C̆ermák ◽  
J. Sopoušek ◽  
K. Stránský
Keyword(s):  
Activity Coefficient ◽  
Carbon Activity ◽  
Tracer Diffusivity

Is the Reduction in Tracer Diffusivity under Nanoscopic Confinement Related to a Frustrated Segmental Mobility?

2011 ◽  
Vol 32 (11) ◽  
pp. 844-848 ◽  
Author(s):  
Simone Napolitano ◽  
Cinzia Rotella ◽  
Michael Wübbenhorst
Keyword(s):  
Tracer Diffusivity ◽  
Segmental Mobility

scholarly journals Enhancing tracer diffusivity by tuning interparticle interactions and coordination shell structure

Soft Matter ◽  
2012 ◽  
Vol 8 (15) ◽  
pp. 4083-4089 ◽  
Author(s):  
James Carmer ◽  
Gaurav Goel ◽  
Mark J. Pond ◽  
Jeffrey R. Errington ◽  
Thomas M. Truskett
Keyword(s):  
Shell Structure ◽  
Coordination Shell ◽  
Tracer Diffusivity ◽  
Interparticle Interactions

Tracer diffusivity of Ca45and electrical conductivity in CaO-SiO2 melts

1979 ◽  
Vol 10 (1) ◽  
pp. 67-70 ◽  
Author(s):  
Helmut Keller ◽  
Klaus Schwerdtfeger ◽  
Klaus Hennesen
Keyword(s):  
Electrical Conductivity ◽  
Tracer Diffusivity

Lagrangian diffusivity estimated from coherent mesoscale eddies in an idealized basin circulation model

2021 ◽  
Author(s):  
Wenda Zhang ◽  
Christopher Wolfe
Keyword(s):  
General Circulation ◽  
Circulation Model ◽  
Mesoscale Eddies ◽  
Eddy Diffusivity ◽  
Particle Dispersion ◽  
Convergence Time ◽  
Inversion Method ◽  
Massachusetts Institute Of Technology ◽  
Tracer Diffusivity ◽  
Institute Of Technology

<div> <div> <div> <p>Lagrangian methods have been used to estimate the lateral eddy diffusivity in the ocean using surface drifter and subsurface float tracks and using the numerical particles advected by satellite-derived velocity fields. The diffusivity is estimated from the rate of dispersion of these particles. Accurate point-wise estimates of diffusivity generally require averages over a large number of drifters or floats, but the distribution of drifters and floats is generally sparse and many tracks of drifters are contaminated by winds. On the other hand, the convergence time for the particle-based diffusivity is on the order of a month for both in situ and numerical particles, which makes the estimates inefficient and allows for the accumulation of measurement error. Studies of vortex-dominated 2D turbulence have found that particle dispersion is dominated by the movement of coherent eddies, and that the dispersion rate of coherent eddies themselves can provide accurate estimates of the Lagrangian diffusivity. We found that the potential vorticity diffusivity in two-layer quasigeostrophic turbulence can also be accurately estimated by the rate of dispersion of coherent eddies, and this estimate converges more than four times faster than the diffusivity estimated from particles inserted uniformly in the flow. If this result also holds for oceanic mesoscale turbulence, it can form the basis for a potentially useful technique for diagnosing mesoscale diffusivity based on the tracks of coherent mesoscale eddies.</p> <p>This presentation examines the relation between the dispersion of coherent eddies and tracer diffusivity in an idealized configuration of Massachusetts Institute of Technology general circulation model which contains multiple gyres, boundary currents, and a zonally reentrant channel flow analogous to the Antarctic Circumpolar Current. The coherent eddies are identified and tracked from the sea surface height snapshots, and the diffusivity estimated from coherent eddies is compared to the tracer diffusivity diagnosed by a tracer inversion method. The diffusivity inferred from dispersion of coherent eddies generally converges within 15 days. Direct comparison of two diffusivity estimates is not straightforward, since the tracer-based diffusivity varies vertically. Approaches for reconciling the two estimates are discussed. This study shows the possibility of relating the Lagrangian movement of coherent eddies to the Eulerian tracer diffusivity.</p> </div> </div> </div>

scholarly journals The Tracer Diffusivity of Oxygen in Wustite and Cobaltous Oxide

1982 ◽  
Vol 23 (5) ◽  
pp. 259-266 ◽  
Author(s):  
S. Yamaguchi ◽  
M. Someno
Keyword(s):  
Tracer Diffusivity

A microscopic theory of tracer diffusivity: crossover to the hydrodynamic limit

2002 ◽  
Vol 357 (3-4) ◽  
pp. 217-222 ◽  
Author(s):  
Sk. Musharaf Ali ◽  
Alok Samanta ◽  
Swapan K. Ghosh
Keyword(s):  
Hydrodynamic Limit ◽  
Microscopic Theory ◽  
Tracer Diffusivity

An analytical model of tracer diffusivity in colloid suspensions

1985 ◽  
Vol 133 (1-2) ◽  
pp. 152-172 ◽  
Author(s):  
R.B. Jones ◽  
G.S. Burfield
Keyword(s):  
Analytical Model ◽  
Tracer Diffusivity
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