CFD-DEM simulation of fluidized particle flow in a periodic domain for (a) a dry case and (b–e) wet cases with increasing Bo , demonstrating the difference in heterogeneity caused by gas-solid flow instabilities and agglomeration due to liquid bridging. In that case, the sparse solid particles are dispersed all over. This regimes is referred to as Pneumatic conveying (see Figure 13.9). Fig. 13.9 The flow patterns in solid-liquid flow. One of the main difference between the liquid and gas flow in this category is the speed of sound. particles. The solid particles, whose sizes vary depending on applications, prompt the mixing of gas and liquid, and they sometimes also serve as catalyst materials. In general, there are four basic flow regimes in concurrent gas-liquid flow through packed beds: bubbly, trickle, pulse and spray. Each regime has its own unique characteristics .
Flow of interacting particulates where there is negligible interaction with surrounding gas or liquid. Gas, liquid and solid in combination of any flow regimes. Conveyors, hoppers, filling. Deep well, evaporator, gas-oil-water separator, two-phase fluidized bed with solid catalysts. Euler-Euler Track 1: Dense Gas-Solid and Granular Flows NETL 2006 Multiphase Flow Workshop Morgantown, WV June 6-7, 2006 Paul Mort – P&G, Chair Joe McCarthy – University of Pittsburgh, Co-Chair
3 Fluid Dynamics of Gas Solid Fluidized Beds Germán González Silva 1, Natalia Prieto Jiménez 1 and Oscar Fabio Salazar State University of Campinas Brazil 1. Introduction Fluidization refers to the contact between a bed of solids and a flow of fluid. The flow regimes are referred to the arrangement of the fluids. The main difference between the liquid–liquid flow to gas-liquid flow is that gas density is extremely lighter than the liquid density. For example, water and air flow as oppose to water and oil flow. solid particle volume fraction profiles were able to predict various flow regimes at each specific gas inlet velocity. The velocities of gas phase and solid phase were shown in this literature to provide the idea of the regime characteristic. The novel flow regime was appeared at gas inlet velocity from 0.75 m/s to 1 m/s.
Two-Phase Gas/Liquid Pipe Flow Ron Darby PhD, PE Professor Emeritus, Chemical Engineering Texas A&M University . Gas-Liquid Flow Regimes ... Re Fr 0. HOMOGENEOUS GAS-LIQUID PIPE FLOW Energy Balance (Eng’q Bernoulli Eqn) where 2 m 2 GL m m 2 G 2 f G dx dz G ! J The dense and extrusion flow regimes for gas-solid flow have been analyzed in an effort to produce design guidelines for the frictioiial losses in such systems. The dense phase iegime has been designated as loadings of solid to gas greater than 10, with extrusion flow having a much higher value,
Following another approach, Leung (1980), Klinzing (1981) and Yang (1983) proposed flow regime maps of gas-solids transport in which gas velocity was plotted against solids flux, with gas-solid transport divided into dense-phase flow and dilute-phase flow regimes. Fluidization and Flow Regimes of Titaniferous Solids Adam Luckos* and Paul den Hoed Mintek, Private Bag X3015, Randburg 2125, South Africa Physical properties of ilmenite and titania slag particlessproperties such as particle density, bulk density, packed-bed voidage and sphericityshave been determined for narrow size fractions
In this work, the impact of the vertical internals on the flow regimes and their transition velocities has been studied in a 0.14 m inside diameter gas–solid fluidized bed. The identification of the flow regimes was accomplished statistically (standard deviation) and chaotically (Kolmogorov entropy) by analyzing the pressure drop fluctuations. Re p = α g ρ g d | u g − u p ... The gas–solid flow regimes including slugging bed, jet-in-fluidized bed, spout fluidization, and intermediate are simulated to investigate the accuracy of the present modeling framework for predicting different gas–solid behaviors. The conclusions can be drawn as follows: Solid-Particles Flow Regimes in Air/Water Stratified Flow in a Horizontal Pipeline ... The effects of different experimental conditions, such as gas velocity, solid-particles concentration, and particle size, are investigated in this study. Six main solid-particles flow regimes in horizontal air/water flow are identified, and can be ...
– Immiscible/Stratified flow Every type can have various flow regimes Flow regimes Separated Disperse Liquid-liquid Liquid-solid Pneumatic Transport, Hydro transport, or Slurry Fluidized Bed Sedimentation Stratified / Free-Surface Flow Slug Flow Bubbly, Droplet, or Particle-Laden Flow Flow regimes in vertical gas+iquid flow 0.1 1 10 100 1 10 ... There are many operations in which two phases must be separated. These separations may be gas-liquid, gas-solid, liquid-liquid or liquid-solid, with several factors such as relative densities, gravity, fluid velocities and the shape of particles and/or droplets influence the phase separability. In this article we present the fundamentals of these separations and provide the Stoke's ...
