scholarly journals On the flux distribution in a one dimensional disordered system

1994 ◽  
Vol 4 (5) ◽  
pp. 635-653 ◽  
Author(s):  
C�cile Monthus ◽  
Alain Comtet
Keyword(s):  
Flux Distribution ◽  
Disordered System ◽  
One Dimensional

scholarly journals The influence of vertical density and velocity distributions on snow avalanche runout

2010 ◽  
Vol 51 (54) ◽  
pp. 200-206 ◽  
Author(s):  
Ashok K. Keshari ◽  
Deba P. Satapathy ◽  
Amod Kumar
Keyword(s):  
Flux Distribution ◽  
Numerical Solutions ◽  
Model Parameters ◽  
Dynamics Model ◽  
Turbulent Friction ◽  
One Dimensional ◽  
Variation Diminishing ◽  
Flow Features ◽  
Vertical Density ◽  
Two Fluid

AbstractA one-dimensional avalanche dynamics model accounting for vertical density and velocity distributions is presented. Mass and momentum flux distribution factors are derived to incorporate the effect of density and velocity variations within the framework of depth-integrated models. Using experiments of avalanche flows on an inclined snow chute at Dhundhi, Manali, India, we conceptualize snow flow rheology as a Voellmy fluid where the distribution of internal shearing is given by a Newtonian fluid (NF) or Criminale–Ericksen–Filbey fluid (CEFF). Then the generalized mass and momentum distribution factors are computed for these two fluid models for different density stratifications. Numerical solutions are obtained using a total variation diminishing Lax–Friedrichs (TVDLF) finite-difference method. The model is validated with the experimental results. We find that the flow features of the chute experiments are simulated well by the model. The velocities and runout distances are obtained for the Voellmy model with both NF and CEFF extensions for various input volumes, and the optimum values of the model parameters, namely, coefficients of dynamic and turbulent friction, are determined.

A One-Dimensional Model of Simultaneous Hemodialysis and Ultrafiltration With Highly Permeable Membranes

1981 ◽  
Vol 103 (4) ◽  
pp. 261-266 ◽  
Author(s):  
M. Y. Jaffrin ◽  
B. B. Gupta ◽  
J. M. Malbrancq
Keyword(s):  
Protein Concentration ◽  
Flux Distribution ◽  
Transmembrane Pressure ◽  
Dimensional Model ◽  
One Dimensional ◽  
Diffusive Mass Transfer ◽  
Model Predictions ◽  
Polyacrylonitrile Membrane ◽  
Good Agreement

A one-dimensional model of combined convective and diffusive mass transfer in a hemodialyser is presented. Solutions and results are given for two regimes of ultrafiltration (UF): at low transmembrane pressures when UF flow is proportional to transmembrane pressure and in the limit of large transmembrane pressures when UF is limited by protein concentration polarization. It is found that the overall clearance is always less than the sum of dialytic and UF clearances due to interaction between convective and diffusive transfers. For a given UF flow the clearance is not sensitive to UF flux distribution along the membrane. Model predictions of urea clearance are in good agreement with measurements obtained in vitro with saline on hemodialysers equipped with a polyacrylonitrile membrane.

scholarly journals Localization of relativistic electrons in a one-dimensional disordered system

1994 ◽  
Vol 27 (9) ◽  
pp. 3285-3291 ◽  
Author(s):  
C Basu ◽  
C L Roy ◽  
E Macia ◽  
F Dominguez-Adame ◽  
A Sanchez
Keyword(s):  
Relativistic Electrons ◽  
Disordered System ◽  
One Dimensional
Sign in / Sign up

Export Citation Format

Share Document