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Numerical Modeling And Simulation Of Particulate Fouling On Structured Heat Transfer Surfaces Using Multiphase Eulerian Lagrangian Les
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Book Synopsis Numerical modeling and simulation of particulate fouling on structured heat transfer surfaces using multiphase Eulerian-Lagrangian LES by : Robert Kasper
Download or read book Numerical modeling and simulation of particulate fouling on structured heat transfer surfaces using multiphase Eulerian-Lagrangian LES written by Robert Kasper and published by Cuvillier Verlag. This book was released on 2021-04-30 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Durch die gezielte Strukturierung von wärmeübertragenden Oberflächen, wie beispielsweise durch Dellen oder Rippen, kann die örtliche Turbulenz und damit die thermische Durchmischung gesteigert werden. Dies kann die Effizienz von Wärmeübertragern oder Bauteilkühlsystemen erheblich erhöhen. Derartige Oberflächenstrukturrierungen begünstigen jedoch das Partikelfouling, daher die Ablagerung suspendierter Partikel, wie z.B. Sand, Schlamm oder Korrosionsprodukte. Gegenstand dieser Arbeit ist die Entwicklung eines universellen, numerischen CFD-Verfahrens zur Vorhersage des partikulären Foulings auf strukturierten Oberflächen, speziell Dellenoberflächen. Das entwickelte Verfahren basiert auf einer Kombination des Lagrangian-Particle-Trackings zur Beschreibung der dispersen Phase (Foulingpartikel), sowie räumlich und zeitlich aufgelöster Large-Eddy Simulation für die Berechnung der kontinuierlichen Phasen (Trägerfluid). Dieses Vorgehen ermöglicht nicht nur die Auswertung der infolge der Partikelablagerungen verminderten thermo-hydraulischen Effizienz, sondern auch die Untersuchung der Wechselwirkungen zwischen turbulenten Strömungsstrukturen und dem partikulärem Fouling. Dadurch kann gezeigt werden, dass die Verwendung von sphärischen Dellen als Oberflächenstrukturen nicht nur aus thermo-hydraulischer Sicht die optimale Wahl darstellt, sondern auch eine substantielle Verminderung des Partikelfoulings begünstigt. The application of structured heat transfer surfaces, such as dimples or ribs, increase the local turbulence and thus thermal mixing. This can improve the efficiency of heat exchangers or cooling systems significantly. However, structured surfaces are known to promote particulate fouling, hence the unwanted accumulation and deposition of suspended particles (e.g., silt, sludge or iron oxide). The scope of this work is the development of a universal numerical CFD method for the prediction of particulate fouling, especially on dimpled surfaces. The proposed approach is based on a combination of the Lagrangian point-particle tracking for the description of the disperse phase (fouling particles), and spatially and temporally resolved large-eddy simulations for the calculation of the continuous phase (carrier fluid). This approach allows not only the evaluation of the reduced thermo-hydraulic efficiency due to particle deposition, but also the investigation of the interaction between turbulent flow structures and the particulate fouling. It can be shown that the usage of spherical dimples as surface structures is not only the optimal choice from a thermo-hydraulic point of view, but also favors a substantial reduction of particulate fouling.
Book Synopsis Modeling and Simulation of Particle Dispersal by Shock and Detonation Waves by : Yue Ling
Download or read book Modeling and Simulation of Particle Dispersal by Shock and Detonation Waves written by Yue Ling and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, we develop a rigorous simulation approach for unsteady compressible multiphase flow involving shock and detonation waves, and apply this approach to investigate a sequence of problems of particle dispersal by shock and detonation waves. First, the particle dispersal in a one-dimensional shock-tube is considered. The primary focus is on how the existence of particles causes the flow to transition from the frozen to the equilibrium limit. The second problem entails the investigation and resolution of numerically induced particle-number-density fluctuations in Eulerian-Lagrangian simulations of multiphase flow. Guidelines to reduce the amplitude of the fluctuations are proposed that can be easily applied in practice. The third problem considered in the dissertation is the modeling and analysis of particle interaction with shock and blast waves. The study clearly demonstrates the importance of the unsteady force and heat transfer in the interaction of particles with shock and blast waves. Finally, we consider the problem of particle dispersal by blast waves. The focus is on investigating the interactions between particles with the complex wave system. The unsteady contributions to force and heat-transfer are again found to be substantial.