Flow Regimes For low Reynolds numbers the behavior of a fluid depends mostly on its viscosity and the flow is steady, smooth, viscous, or laminar and n = 1. For high Reynolds numbers the momentum of the fluid determines its behavior more than the viscosity and the flow is unsteady, churning, roiling, or turbulent and n = 2. Multiphase flow regimes • User must know a priori the characteristics of the flow. • Flow regime, e.g. bubbly flow, slug flow, annular flow, etc. • Only model one flow regime at a time. • Predicting the transition from one regime to another possible only if the flow regimes can be predicted by the same model. This is not always the case. The energy of the bi-spectrum is bigger than that of other flow regimes for the very fast gas flow rate. The structure of the bi-spectrum is simple with a peak at the lower frequency. FIGURE 9 shows the bi-spectrums of the void fraction from sensor No.2 for four flow regimes.
A gas-solid flow is characterized by the flow of gases with suspended solids. ... where ρ p is the material density of the particle and Re p is the particle Reynolds Number based on the relative velocity, ... The flow behaves like slug flow of the gas-liquid flow regimes. Work directly addresses Section 3 on Liquid-Solid Flows of DOE Multiphase Flow Roadmap (e.g. Fischer-Tropsch synthesis) and also addresses Sections 1 and 2 on Gas-Solid Flow regimes for intermediate Stokes numbers Shell Oil is partially supporting this work as part of the NSF-I/UCRC center in Particulate modifications in order to get a more approximate representation of gas-solid flow hydrodynamics. Yang et al. (2003) drag model, present a refinement in determining momentum transfer specifically when the gas-solid flow attains a dilute regime (Wang and Liu 2010; Loha, Chattopadhyay, and Chatterjee 2012).
Simulation of different gas–solid flow regimes using a drag law derived from lattice Boltzmann simulations Yeping Xie1, Yongquan Liu1, Linmin Li2, Chang Xu2 and Baokuan Li3 Abstract Gas–solid flows are widely found in various industrial processes, e.g. chemical engineering and sand ingestion test for Chaotic behavior of gas-solids flow in the riser of a laboratory-scale circulating fluidized bed Citation for published version (APA): ... models cannot be verified over the wide range of flow regimes under which CFB risers may be operated. Stringer (1989) suggested that a fluidized bed might be in- ... the gas kinematic viscosity (m*/s), Re ... The dynamics of gas-solids suspensions in the riser of a circulating fluidized bed (CFB) are particularly important in the control, design, and scale-up of efficient new reactors. A cold model of a circulating fluidized bed with a 0.030-m-ID, 2.77-m-high riser was operated in a wide range of ...
Effects of pressure and temperature on flow regimes in gas—Solid fluidization systems Effects of pressure and temperature on flow regimes in gas—Solid fluidization systems Bi, H. T.; Grace, J. R. 1996-12-01 00:00:00 The effects of operating temperature and pressure on the flow regimes of gas—solids fluidization are predicted based on the recently published flow regime diagram of Bi and ... phases as generally is the case in gasŽ.solid flow is large Ž.Koch, 1990 . In numerical simulations of gas solid fluidized-beds, it is still unclear which correlation should be used for describing the interphase drag coefficients. The two widely used models are the Wen and Yu equation and a hybrid model, suggested
Liquid-solid flow represents the flow of a liquid continuum carrying dispersed solid panicles suspended and conveyed by the drag and pressure forces of the liquid acting on the particles. The aim of those slurry flows may be the transport of bulk-solids or physical or chemical processes between carrier liquid and solids. between stratified and annular flow, or between the dis- persed liquid or dispersed gas flow regimes, and these are differences of considerable practical concern. In this work a mechanistic model is developed for the unambiguous analytical prediction of transition between flow regimes. This approach also provides considerable in- In order to fill in the existing gap, an attempt has been made in this work to study experimentally the average gas holdup and solid-liquid mass transfer in a bubble column using both Newtonian and non-Newtonian fluids as the continuous phase.
In this work, the impact of the vertical internals on the flow regimes and their transition velocities has been studied in a 0.14 m inside diameter gas–solid fluidized bed. Model-Based Optimization of Industrial Gas-Solid Reactors ... that take place in these reactors include flow of gases through porous media, heat transfer between the gases, ... of mathematical models for industrial scale gas-solid re-actors, related software tools (Virtual SinterTM, ...
