Highly unsteady heat and mass transfer in a region with moving boundaries when the kinetic equations are unknown

1986 ◽  
Vol 51 (2) ◽  
pp. 991-994
Author(s):  
I. A. Solov'ev ◽  
M. S. Smirnov
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Kinetic Equations ◽  
Moving Boundaries

scholarly journals Mean action time for diffusive processes

2000 ◽  
Vol 4 (2) ◽  
pp. 125-141 ◽  
Author(s):  
Kerry Landman ◽  
Mark Mcguinness
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Poisson Equation ◽  
Diffusion Problem ◽  
Moving Boundaries ◽  
Action Time ◽  
Novel Applications ◽  
Diffusive Processes ◽  
Penetration Time

For a number of diffusive processes involving heat and mass transfer, a convenient and easy way to solve for penetration time or depth is to consider an averaged quantity called mean action time. This approach was originally developed by Alex McNabb, in collaboration with other researchers. It is possible to solve for mean action time without actually solving the full diffusion problem, which may be nonlinear, and may have internal moving boundaries. Mean action time satisfies a linear Poisson equation, and only works for finite problems. We review some nice properties of mean action time, and discuss some recent novel applications.

scholarly journals Applying an updated method of markers to defining transient force impact under multiphase flowing

2020 ◽  
pp. 45-57
Author(s):  
V. I. Pegov ◽  
◽  
I. Yu. Moshkin ◽  
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Moving Boundaries ◽  
Coarse Particle ◽  
Validation And Verification ◽  
Force Impact ◽  
Transient Force ◽  
Active Interaction ◽  
High Temperature Gas

Numerical simulation of transient hydrodynamic forces from shaped gas cavities formed in liquid under active interaction of liquid and a jet source of high-temperature gas and intensive heat and mass transfer is performed. To solve the task, a method of coarse particle markers with, as opposed to the classical one, an additional stage, when moving boundaries of different media in cells with interfaces of these media are as if stitched, is updated. In addition, problems of inter-media heat and mass transfer by condensation and evaporation are simultaneously solved. The predicted results are compared with the experimental data. Validation and verification are performed by comparing the analysis results with the experimental data. The applicability of the updated method of coarse particle markers to defining transient force impact under multiphase flowing is demonstrated.

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