Channel size effect on drift-flux parameters for adiabatic and boiling two-phase flows

2022 ◽  
Vol 185 ◽  
pp. 122410
Author(s):  
Takashi Hibiki ◽  
Peng Ju ◽  
Somboon Rassame ◽  
Shuichiro Miwa ◽  
Xiuzhong Shen ◽  
...  
Keyword(s):  
Size Effect ◽  
Two Phase Flows ◽  
Two Phase ◽  
Channel Size ◽  
Drift Flux

Recent Progress in the Studies of Gas-Liquid Two-Phase Flows at Microgravity Conditions

2003 ◽  
Author(s):  
Tomoji Takamasa ◽  
Takashi Hibiki
Keyword(s):  
Recent Progress ◽  
Interfacial Area ◽  
Phase System ◽  
Two Phase Flows ◽  
Two Phase ◽  
Interfacial Area Transport ◽  
Drift Flux ◽  
Wide Range ◽  
Microgravity Conditions ◽  
Heat Loads

In a thermal system of spacecraft, two-phase flow system now is an excellent alternative to the conventional single-phase system in transporting large amount of thermal energy at a uniform temperature regardless of variations in the heat loads. In addition, two-phase flows exist in a wide range of applications and enabling technologies in space. This report outlines recent progress in the studies of gas-liquid two-phase flows at microgravity conditions, especially for which regarding to interfacial area transport and drift flux.

Zuber-Type Parameter Distributions for Non-Equilibrium Two-Phase Flows: Generalization for Annular Channel and Rod Cluster Geometries

2013 ◽  
Author(s):  
Y. Kornienko
Keyword(s):  
Current Method ◽  
Annular Channel ◽  
Elementary Functions ◽  
Two Phase Flows ◽  
Principle Of Superposition ◽  
Two Phase ◽  
Drift Flux Model ◽  
Drift Flux ◽  
Cross Section Profile ◽  
Non Equilibrium

This study presents the main results of the analysis of the previously developed generalized hierarchical closed system of analytical closure relations for the distribution parameters (DPs) Cks (k = f - fluid or g - vapor; s = 0,1,2,3 - mass, energy, momentum) that are used in quasi-one-dimensional form of the conservation laws for mass, momentum and energy in non-equilibrium two-phase flows. The current method has been expanded to account for non-uniform in cross-section profile of void fraction. The main assumptions of the received quadrature relationships for DP are: (a) the use of the drift flux model, (b) the quasi-steady-state approximation, and (c) the power-mode approximations of the local distribution profiles of the variables. These DPs Cks quadrature are expressed in terms of elementary functions, they directly reflect the principle of superposition, generalize and unify not only the Zuber-Findlay method, but also Hancox-Nicoll and Hibiki-Ishii methods. The revealed complementarity properties are particularly useful for the purposes of testing, validating and verifying DPs.

A New Multidimensional Drift Flux Mixture Model for Gas–Liquid Droplet Two-Phase Flow

2015 ◽  
Vol 12 (04) ◽  
pp. 1540001 ◽  
Author(s):  
Zhi Shang ◽  
Jing Lou ◽  
Hongying Li
Keyword(s):  
Mixture Model ◽  
Liquid Droplet ◽  
Diffusion Flux ◽  
Water Mist ◽  
Liquid Droplets ◽  
Two Phase Flows ◽  
Two Phase ◽  
Drift Flux Model ◽  
Drift Flux ◽  
Flux Model

A new multidimensional drift flux mixture model was developed to simulate gas–liquid droplet two-phase flows. The new drift flux model was modified by considering the centrifugal force on the liquid-droplets. Therefore the traditional 1D drift flux model was upgraded to multidimension, 2D and 3D. The slip velocities between the continual phase (gas) and the dispersed phase (liquid droplets) were able to calculate through the multidimensional diffusion flux velocities based on the new modified drift flux model. Through the numerical simulations comparing with the experiments and the simulations of other models on the backward-facing step and the water mist spray two-phase flows, the new model was validated.

Stability Analysis of Two-Phase Flows in Pipe-Riser Systems

2000 ◽  
Author(s):  
Erich Zakarian
Keyword(s):  
Hydrodynamic Instability ◽  
Momentum Balance ◽  
Quasi Equilibrium ◽  
Two Phase Flows ◽  
Two Phase ◽  
Drift Flux Model ◽  
Drift Flux ◽  
Differential Algebraic System ◽  
Flux Model ◽  
Liquid Flows

A differential-algebraic system is presented to model unstable two-phase flows in pipe-riser systems. Equations derive from the space integration of an isothermal drift-flux model assuming quasi-equilibrium momentum balance. A linear analysis of this system gives a new stability criterion for gas-liquid flows in pipe-riser systems. This criterion is validated by laboratory experiments. Then, a nonlinear analysis shows that the severe slugging phenomenon is a hydrodynamic instability coming from a supercritical Hopf bifurcation.

Sign in / Sign up

Export Citation Format

Share Document