scholarly journals An extension of the multiple marker algorithm for study of phase separation problems at the mesoscale

2021 ◽  
Vol 347 ◽  
pp. 00025
Author(s):  
Quinn G. Reynolds ◽  
Oliver F. Oxtoby ◽  
Markus W. Erwee ◽  
Pieter J.A. Bezuidenhout
Keyword(s):  
Multiphase Flow ◽  
Immiscible Liquids ◽  
Performance Benchmarking ◽  
Flow Problems ◽  
Interfacial Surface ◽  
Multiphase Fluid Flow ◽  
Multiphase Fluid ◽  
Volume Of Fluids ◽  
Small Bubbles ◽  
Desirable Effect

Multiphase fluid flow is an active field of research in numerous branches of science and technology. An interesting subset of multiphase flow problems involves the dispersion of one phase into another in the form of many small bubbles or droplets, and their subsequent separation back into bulk phases after this has occurred. Phase dispersion may be a desirable effect, for example in the production of emulsions of otherwise immiscible liquids or to increase interfacial surface area for chemical reactions, or an undesirable one, for example in the intermixing of waste and product phases during processing or the generation of foams preventing gas-liquid decoupling. The present paper describes a computational fluid dynamics method based on the multiple marker front-capturing algorithm – itself an extension of the volume-of-fluids method for multiphase flow – which is capable of scaling to mesoscale systems involving thousands of droplets or bubbles. The method includes sub-grid models for solution of the Reynolds equation to account for thin film dynamics and rupture. The method is demonstrated with an implementation in the OpenFOAM® computational mechanics framework. Comparisons against empirical data are presented, together with a performance benchmarking study and example applications.

scholarly journals Pressure Drop Determination for Multiphase Flow in a Vertical Well Tubing

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Sarah A Akintola
Keyword(s):  
Pressure Drop ◽  
Multiphase Flow ◽  
Flow Model ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Modified Model ◽  
Multiphase Fluid Flow ◽  
Fluid Properties ◽  
Multiphase Fluid

Several studies have been carried out, by researchers to predict multiphase flow pressure drop in the oil and gas industry, but yet there seems to be one being generally acceptable for accurate prediction of pressure drop. This is as a result of some constraints in each of these models, which makes the pressure drop predicted by the model far from accurate when compared to measured data from the field. This study is aimed at developing a multiphase fluid flow model in a vertical tubing using the Duns and Ros flow model. Data from six wells were utilized in this study and results obtained from the Modified model compared with that of Duns and Ros model along other models. From the result, it was observed that the newly developed model (Modified Duns and Ros Model) gives more accurate result with a R-squared value of 0.9936 over the other models. The Modified model however, is limited by the choice of correlations used in the computation of fluid properties.

Investigation of Paraffin Deposition During Multiphase Flow in Pipelines and Wellbores—Part 2: Modeling

2001 ◽  
Vol 123 (2) ◽  
pp. 150-157 ◽  
Author(s):  
Mandar S. Apte ◽  
Ahmadbazlee Matzain ◽  
Hong-Quan Zhang ◽  
Michael Volk ◽  
James P. Brill ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Multiphase Flow ◽  
Molecular Diffusion ◽  
Diffusion Theory ◽  
Wax Deposition ◽  
Flow Energy ◽  
Multiphase Fluid Flow ◽  
Multiphase Fluid ◽  
The University ◽  
Solid Liquid

A Joint Industry Project to investigate paraffin deposition in multiphase flowlines and wellbores was initiated at The University of Tulsa in May 1995. As part of this JIP, a computer program, based on the molecular diffusion theory, was developed for prediction of wax deposition during multiphase flow in pipelines and wellbores. The program is modular in structure and assumes a steady-state, one-dimensional flow, energy conservation principle. This paper will describe the simulator developed for predicting paraffin deposition during multiphase flow that includes coupling of multiphase fluid flow, solid-liquid-vapor thermodynamics, multiphase heat transfer, and flow pattern-dependent paraffin deposition. Predictions of the simulator are compared and tuned to the experimental data by adjusting the film heat transfer and diffusion coefficients and the thermal conductivity of the wax deposit.

Physics of the Interaction of Ultrasonic Excitation With Nucleate Boiling

2013 ◽  
Vol 136 (3) ◽  
Author(s):  
Sreenath Krishnan ◽  
Sarit K. Das ◽  
Dhiman Chatterjee
Keyword(s):  
Mechanistic Model ◽  
Interactive Effect ◽  
Nucleate Boiling ◽  
Ultrasonic Frequency ◽  
Pressure Amplitude ◽  
Surface Parameter ◽  
Site Density ◽  
Multiphase Fluid Flow ◽  
Ultrasound Assisted ◽  
Multiphase Fluid

Physics of ultrasound-assisted augmentation of saturated nucleate boiling through the interaction of multiphase fluid flow is revealed in the present work. Different regimes of influence of ultrasound, ranging from augmentation to deterioration and even no effect, as reported in literature in a contradictory fashion, have been observed. However unlike the previous studies, here it has been clearly demonstrated that this apparent anomaly lies in the different natures of interactions between the influencing parameters like heat flux, ultrasonic frequency, and pressure amplitude. The present results clearly bring out an interactive effect of these operating parameters with surface parameter like surface roughness. A mechanistic model unifying all these parameters has been presented to explain quantitatively the physics of the interaction. The model-based predictions match experimental results quite well suggesting the validity of the hypothesis on liquid–vapor-surface interaction through the process of nucleation and its site density, on which the model is built, and thus revealing the underlying physics.

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