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Showing 1 to 20 of 36 for “"Two-fluid model"”.
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Improved closure relations for the two fluid-model in flashing flows
The two-fluid model is a widely used approach for the modeling of two-phase flows, consisted of two separate sets of mass, momentum, and energy conservation equations for the liquid and gas phases. In the two-fluid model, the interaction between the phases is determined by the mass, momentum, and …
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Well-posedness and convergence of cfd two-fluid model for bubbly flows
… on developing a well-posed multidimensional CFD two-fluid model (TFM) for bubbly flows. Two-phase flows exhibit a wide range of local flow instabilities such as Kelvin-Helmholtz, Rayleigh-Taylor, plume and jet instabilities. They arise due to the density difference and/or the relative velocity …
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Vapor Generation in the Two-Group Two-Fluid Model in Boiling Flow
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-12-01
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Influence of the city geometric features on the two fluid model parameters
The traffic flow in an urban street network is a complicated system which involves many variables. Some of these variables relate to the network's geometric features; some of these variables reflect the characteristics of the vehicles, drivers and pedestrians using the network. The Two Fluid Model …
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Sensitivity of the Two-Fluid Model to Constitutive Correlations for Large Diameter Pipes
… effect on the void fraction prediction. The two-group approach for calculating drift-flux was found to have a higher accuracy than the one-group approach. A new drift-flux correlation was developed using the two-group approach, and was able to predict void fraction with a RMS error of 10.5%. …
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The two-fluid model with interfacial area transport equation in gas-dispersed condensing flows
The student, Vineet Kumar, accepted the attached license on 2019-10-01 at 17:11.
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Two-phase two-fluid model solver based on a high-resolution total variation diminishing scheme
A new numerical method and a solver for the two-phase two-fluid model are developed using an innovative high-resolution, Total Variation Diminishing (TVD) scheme. The new scheme is derived first for scalar hyperbolic problems using the method of flux limiters, then extended to the two-phase …
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Adjoint sensitivity analysis of the two-phase two-fluid model based on an approximate Riemann solver
… adjoint sensitivity analysis framework for the two-phase two-fluid model are developed and verified. Both the numerical solver and the adjoint sensitivity analysis framework are based on an analytical analysis of the two-phase two-fluid model. The challenge (due to the arbitrary equation of …
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NUMERICAL ANALYSIS OF TURBULENT GAS-SOLID FLOWS IN A ROUGH HORIZONTAL CHANNEL USING THE EULERIAN TWO-FLUID MODEL
… materials such as pulverized coal, circulating fluidized beds and dust and particle-exhaust pollution control systems. Modelling the gas-solid flow is a major challenge since the flow is turbulent which renders the system non-linear. In addition, the presence of particles further complicates the …
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Analysis of interfacial forces on the physics of two-phase flow and hyperbolicity of the two-fluid model
The scope of this Master Thesis is the two-fluid model. This study aims at analysing their ill-posedness, showing how it is related to non-hyperbolicity and giving a measurement that I call the numerical hyperbolicity. As a cure to this important issue, we will propose a combination of physical and …
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An Unequal Velocity, Unequal Temperature Two-Fluid Model of Vapor-Liquid Flow and Solution of a Standard Blowdown Problem
Made available in DSpace on 2017-07-06T18:42:40Z (GMT). No. of bitstreams: 3 Ho_Szu-Hsiung_PhD.pdf: 84258926 bytes, checksum: dbcbb8ca8737f66fab7a2f4ba566c332 (MD5) Ho_Szu-Hsiung_PhD_ABS.pdf: 907525 bytes, checksum: e7e058883ef0ca74c8f46d0a2fb3956a (MD5) license.txt: 4813 bytes, checksum: …
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Using Simulink to Develop a One-Dimensional, Two-Phase Fluid Model
In this thesis, a one-dimensional, two-fluid model is developed in MATLAB-Simulink. The model features a mass, momentum, and energy balance for each fluid--an ideal gas and an incompressible liquid. The simulation may model a straight pipe section, or a pipe section that involves a cross-sectional …
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Integrated multiphase flow modeling in wellbore for downhole pressure predictions
… various disciplines that pertain to the flow of fluids within a conduit, knowing the bottomhole flowing pressure (P_wf) and pressure profile in the wellbore are of undeniable significance. One would ask why not deploy downhole pressure gauges to obtain P_wf readings. Unfortunately, it is not …
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Superfluidity in a uniform two-dimensional Bose gas
… describes experimental studies regarding superfluidity in a two-dimensional gas of ultracold atoms trapped in a uniform potential. It is conceptually divided into three parts. In the first part we offer a theoretical discussion of a superfluid, first from a general perspective and then …
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Near-wall modeling of bubbly flows
Multiphase computational fluid dynamics (M-CFD) codes are gaining acceptance in the nuclear industry for the prediction of thermal-hydraulic behavior, offering the potential to improve the operation, economics, and safety of current systems, and enhance the design of next generation reactors. The …
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Numerical Investigations of Bubble Column Equipped with Vertical Internals in Different Arrangements
… for the design of these internals. Computational Fluid Dynamic (CFD) simulations provide an understanding of the complex two-phase flow enabling the study of the effects of the internals on the column hydrodynamics. In the present work, an Eulerian-Eulerian based two-fluid model (TFM) coupled with …
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Advanced framework for assessment and reduction of model form uncertainty of the closure laws in thermal-hydraulics codes
Accurate modeling of the two-phase flow phenomena is important for the safety analysis of light water reactors. The modeling approach must balance model resolution with computational feasibility. The direct implementation of local instant formulation is not practical for most engineering …
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Validation of a multiphase CFD model with mass transfer for xenon removal in molten salt reactor
… is dedicated to developing a computational fluid dynamics (CFD) model as a design tool for the xenon removal system in fueled salt reactors. Beginning with the review of gaseous fission product removal, the possibility and limitation of CFD with multiphase species transfer modeling are …
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An experimental analysis of two-fluid traffic model parameter sensitivity
The Two-Fluid traffic model is a tool used to measure the quality of service in city traffic networks. The model has been calibrated for the central business district of Roanoke, Virginia and the results have been compared to those from various other cities around the world. In addition, the …
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