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Dust or sand heavy environments cause many problems for the aircraft industry due to the impact of fine particles upon equipment lifespan. We created a CFD model and conducted the numerical simulations needed to determine the distribution of a granular secondary phase within a multiphase flow using the Eulerian Model. The flow consists of sand or dust laden hot air, used in a harsh environment testing...
This study presents a new semi-analytical model to predict hydrate formation in subsea pipelines. The numerical formulation is based on a non-dimensional analysis, allowing the model to be extended to various pipeline lengths and environmental conditions. The effects of change in heat transfer ratio (HTR), and pipe diameter on hydrate formation are reported in this paper. The results indicate that...
CO 2 injection and storage in deep saline aquifers involves many coupled processes, including multiphase flow, heat and mass transport, rock deformation and mineral precipitation and dissolution. Coupling is especially critical in carbonate aquifers, where minerals will tend to dissolve in response to the dissolution of CO 2 into the brine. The resulting neutralization will drive further...
Analysis of permafrost dynamics with a three-phase, two-component flow system coupled to heat transport is used to evaluate transient changes in groundwater seepage. Both seasonal and annual analysis of flow is conducted, assuming three warming temperature trends over a ten year period, representing three climate change scenarios. Previous results have indicated that a reduction in temporal variability...
With the exploration and development of oil and gas resources in ocean, desert, polar and other regions, multiphase transport technology has been more widely used. When the mixture flows in pipelines, different flow patterns will be formed as parameters' changes. The dynamics and heat transfer characteristics are varied with the changes of flow pattern. So, it is very important to study the flow pattern...
A three-dimensional Euler-Lagrange model was used to study the distribution of particles in scrubbing-cooling chamber of coal-water-slurry (CWS) entrained-flow gasifier. Comparisons of computational results with experimental data are made. The effects of operating conditions and size grading on the particle number density distribution in chamber is revealed through simulation. The results indicate...
A nonlinear flow reservoir mathematical model is established, and the numerical stimulation program is compiled based on black-oil model, whose purpose is to simulate the fluid flow in ultra-low permeability reservoir. Actual field data is used to make a pilot calculation, and the comparative stimulating results analysis under different nonlinear flow curves and Darcy flow is provided, which has verified...
In modern times, computer technology is used in various fields in the world. In this paper, CFD(computational fluid dynamics) was applied to build mathematical model to simulate continuous and dispersed multiphase flow in the experimental systems and an industrial electrolyzer. The Volume of Fluid model was used in the mathematical model for multi-phases. Cold model system of complex multiphase behavior...
The comprehensive numerical simulation and analysis of flow field in the three-dimensional model of cyclone in three-phase test separation were performed by Fluent. Using RSM, the turbulence numerical simulation method, the relationship was researched between each parameter and the separation efficiency of cyclone, such as pressure, coning, overflow pipe diameter, then select the appropriate parameter...
This paper presents numerical study of droplet dynamics on solid surface using multiphase model of lattice Boltzmann method. This method is an efficient alternative tool for the numerical simulation of multiphase flow. In this paper, we start by describing a choice of interaction potential that reproduces the attraction force between particles together with the varying contact angles on surface by...
The cavitating flow in nozzle holes is thought to be a very important factor to affect diesel fuel spray characteristics. In order to study the effect of cavitation on the internal flow of diesel nozzle, the 3d numerical simulation of cavitating flow developed fully in holes of a vertical four-hole VCO nozzle with mixture multi-phase cavitating flow model was carried out. The effects of injection...
Small scale multiphase fluid motion is fundamentally important for applications in environmental, biological and chemical engineering as well as many other areas. Due to the existence of complex geometries, arbitrarily moving interfaces, and large density and viscosity contrast, simulation of small scale multiphase flows has been a formidable task for traditional grid-based numerical methods. This...
In this paper, a novel computational scheme, local whole-information difference scheme (LWDS), was proposed to solve significant pseudo diffusion in recirculating flow zone during numerical simulation. In LWDS, the effect of all of the local around points on the control volume was considered to demonstrate the spatial characteristics of the flow, and the weighted value at each point is adjusted according...
Numerical simulation of the kerosene in a high pressure centrifugal pump was conducted based on viscous N-S equations and multiphase flow. The cause, location and initiation factors of cavitations were investigated. Actual conditions of centrifugal pump were introduced into the numerical simulation. It shows that the simulation results are in good accordance with the actual damage to centrifugal pump...
A liquid bath model for simulating the liquid slag and metal behavior of multi-fluid problems defined in 3D cylindrical geometries is presented, which is developed based on computational fluid dynamics (CFD) approach. As to the issue of the multi-phase flow, a volume of fluid (VOF) model and standard k-epsi turbulent model are employed in this model. The volume fraction distribution of liquid slag...
Mixture multiphase flow model and several common turbulent models of the computational fluid dynamics (CFD) are chose. According to the two-phase turbulent coupling characteristic of powder, hot-air flow field and the operation data of the vertical roller mill chamber, it analyzed three-dimensional flow of the chamber using standard turbulent model, RNG turbulent model and Reynolds stress equation...
In this work, a new level-set-based approach is presented and applied to compressible, multiphase flows. Using a species-mass-conservation-based level-set transport equation, several advantages over signed-distance-function-based methods are demonstrated. Specific improvements include a ghost-fluid-free method for highly compressible problems, extensions to an arbitrary number of specie, and finite-rate...
Flue gas injection can be used for enhcanced oil recovery. The main content of the flue gas is CO2. In order to better understand the interaction between phase behavior and multiphase flow in a porous medium for a CO2 injection. In this paper, the solution technique for one dimensional, dispersion-free flow of four-component mixtures with mixture viscosity changing and viscosity fingering which is...
A mathematical model of the abrasive water-jet (AWJ) nozzle based on the multiphase hydrokinetics was established and the boundary conditions were determined. The liquid-solid flow rule of the cone nozzles with the cylinder section of the pre-mixed AWJ was simulated with the software FLUENT. The results show that the axial velocity and dynamic pressure of the continuous phase in the nozzle is notably...
Transformer explosions are caused by electrical arcs occurring in the insulating oil. They generate dynamic pressure waves that propagate in the tank and interact with its structure leading to its explosion. This whole process was studied using experiments performed on large scale transformers. Moreover, to accurately study the phenomena exhibited during this experimental campaign and in order to...
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