A fully coupled numerical model for two-phase flow with contaminant transport and biodegradation kinetics

2001 ◽  
Vol 17 (5) ◽  
pp. 325-336 ◽  
Author(s):  
Claudio Gallo ◽  
Gianmarco Manzini
Keyword(s):  
Numerical Model ◽  
Contaminant Transport ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Biodegradation Kinetics ◽  
Two Phase ◽  
Coupled Numerical Model ◽  
Fully Coupled

Numerical and Mechanistic Modelling of Two-Phase Liquid-Gas Flow’s Pressure Drop Across Sharp-Edged Orifices

2019 ◽  
Author(s):  
Zurwa Khan ◽  
Reza Tafreshi ◽  
Matthew Franchek ◽  
Karolos Grigoriadis
Keyword(s):  
Numerical Model ◽  
Pressure Drop ◽  
Relative Error ◽  
Two Phase Flow ◽  
Mechanistic Model ◽  
Gas Mixture ◽  
Phase Flow ◽  
Two Phase ◽  
Pressure Drops ◽  
Phase Liquid

Abstract Pressure drop estimation across orifices for two-phase liquid-gas flow is essential to size valves and pipelines and decrease the probability of unsafe consequences or high costs in petroleum, chemical, and nuclear industries. While numerically modeling flow across orifices is a complex task, it can assess the effect of numerous orifice designs and operation parameters. In this paper, two-phase flow across orifices has been numerically modeled to investigate the effect of different fluid combinations and orifice geometries on pressure drop. The orifice is assumed to be located in a pipe with fully-developed upstream and downstream flow. Two liquid-gas fluid combinations, namely water-air, and gasoil liquid-gas mixture were investigated for different orifice to pipe area ratios ranging from 0.01 to 1 for the superficial velocity of 10 m/s. Volume of Fluid multiphase flow model along with k-epsilon turbulence model were used to estimate the pressure distribution of liquid-gas mixture along the pipe. The numerical model was validated for water-air with mean relative error less than 10.5%. As expected, a decrease in orifice to pipe area ratio resulted in larger pressure drops due to an increase in the contraction coefficients of the orifice assembly. It was also found that water-air had larger pressure drops relative to gasoil mixture due to larger vortex formation downstream of orifices. In parallel, a mechanistic model to directly estimate the local two-phase pressure drop across orifices was developed. The gas void fraction was predicted using a correlation by Woldesemayat and Ghajar, and applied to separated two-phase flow undergoing contraction and expansion due to an orifice. The model results were validated for different orifices and velocities, with the overall relative error of less than 40%, which is acceptable due to the uncertainties associated with measuring experimental pressure drop. Comparison of the developed numerical and mechanistic model showed that the numerical model is able to achieve a higher accuracy, while the mechanistic model requires minimal computation.

The Numerical Simulation of the Water Jet in Hydroentanglement

2011 ◽  
Vol 189-193 ◽  
pp. 2181-2184
Author(s):  
Heng Zhang ◽  
Xiao Ming Qian ◽  
Zhi Min Lu ◽  
Yuan Bai
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Multiphase Flow ◽  
Flow Model ◽  
Two Phase Flow ◽  
Water Jet ◽  
Phase Flow ◽  
Governing Equations ◽  
Two Phase ◽  
Set Up

The functions of hydroentangled nonwovens are determined by the degree of the fiber entanglement, which depend mainly on parameters of the water jet. According to the spun lacing technology, this paper set up the numerical model based on the simplified water jetting model, establishing the governing equations, and the blended two-phase flow as the multiphase flow model. This paper simulation the water needle after the water jetting from the water needle plate in the different pressure (100bar, 60bar, 45bar, 35bar).

Model of Water-Air Two-Phase Flow in Saturated-Unsaturated Soil

2011 ◽  
Vol 308-310 ◽  
pp. 553-558
Author(s):  
Chun Hui Fang ◽  
Xiao Yue Zhang
Keyword(s):  
Mass Transfer ◽  
Numerical Model ◽  
Capillary Pressure ◽  
Water Flow ◽  
Unsaturated Soil ◽  
Calculation Method ◽  
Two Phase Flow ◽  
Air Flow ◽  
Phase Flow ◽  
Two Phase

For seepage in unsaturated soil, there are both air flow and water flow, which can be called the water-air two-phase flow. In order to simulate the water-air two-phase flow in soil when there is groundwater, a numerical model of water-air two-phase flow in saturated-unsaturated soil is established in this paper. By the model, the air-flow and water-flow in unsaturated soil are both considered in seepage calculation. And the mass transfer between air-phase and water-phase, change of phase states are considered in calculation. Capillary pressure is the most important factor for the water-air two-phase flow in unsaturated soil, and the calculation method of capillary pressure is also given in the paper. At last examples are given to verify the correctness of the numerical model and the calculation method.

scholarly journals A Numerical Model of Tracer Transport in a Non-isothermal Two-Phase Flow System for $${\text{ CO}}_2$$ Geological Storage Characterization

2013 ◽  
Vol 98 (1) ◽  
pp. 173-192 ◽  
Author(s):  
Fuguo Tong ◽  
Auli Niemi ◽  
Zhibing Yang ◽  
Fritjof Fagerlund ◽  
Tobias Licha ◽  
...  
Keyword(s):  
Numerical Model ◽  
Two Phase Flow ◽  
Flow System ◽  
Phase Flow ◽  
Geological Storage ◽  
Tracer Transport ◽  
Two Phase

scholarly journals A fully coupled thermal-hydraulic-mechanical model with two-phase flow for coalbed methane extraction

2016 ◽  
Vol 33 ◽  
pp. 324-336 ◽  
Author(s):  
Sheng Li ◽  
Chaojun Fan ◽  
Jun Han ◽  
Mingkun Luo ◽  
Zhenhua Yang ◽  
...  
Keyword(s):  
Mechanical Model ◽  
Coalbed Methane ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Methane Extraction ◽  
Fully Coupled
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