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3–Water Nanofluid in Elliptic Duct
Published in Sarhan M. Musa, Nanoscale Flow, 2018
Buddakkagari Vasu, Rama Subba Reddy Gorla
Multiphase flow played a fundamental role for the duration of this study since the concepts involved in this topic dictated many of the preliminary calculations and assumptions made from which to base results. Multiphase flow is a flow with simultaneous presence of different phases, where phase refers to solid, liquid, or vapor state of matter. There are four main categories of multiphase flows: gas–liquid, gas–solid, liquid–solid, and three-phase flows. Further characterization is commonly done according to the visual appearance of the flow as separated, mixed, or dispersed flow. These are called flow patterns or flow regimes, and the categorization of a multiphase flow in a certain flow regime is comparable to the importance of knowing if a flow is laminar or turbulent in single-phase flow analysis (Thome [4]).
Single-Phase Incompressible Flow of Newtonian Fluid
Published in Henry Liu, Pipeline Engineering, 2017
A multiphase flow contains at least two separate phases, such as a liquid and a solid, a gas and a solid, a liquid and a gas, or two immiscible liquids. A single-phase flow, on the other hand, contains either a single liquid or gas without solids in it, or without any other immiscible liquid or gas. The flows of water, oil, natural gas, air, etc. are all examples of single-phase flow. Water laden with sediment particles or air bubbles is a two-phase flow. If the flow of water contains both air bubbles and sediment, it is a three-phase flow and so forth. A liquid with dissolved gas or another dissolved liquid, or with homogeneous suspension of very fine particles of solids, can be considered and treated as a single-phase flow, although in reality two phases are involved.
Measuring stiffness of soils in situ
Published in Fusao Oka, Akira Murakami, Ryosuke Uzuoka, Sayuri Kimoto, Computer Methods and Recent Advances in Geomechanics, 2014
Fusao Oka, Akira Murakami, Ryosuke Uzuoka, Sayuri Kimoto
During past decades, modelling multiphase flow through porous media has attracted researchers' attention due to its wide range of application in the areas of underground natural resource recovery, waste storage, petroleum reservoirs, mitigation of liquefaction, earth dams and earthquake engineering. The equations regarding the interaction between the solid and fluid were first developed for quasi-static conditions by Biot (1941), and were then extended to dynamic problems by Biot (1956) Later, the introduction of so-called "mixture theory" by Truesdell (1957) and the subsequent extensions of this theory by other researchers provided the opportunity to establish a new basis for Thermo-Hydro-Mechanical-Chemical analysis of porous media which includes the behaviourof multiphase fluids.
Assessment of Mixture and Eulerian Multiphase Models in Predicting the Thermo-Fluidic Transport Characteristics for Fly Ash-Water Slurry Flow in Straight Horizontal Pipeline
Published in Heat Transfer Engineering, 2019
Bibhuti Bhusan Nayak, Dipankar Chatterjee
A multiphase system can be classified broadly into four general categories such as the gas–liquid or liquid–liquid flow, gas–solid flow, liquid–solid flow and a combination of three phases. The liquid–solid two-phase flows have attracted considerable attention because of their numerous thermo-fluidic applications leading to significant amount of research in slurry transport [1]–[3]. Liquid–solid slurry flow represents the flow of a liquid continuum carrying the dispersed solid particles suspended and conveyed due to the drag and pressure forces exerted by the liquid on the particles. There are two distinct approaches available for the mathematical modeling of a multiphase flow system: (i) the Eulerian–Lagrangian approach and (ii) the Eulerian–Eulerian approach. The Lagrangian discrete phase model follows the Euler–Lagrange approach. A notable work is due to Niu and Lin [4] using the Eulerian–Lagrangian two-way coupling approach for predicting the slurry erosion in cavitated duct flows. In the Euler–Euler approach, the various phases are treated as interpenetrating continua. The volume of fluid model, mixture model and the Eulerian model (with two variants, granular for fluid–solid flows and non-granular for fluid–fluid flows) are the three possibilities in the Euler–Euler approach.
Research on hydrate formation and prevention during deepwater gas wells cleanup stage
Published in Petroleum Science and Technology, 2018
Wenyuan Liu, Jinqiu Hu, Xiangfang Li, Zheng Sun, Fengrui Sun, Yunjian Zhou
There are many researches on hydrate formation and blockage under multiphase flow conditions in the pipelines. According to the different composition of flowing medium, the gas-liquid-solid multiphase flow system can be divided into oil-dominated, gas-dominated and water-dominated system. For oil-dominated system, Aman et al. (2011), Anklam et al. (2008), and McCulfor et al. (2011) demonstrated that the primary adhesion of hydrate particles in the oil phase is the capillary force through experiments and theoretical analysis. Colombel et al. (2009) combined the contact-induced aggregation with the shear-limited aggregation mechanism to explain the hydrate particle aggregation phenomenon. For gas-dominated system, Rao et al. (2013) studied the hydrates deposition process in the saturated water-containing methane system. Di Lorenzo et al. (2014a, 2014b, 2018) experimented and the results showed that with the increase of the hydrate volume fraction, the pipeline pressure drop increases, and the deposition-detachment of the hydrate particles have a significant effect on the pressure changes. For water-dominated system, Joshi et al. (2013), Sakurai et al. (2014), Balakin et al. (2009, 2011) used experimental and theoretical methods to study the hydrate formation rate and deposition characteristics under different multiphase flow patterns and the effect of hydrate formation on pipe flow. The above research makes people further understand the hydrate growth and deposition law in pipelines.
Experimental investigation on the effect of the mode of deposition on the pore-access size distribution of sand
Published in Geomechanics and Geoengineering, 2018
On the other hand, generally the knowledge of the pore-access size distribution of soils is of great importance for modelling multiphase flow and transport phenomena at the pore scale (Feia et al. 2014); various applications can be found in hydrology for groundwater flow studies, in geoenvironmental engineering for soil contamination problems and in civil engineering for the design of embankment dam filters.