Modares Mechanical Engineering

Modares Mechanical Engineering

Development of an Optimized Numerical Model for Numerical Analysis of Two-Phase Fluid Flow in Vertical Channel with Variable Flux in Transient Mode

Document Type : Original Research

Authors
Younes Bakhshan
mohammadmehdi pourjam
Jamshid Khorshidi
Hormozgan University
10.48311/mme.25.2.65
Abstract
In this research a new fully implicit numerical scheme has been developed for the simulation of transient two-phase flow in a vertical channel. The development of multi-scale modeling capabilities through the use of thermal-hydraulic coupled systems and numerical fluid dynamics methods and the Jacobin-Krylov method has been investigated in this article. Here, the two-phase mixture of saturated steam and incompressible gas (steam-air mixture) is considered as a whole and the volume of fluid (VOF) model is used. Also, the RNG k-Ɛ turbulence model is used and the wall boiling phenomenon is modeled with the partitioned heat flux model. The purpose of this study is to check the validity, accuracy and use of the developed numerical model. This study also confirms the capability of the developed tool to predict the impact of such phenomena on system behavior and to record the development of thermal stratification in a plenum with low mass flow. Comparing our results with the existing results is applicable for investigating thermohydraulic transients without stability limitations and the model developed in this research is simpler, more accurate and faster than other methods
Keywords
Vertical channel
Heat and mass transfer
Steam-Air Mixture
flow rate
Fortran

Subjects

1-Comparison of phase interaction models for high pressure subcooled boiling
flow in long vertical tubes
2-A new platform for core thermal-hydraulic studies
3-Formulation of a fully implicit numerical scheme for simulation of two-phase flow in a vertical channel using the Drift-Flux Model
4-TAPINS: a thermal-hydraulic system code for transient analysis of a fully-passive integral PWR., Nuclear Engineering Technology
5-Development and assessment of system analysis code, TASS/ SMR for integral reactor, SMART
6-Condensation heat transfer in the presence of non-condensable, interfacial resistance, superheating, variable properties, and diffusion
7-Effects of non-condensable gas on laminar film condensation in a vertical tube
8-Turbulent vapor condensation with non-condensable gases in vertical tubes
9-Laminar mixed convection of humid air in a vertical channel with evaporation or condensation at the wall
10-Convective condensation of vapor in the presence of a non-condensable gas of high concentration in laminar flow in a vertical pipe
11-Effect of air humidity at the entrance on heat and mass transfers in a humidifier intended for a desalination system
12-CFD Simulation of water vapor condensation in the presence of non-condensable gas in vertical cylindrical condensers
13-Numerical analysis of mixed-convection laminar film condensation from high air mass fraction steam-air mixtures in vertical tubes
14-A study of mixed convection heat transfer with condensation from a parallel plate channel
15-3-D computational investigation and experimental validation of effect of shear-lift on two-phase flow and heat transfer characteristics of highly subcooled flow boiling in vertical up flow
16-Numerical analysis and experimental study of two-phase flow pattern and pressure drop characteristics in internally microfin tubes
17-Experimental study of boiling flow in a vertical heated annulus with local two-phase measurements and visualization
18-Numerical simulation of liquid-liquid two-phase flow heat transfer in circular microchannels
19-Drift-flux model for dispersed adiabatic and boiling two-phase flows in rectangular channels
20-Interaction between vapor bubbles during flow boiling heat transfer in
microchannels
Modares Mechanical Engineering
Volume 25, Issue 2
February 2025
Pages 65-76