Book Synopsis Hybrid Particle Laden Flow Modelling by : David Schellander
Download or read book Hybrid Particle Laden Flow Modelling written by David Schellander and published by GRIN Verlag. This book was released on 2013-09-20 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: Doctoral Thesis / Dissertation from the year 2013 in the subject Engineering - Mechanical Engineering, grade: 1, University of Linz (Department on Particulate Flow Modelling), language: English, abstract: The numerical hybrid model EUgran+, which is an Eulerian-Eulerian granular phase model extended with models from the Eulerian-Lagrangian model for dense rapid particulate flows, is modified to account for poly-dispersed particle diameter distributions. These modifications include the implementation of I) a new poly-dispersed drag law and of II) new particle boundary conditions distinguishing between sliding and non-sliding particle-wall collisions and III) a new implementation of the population balance equation in the agglomeration model using the Eulerian-Lagrangian approach, referred to as Bus-stop model. Further, the applicability of the EUgran+ model is extended to cover dilute to dense poly-disperse particulate flows. Furthermore, this provides an improvement in the numerical simulation of dust separation and the formation of particle strands in industrial scale cyclones. In this PHD thesis, the EUgran+Poly model is validated at 3 specific cases with different mass loadings: I) poly-dispersed particle conveying in a square pipe with a 90 degree bend at low mass loading (L = 0:00206); II) a particle conveying case in a rectangular pipe with a double-loop at high mass loading (L = 1:5); III) in a vertical pipe the implementation of the agglomeration model is validated. To show the applicability of the presented models a simulation of an industrial cyclone in experimental scale is presented. The validation and application shows that considering a poly-disperse Eulerian-Eulerian granular phase improves the accordance of the simulation results with measurements significantly. Finally, the hybrid model is a good compromise for a computational efficient simulation of particulate transport and separation with different mass loading regimes.
Book Synopsis Particulate Phenomena and Multiphase Transport by : T. Nejat Veziroğlu
Download or read book Particulate Phenomena and Multiphase Transport written by T. Nejat Veziroğlu and published by . This book was released on 1988 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Impact of Saltation on the Modeling of Heat Transfer for High Reynolds Number Particle-Laden Flows by : Zachary Vickerson
Download or read book Impact of Saltation on the Modeling of Heat Transfer for High Reynolds Number Particle-Laden Flows written by Zachary Vickerson and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The heat transfer performance of a particle-laden flow has design implications for a wide range of industries. The objective of this thesis is to improve a previously proposed Eulerian CFD model for the heat transfer of a highly mass loaded high Reynolds number particle-laden flow. Experimentation had shown that a layer of copper particles accumulated on the bottom of the flow channel. The previous two field (gas + dispersed particle) model was extended to include a third field to represent this particle layer. Mass transfer models were developed to account for the deposition of particles from dispersed to particle layer and from particle layer back to dispersed. New drag and heat transfer models were developed to account for the interaction of the particle layer field with the core gas flow. The model is tested and implemented using NPHASE, an Eulerian Multiphase flow CFD solver, and suggestions for improvement are proposed.
Download or read book OpenFOAM® written by J. Miguel Nóbrega and published by Springer. This book was released on 2019-01-24 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains selected papers of the 11th OpenFOAM® Workshop that was held in Guimarães, Portugal, June 26 - 30, 2016. The 11th OpenFOAM® Workshop had more than 140 technical/scientific presentations and 30 courses, and was attended by circa 300 individuals, representing 180 institutions and 30 countries, from all continents. The OpenFOAM® Workshop provided a forum for researchers, industrial users, software developers, consultants and academics working with OpenFOAM® technology. The central part of the Workshop was the two-day conference, where presentations and posters on industrial applications and academic research were shown. OpenFOAM® (Open Source Field Operation and Manipulation) is a free, open source computational toolbox that has a larger user base across most areas of engineering and science, from both commercial and academic organizations. As a technology, OpenFOAM® provides an extensive range of features to solve anything from complex fluid flows involving chemical reactions, turbulence and heat transfer, to solid dynamics and electromagnetics, among several others. Additionally, the OpenFOAM technology offers complete freedom to customize and extend its functionalities.
