scholarly journals Experimental and Data-driven approach of investigating the effect of parameters on the fluid flow characteristic of nanosilica enhanced two phase flow in pipeline

2021 ◽  
Author(s):  
Zainab Y. Shnain ◽  
Asawer A. Alwaiti ◽  
Musaab K. Rashed ◽  
Zaidon Mohsin Shakor
Keyword(s):  
Fluid Flow ◽  
Flow Characteristic ◽  
Two Phase Flow ◽  
Data Driven ◽  
Phase Flow ◽  
Two Phase ◽  
Data Driven Approach

Numerical simulation of gas-solid flow characteristic of particles in fibrous media using OpenFOAM

2019 ◽  
Vol 29 (7) ◽  
pp. 921-930 ◽  
Author(s):  
Zhiyong Shu ◽  
Fuping Qian ◽  
Jinjing Zhu ◽  
Jinli Lu
Keyword(s):  
Numerical Simulation ◽  
Flow Characteristic ◽  
Two Phase Flow ◽  
Dendritic Structure ◽  
Filtration Efficiency ◽  
Pressure Differential ◽  
Phase Flow ◽  
Fibrous Media ◽  
Two Phase ◽  
Solid Flow

Euler-Lagrangian numerical simulation framework of gas-solid two-phase flow was used to simulate the gas-solid flow characteristic in fibrous media using OpenFOAM in this study. The simulation results were compared with the empirical model and CFD-DEM method. In addition, the deposition morphology of particles, pressure differential and filtration efficiency in unsteady stage and simulation cost were also analysed with OpenFOAM. The results show that OpenFOAM can simulate the process of gas-solid two-phase flow in the fibrous media, and the particles are agglomerated on the surface of fibrous media and form a dendritic structure similar to the experimental observation. The pressure differential in unsteady stage would increase with the mass per unit area. The filtration efficiency would increase with a corresponding increase in the amount of deposition, but the growth rate would decline gradually. Compared with CFD-DEM method, the simulation accuracy with OpenFOAM is slightly lower, especially in the case of large the Stokes number, but the simulation cost is low, too. Therefore, it is necessary to choose one of the two methods according to the actual situation.

Flow characteristic evaluation of two phase flow in microchannel

2017 ◽  
Vol 2017.25 (0) ◽  
pp. 316
Author(s):  
Kento TAKAHASHI ◽  
Shuhei NISHIBU ◽  
Yanrong LI ◽  
Terumi INAGAKI
Keyword(s):  
Flow Characteristic ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase

Numerical Investigation on Two-Phase Flow Characteristic in the Separated Structure Shell-and-Tube Waste Heat Boiler

2017 ◽  
Author(s):  
Huaishuang Shao ◽  
Yungang Wang ◽  
Haidong Ma ◽  
Qinxin Zhao
Keyword(s):  
Void Fraction ◽  
Flow Characteristic ◽  
Two Phase Flow ◽  
Waste Heat ◽  
Phase Flow ◽  
Waste Heat Boiler ◽  
Shell Side ◽  
Two Phase ◽  
Saturated Water ◽  
Shell And Tube

The shell-and-tube waste heat boiler is a common facility to recover and utilize the energy of flue gas in industries. To improve the ability and efficiency of the boiler, a steam dome is configured above the drum so as to arrange more heat exchange tubes. Simulation and analysis of vapor-liquid two-phase flow across tube bundles arranged in the drum are of vital importance to design and safety operation. Numerical simulation of boiling two-phase flow across tube bundles in the drum was carried out to analyze the shell side thermal-hydraulics. Commercial software ANSYS FLUENT 14.5 was adopted for modeling and computational calculations. The applied modeling approach was validated against experimental results with a good agreement. In order to analyze the vapor-liquid two-phase flow performance under various working conditions, the inlet velocity of downcomer tubes of 3m·s−1, 4m·s−1 as well 5m·s−1 for saturated water were simulated, respectively. The pressure field, flow characteristic, void fraction distribution and heat transfer characteristic were analyzed to have a good knowledge of the boiler operation. The following conclusions have been drawn through analyzing simulation results. (1)The total pressure drop on shell side increased with increasing the inlet velocity of downcomer tubes of saturated water. (2)The velocity of saturated water decreased after flowing into the drum less than z = 0.1m as the flow area increasing, and then increased rapidly as the volume of the mixture two-phase flow increasing. (3)The integral average void fraction of the drum decreased as the mass flow rate of inlet saturated water increasing. (4)The HTC (heat transfer coefficient) of the heat exchange tubes varied with the flow direction, which is related to the vapor-water void fraction. The conclusions obtained above can be used as a reference for the design of the separated structure shell-and-tube waste heat recovery boiler.

Comparison of Alternating Direction Explicit and Implicit Procedures in Two-Dimensional Flow Calculations

1966 ◽  
Vol 6 (04) ◽  
pp. 350-362 ◽  
Author(s):  
K.H. Coats ◽  
M.H. Terhune
Keyword(s):  
Fluid Flow ◽  
Diffusion Equation ◽  
Two Phase Flow ◽  
Computing Time ◽  
Phase Flow ◽  
Two Dimensional ◽  
Two Phase ◽  
Dimensional Flow ◽  
Alternating Direction ◽  
Two Dimensional Flow

Abstract Analysis and example applications have been performed to compare the accuracy and computing speed of alternating-direction explicit and implicit procedures (ADEP and ADIP) in numerical solution of reservoir fluid flow problems. ADIP yields significantly greater accuracy and requires about 60 per cent more computing time than ADEP, not 300 or 500 per cent more as reported elsewhere. Introduction Several recent papers discuss an alternating-direction explicit difference approximation (ADEP) to the diffusion equation. Example applications of ADEP and ADIP were reported to support conclusions that ADEP is comparable in accuracy to ADIP and requires one-fifth to one-third the computing time of ADIP. Applications of ADEP in calculation of two-phase flow in reservoirs was also proposed. This study was performed to compare further the relative merits of ADEP and ADIP in simulation of two-dimensional flow of one and two fluid phases in reservoirs. Since two-phase flow equations are often essentially elliptic rather than parabolic, the efficiency of ADEP in solving the elliptic equation was also examined. ADIP AND ADEP DIFFERENCE EQUATIONS The diffusion equation: ...................(1) governs heat conduction, molecular diffusion and slightly compressible fluid flow through porous media for the case of homogeneous, isotropic media. The ADEP procedure involves replacement of Eq. 1 at odd time steps by: ,.................(2) and at even time steps by: ,.................(3) where Sweeping a two-dimensional grid from southwest to northeast using Eq. 2 and from northeast to southwest using Eq. 3 allows direct (explicit) calculation of u at the new time step at each grid point. SPEJ P. 350ˆ

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