Effects of interphase boundaries in Ginzburg–Landau one-dimensional model of two-phase states in clamped systems

2021 ◽  
Vol 129 (4) ◽  
pp. 044102
Author(s):  
Arkady P. Levanyuk ◽  
Sergey A. Minyukov ◽  
I. Burc Misirlioglu ◽  
M. Baris Okatan
Keyword(s):  
Dimensional Model ◽  
Two Phase ◽  
Ginzburg Landau ◽  
One Dimensional ◽  
Interphase Boundaries

Mathematical modeling of dispersed media flows in the presence of nucleation, coagulation and phase transitions

2021 ◽  
Vol 102 (2) ◽  
pp. 14-24
Author(s):  
T.R. Amanbaev ◽  
◽  
G.E. Tilleuov ◽  
A. Zuparbekova ◽  
◽  
...  
Keyword(s):  
Phase Transitions ◽  
Saturation Temperature ◽  
Dimensional Model ◽  
Two Phase ◽  
One Dimensional ◽  
Dispersed Medium ◽  
Nucleation Model ◽  
Coagulation Equation ◽  
Media Flows ◽  
Vapor Temperature

A model of motion of a gas-dispersed medium in the presence of processes of nucleation, coagulation and phase transitions has been constructed. A homogeneous nucleation model is used to describe the nucleation process. It is believed that the process of cluster coagulation occurs due to their Brownian motion. The analysis of the solution of the coagulation equation in the particular case of monodisperse clusters in the presence of a source and sink of particles is carried out. To determine the rate of phase transitions the Hertz-KnudsenLangmuir formula is used. The calculations were carried out on the basis of a quasi-one-dimensional model within the equilibrium approximation (when the velocities and temperatures of the phases coincide). As a result of the study the main properties of the flow of a two-phase mixture in a channel in the presence of nucleation, coagulation, and phase transformations have been established. It is shown that the vapor temperature increases along the channel and reaches the saturation temperature at some distance from the channel entrance. Calculations have shown that the coagulation process has a rather strong effect on the distribution of cluster sizes along the channel.

scholarly journals Calculation of Two-Phase Dispersed Droplet-In-Vapor Flows Including Normal Shock Waves

1978 ◽  
Vol 100 (3) ◽  
pp. 355-362 ◽  
Author(s):  
W. J. Comfort ◽  
T. W. Alger ◽  
W. H. Giedt ◽  
C. T. Crowe
Keyword(s):  
Shock Waves ◽  
Normal Shock ◽  
Vapor Flow ◽  
Dimensional Model ◽  
Two Phase ◽  
One Dimensional ◽  
Pressure Profiles ◽  
Pressure Equilibrium ◽  
Temperature And Pressure ◽  
Measured Pressure

A method for calculating quasi-one-dimensional, steady-state, two-phase dispersed droplet-in-vapor flow has been developed. The technique is applicable to both subsonic and supersonic single component flow in which normal shock waves may occur, and is the basis for a two-dimensional model. The flow is assumed to be inviscid except for droplet drag. Temperature and pressure equilibrium between phases is assumed, although this is not a requirement of the technique. Example calculations of flow in one-dimensional nozzles with and without normal shocks are given and compared with experimentally measured pressure profiles for both low quality and high quality two-phase steam-water flow.

The Effects of Mach Number on Keyhole Shape in High Intensity Beam Welding or Drilling

2009 ◽  
Author(s):  
Shih C. Kuo ◽  
Peng S. Wei ◽  
Tarasankar DebRoy
Keyword(s):  
Mach Number ◽  
Liquid Layer ◽  
Pore Formation ◽  
Welding Process ◽  
Dimensional Model ◽  
Homogeneous Fluid ◽  
Two Phase ◽  
Molten Layer ◽  
One Dimensional ◽  
Fundamental Understanding

This work is to predict collapse of the molten layer surrounding the keyhole filled with vapor and droplets during drilling or high power density beam welding process. Investigating collapse of the liquid layer is essentially required for an understanding of pore formation in keyhole welding. The collapse of the keyhole is similar to transition between the slug and annular two-phase flows encountered in fluid flow field. In this study, a steady, averaged one-dimensional model widely used in two-phase flow areas is provided. The mixture in the core is treated as a homogeneous fluid. For the sake of clarification, friction induced by the liquid layer and energy absorbed by the vapor are neglected. It shows that, in contrast to insensitive effects of subsonic Mach number, the keyhole subject to supersonic Mach number at the base is readily enclosed or collapsed. A fundamental understanding of pore formation is revealed.

A ONE-DIMENSIONAL TWO-PHASE FLOW MODEL AND EXPERIMENTAL VALIDATION FOR A FLASHING VISCOUS LIQUID IN A SPLASH PLATE NOZZLE

2015 ◽  
Vol 25 (9) ◽  
pp. 795-817 ◽  
Author(s):  
Mika P. Jarvinen ◽  
A. E. P. Kankkunen ◽  
R. Virtanen ◽  
P. H. Miikkulainen ◽  
V. P. Heikkila
Keyword(s):  
Viscous Liquid ◽  
Experimental Validation ◽  
Flow Model ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
One Dimensional
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