IDENTIFICATION OF GAS–SOLID TWO-PHASE FLOW REGIMES USING HILBERT–HUANG TRANSFORM AND NEURAL-NETWORK TECHNIQUES H. L. Hu,1,2 J. Zhang,1 J. Dong,1 Z. Y. Luo,1 and T. M. Xu2 1State Key Laboratory ... Continuum Approaches for Describing Solid-Gas and Solid-Liquid Flow P. Diamond J. Harvey H. Levine P Steinhardt R. Westervelt February 1992 JSR-91-310 Approved for public release; distribution unlimited. This report was prepared as an account of work sponsored by an agency of the United States Government. flow regimes possess a characteristic combination of the investigated quantitative parameters. A ... = Re L /4. For the gas flow, the superficial and bulk velocities are similar, due to the relatively small ... (gas-liquid-solid) in the line of sight of the optical
Types of Multiphase flow. The most common class of multiphase flows are two-phase flows, and these include Gas-Liquid Flow, Gas-Solid Flow, Liquid-Liquid Flow and Liquid-Solid Flow. These flows are the most studied, and are of most interest in the context of industry. Different patterns of multiphase flow are known as flow regimes. Keywords: Flow Regimes, Artificial Intelligence, Natural Logarithmic Normalization. 1. Introduction Multiphase flow refers to the simultaneous flow of two phases or more and they can be liquid, gas, solid, two components from the same phase such oil and water, or two phases single component such as water vapor and liquid.
Numerical simulation of gas-solid flow in ducts by CFD techniques R. K. Decker1, D. Noriler2, H. F. Meier2 & M. Mori1 1Chemical Process Department, State University of Campinas, Brazil 2Chemical Engineering Department, Regional University of Blumenau, Brazil Abstract Numerical models are nowadays used on a large scale for the simulation of About Cookies, including instructions on how to turn off cookies if you wish to do so. By continuing to browse this site you agree to us using cookies as described in About Cookies.. Remove maintenance message
The effects of solid particle and liquid properties, bed and gas orifice sizes, and static bed height on the flow regimes and transitions were investigated. Results show that the behavior of gas bubbles and wall effect affect the flow regimes and transitions. simulation of gas fluidization (Xu and Yu, 1997; Yu and Xu, 2003) and raceway phenomena (Xu et al., 2000). This paper extends that approach to investigate the gas-solid flow in a blast furnace . The results are analyzed in terms of solid flow patterns, flow field, and force structure. 10 MODEL DESCRIPTION Discrete particle simulation A particle ...
Read "Theoretical analysis of the flow regimes and their characteristics in vertically flowing gas–solids suspensions, Chemical Engineering Journal" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. A model for gas-solid flow in a horizontal duct with a smooth merge of rapid-intermediate-dense flows ... we also present the definition of boundaries between rapid-intermediate-dense flow regimes based on the dimensionless shear rate ( ?), and a modified Reynolds number (Re). ... (Re). We have shown that the intermediate flow regime can be ...
A Generalized Flow Regime Diagram for Fluid-Solid Vertical Transport Xiaotao T. Bi University of British Columbia, ... "A Generalized Flow Regime Diagram for Fluid-Solid Vertical Transport" in "10th International Conference on ... Flow patterns and flow regimes in gas-solids two-phase fluidization and vertical flow Gas-solid flow in vertical tubes. Authors. Jorge A. Pita, Mobil Research and Development Corporation, Paulsboro, NJ 08066; Search for more papers by this author. Sankaran Sundaresan. Mobil Research and Development Corporation, Paulsboro, NJ 08066; Search for more papers by this author. WHY CHOOSE SOLIDWORKS FLOW SIMULATION? A BUYER’S GDUE I OVERVIEW SOLIDWORKS® Flow Simulation software makes it easier and faster to determine the impact of liquid or gas flow on your product designs before any parts are made.
Laminar flow has been shown by experiment to exist at Re < 2,000 and turbulent flow at Re > 4,000. Reynolds numbers between 2,000 and 4,000 are in a transition zone, and thus the flow may be either laminar or turbulent. TWO-PHASE FLOW: Two-phase flow of liquid and gas is a very complex physical process. effects of gas flow, the stickiness between particles, the rotational speed of screws, and different designs are depicted in terms of gas-solid flow pattern, overall bed pressure drop and solid flowrate. The results show that the effect of gas flow is insignificant on gas-solid flow pattern due to the small gas-solid inter- ANALYSIS AND CORRELATION OF HEAT-TRANSFER COEFFICIENT AND FRICTION FACTOR DATA FOR DILUTE GAS-SOLID SUSPENSIONS ... Flow Regimes ..... 29 Analytical Models ... related thermodynamic and transport properties of gas-solid suspensions were also re- viewed.
Gas Solid Flow Regimes With Re © 2020 Effects of pressure and temperature on flow regimes in gas—Solid fluidization systems Effects of pressure and temperature on flow regimes in gas—Solid fluidization