A Numerical study of Two-Phase flow through a Rectangular Duct with a Convergence Ribs

Two-phase flow in ribbed convergent rectangular upward vertical duct was studied.Water and air were usedas materials for two-phase. Numerical studies have been performed to test the influence of increased air and water discharges on the pressure profile and pressure drop through the convergent section, as the effect of increasing the convergent angle on the pressure difference across the convergent section was studied.Water inlet discharges used were between (5-20 L/min), and air discharges were between (5.833-16.666 L/min). Two test channels with convergent angles (10 and 15 degrees) were used.Computational fluid dynamics for a three-dimensional model was simulated with ANSYS fluent 18 depending on the boundary condition and governed by equations of Eulerian multiphase flow model.The results indicated that the pressure along the test channel raises as water and air discharge rise. It was observedtoo the pressure drop increases with the increase of the convergence angle.

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Numerical Study on the Tandem Submerged Hydrofoils Using RANS Solver

Mathematical Problems in Engineering ◽

10.1155/2021/8364980 ◽

2021 ◽

Vol 2021 ◽

pp. 1-17

Author(s):

Moloud Arian Maram ◽

Hamid Reza Ghafari ◽

Hassan Ghassemi ◽

Mahmoud Ghiasi

Keyword(s):

Drag Coefficient ◽

Single Phase ◽

Two Phase Flow ◽

Numerical Study ◽

Lift Coefficient ◽

Lower Surface ◽

Phase Flow ◽

Two Phase ◽

Hydrodynamic Coefficient ◽

Ansys Fluent

This paper is presented on the tandem two-dimensional hydrofoils with profiles NACA4412 in single-phase and two-phase flow domains for different submergence depths and different distances in a various angle of attack (AoA). Also, supercavitation is studied at σ = 0.34 by the Zwart cavitation model. Reynolds-averaged Navier–Stokes (RANS) with the shear stress transport (SST) K-ω is employed as a turbulence model in transient analysis of Ansys FLUENT software. The numerical results show that, by increasing depth, the drag coefficient increases for both hydrofoils 1 and 2 as well as the lift coefficient. The drag coefficient of hydrofoil 2 is bigger than hydrofoil 1 for all depths; moreover, it was found that the flow pressure behind the hydrofoil 1 had affected the upper and the lower surface of the hydrofoil 2 at each distance or AoA. These effects are observed in the hydrofoil 2 lift coefficient as well as the flow separation. However, the maximum lift-to-drag ratio is observed at AoA = 8 ° and 3.5c distance. Also, single-phase results reveal that the value of pressure and the hydrodynamic coefficient are very different from the two-phase flow results, due to the elimination of the free surface. So, a two-phase flow domain is recommended for increasing the accuracy of results. In addition, the investigation of supercavitation shows a growth in cavity occurrence on the surface by raising AoA.

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Three-dimensional numerical study on evaporating two-phase flow in heated micro T-junction

Chemical Engineering Science ◽

10.1016/j.ces.2021.117375 ◽

2021 ◽

pp. 117375

Author(s):

Zhe Yan ◽

Haoxiang Huang ◽

Shanshan Li ◽

Wei Wang ◽

Zhenhai Pan

Keyword(s):

Two Phase Flow ◽

Numerical Study ◽

Three Dimensional ◽

Phase Flow ◽

Two Phase

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Numerical Analysis of Flow at Water Jacket of an Internal Combustion Engine

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.282-283.702 ◽

2011 ◽

Vol 282-283 ◽

pp. 702-705 ◽

Cited By ~ 1

Author(s):

De Zhi Zhang ◽

Ying Ai Jin ◽

De Yuan Su ◽

Qing Gao

Keyword(s):

Two Phase Flow ◽

Cooling System ◽

Combustion Engine ◽

Three Dimensional ◽

Operating Conditions ◽

Phase Flow ◽

Three Dimensional Model ◽

Two Phase ◽

Water Jacket ◽

Model And Simulation

With the increasing degree of the enhancement of engine, engine cooling system design is considered particularly important. This paper used an established three-dimensional model of an engine water jacket to study, and used UDF function in the two-phase flow of the CFD, describe the mathematical model and simulation the engine at different operating conditions, and get the water jacket flow rate transfer thermal process. Finally, the results of the relationship between the engine water jacket of boiling heat transfer and flow velocity have been studied, and the importance of using two-phase flow model has been summarized.

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Preliminary Results of Numerical Simulation of Slug Flow in a Regular T-Junction

MATEC Web of Conferences ◽

10.1051/matecconf/201822503001 ◽

2018 ◽

Vol 225 ◽

pp. 03001

Author(s):

Minh Tran ◽

Zeeshan Memon ◽

William Pao ◽

Fakhruldin M Hashim

Keyword(s):

Slug Flow ◽

Two Phase Flow ◽

Separation Efficiency ◽

Flow Behavior ◽

Three Dimensional ◽

Piping System ◽

Phase Flow ◽

Two Phase ◽

Ansys Fluent ◽

System A

Excessive liquid carryover in T-junction due to splitting nature of two-phase flow causes serious issues in piping system. A three-dimensional numerical model is employed to investigate two-phase flow split behavior of slug flow in a circular-section regular T-junction with 0.0752 m diameter. The Volume of Fraction method combined with k-ε turbulence model and initial sinusoidal perturbation in ANSYS FLUENT is adopted to characterize the effect of slug flow behavior on the phase separation efficiency. The preliminary result reveals that the simulation work can study slug flow split in great detail and the slug characteristic plays an important role in understanding split behavior.

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Numerical study of three-dimensional droplet impact on a flowing liquid film in annular two-phase flow

Chemical Engineering Science ◽

10.1016/j.ces.2017.04.015 ◽

2017 ◽

Vol 166 ◽

pp. 303-312 ◽

Cited By ~ 25

Author(s):

Zhihua Xie ◽

Geoffrey F. Hewitt ◽

Dimitrios Pavlidis ◽

Pablo Salinas ◽

Christopher C. Pain ◽

...

Keyword(s):

Liquid Film ◽

Two Phase Flow ◽

Numerical Study ◽

Three Dimensional ◽

Droplet Impact ◽

Phase Flow ◽

Two Phase ◽

Flowing Liquid

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Deposition of Chloride in Two-Phase Flow for the Superheater via Numerical Simulation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.354-355.236 ◽

2011 ◽

Vol 354-355 ◽

pp. 236-239 ◽

Cited By ~ 1

Author(s):

Song Ying Chen ◽

Jun Jie Mao

Keyword(s):

Flue Gas ◽

Two Phase Flow ◽

Volume Fraction ◽

Three Dimensional ◽

High Volume ◽

Phase Flow ◽

Dimensional Model ◽

Three Dimensional Model ◽

Two Phase ◽

Velocity Magnitude

This paper reports the results of a study on the reason for chlorine-induced corrosion in the superheater, the factor of corrsion is caused by the chloride deposit. A three-dimensional model is performed in order to analyse chloride particles deposit in the flue-gas. The use of CFD codes for modeling of two-phase flow, it is important to know whether or not deposition will be present in some sensitive location. The RNG k-ε turbulence model and mixture model are employed in the article. The predicted results show that the volume fraction of particles phase varies along with the flow field. Chloride particles may deposit where the area of high volume fraction. Actually, under the condition of different velocity magnitude, the deposition of chloride particles is existed on the border of the baffle and at the bottom of the vessel.

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