Book Synopsis Multiphase Particulate Systems in Turbulent Flows by : Wioletta Podgórska
Download or read book Multiphase Particulate Systems in Turbulent Flows written by Wioletta Podgórska and published by CRC Press. This book was released on 2019-09-17 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiphase Particulate Systems in Turbulent Flows: Fluid-Liquid and Solid-Liquid Dispersions provides methods necessary to analyze complex particulate systems and related phenomena including physical, chemical and mathematical description of fundamental processes influencing crystal size and shape, suspension rheology, interfacial area of drops and bubbles in extractors and bubble columns. Examples of mathematical model formulation for different processes taking place in such systems is shown. Discussing connections between turbulent mixing mechanisms and precipitation, it discusses influence of fine-scale structure of turbulence, including its intermittent character, on breakage of drops, bubbles, cells, plant cell aggregates. An important aspect of the mathematical modeling presented in the book is multi-fractal, taking into account the influence of internal intermittency on different phenomena. Key Features Provides detailed descriptions of dispersion processes in turbulent flow, interactions between dispersed entities, and continuous phase in a single volume Includes simulation models and validation experiments for liquid-liquid, gas-liquid, and solid-liquid dispersions in turbulent flows Helps reader learn formulation of mathematical models of breakage or aggregation processes using multifractal theory Explains how to solve different forms of population balance equations Presents a combination of theoretical and engineering approaches to particulate systems along with discussion of related diversity, with exercises and case studies
Book Synopsis High-Speed Particle-Laden Flows by : Sean Lin Sheng Davis
Download or read book High-Speed Particle-Laden Flows written by Sean Lin Sheng Davis and published by . This book was released on 2015 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-speed particle-laden flows are studied through a combination of high-order Eulerian Lagrangian (EL) method development, multi-scale modeling and the analysis of normal, shear and wake instabilities. The EL code is based on a Weighted Essentially Non-Oscillatory (WENO) discretization, which captures discontinuities sharply while ensuring higher-order resolution in smoother areas. The favorable characteristics of WENO methods are extended to the EL framework with an Essentially Non-Oscillatory (ENO) scheme to interpolate the carrier phase from the Eulerian grid to the particle location. A high fidelity multi-scale method is introduced that couples full-resolution micro-scale statistics with the macro-scale. Using a Taylor expansion of the drag correction factor and Reynolds averaging of the particle transport equation, the Subgrid Particle Reynolds Stress Equivalent (SPARSE) model is derived. A mantle is constructed to provide closure for the particle drag and subgrid particle dynamics models. The efficacy of several metamodeling techniques in building a mantle with a target uncertainty using the least number of support points is compared. Grid aligned shocks at high mach numbers create normal instabilities that bleed into the particle phase. These so-called ``carbuncles'' have a predominantly numerical nature and can be mitigated by adjusting the nonlinear WENO power parameters. Instabilities that are induced by the accelerated flow behind a moving shock in the wake of a cloud of particles are analyzed. The initial shape, orientation and dimensionality of the particle cloud with respect to an oncoming normal shock determines the particle dispersion at later times. Dispersion characteristics are matched with results reported in literature. Streamlined cloud shapes exhibit a lower dispersion as compared to clouds with an initially blunt shape. Lower particle number density areas away from the heavily populated cloud core accelerate more. Growth rates of shear instabilities computed with the EL code are compared with the results of a linear stability analysis of particle-laden shear layers. The growth rate of shear layers with non-uniformly laden low Stokes number particles is greater than an unladen shear layer whereas a shear layer with high Stokes number particles dampens the growth.
Book Synopsis Numerical Simulation of Flow and Heat Transfer in Particulate Systems by : Nasser Saghatoleslami
Download or read book Numerical Simulation of Flow and Heat Transfer in Particulate Systems written by Nasser Saghatoleslami and published by . This book was released on 1996 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dispersion and Deposition of Heavy Particles in Turbulent Flows by : Chunyu Jin
Download or read book Dispersion and Deposition of Heavy Particles in Turbulent Flows written by Chunyu Jin and published by . This book was released on 2012 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modelling of Particulate Fouling on Heat Transfer Surfaces by : François Cussac
Download or read book Modelling of Particulate Fouling on Heat Transfer Surfaces written by François Cussac and published by . This book was released on 2007 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Particulate and Multiphase Processes by : Teoman Ariman
Download or read book Particulate and Multiphase Processes written by Teoman Ariman and published by CRC Press. This book was released on 1987 with total page 990 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comprehensive Dissertation Index by :
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1989 with total page 1116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulations of Turbulent Dispersion Around Buildings Via a Lagrangian Stochastic Particle Model by :
Download or read book Numerical Simulations of Turbulent Dispersion Around Buildings Via a Lagrangian Stochastic Particle Model written by and published by . This book was released on 1995 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes a numerical modeling approach that can be used to provide estimates of air concentrations due to emissions at industrial sites or other sites where buildings may have an important impact on the dispersion patterns. The procedure consists of two sequential steps: (i) Prediction of mean flow and turbulence fields via a turbulent flow model; and, (ii) Employment of the calculated flow and Turbulence fields to drive a Lagrangian Stochastic Particle Model. Two flow scenarios in which the approaching mean wind is assumed to be at 90° and 30° to the building complex are used as input to the Lagrangian model. The first calculation is based on an earlier transport and diffusion simulation that employed an existing particle-in-cell flux-gradient dispersion model. The second simulation is used to demonstrate the strong spatial variations that the concentration field exhibit within the highly complex separation zones of building wakes. The relationship between concentration levels and toxic load are discussed for the case of a chemical spill.
Book Synopsis Eulerian-Lagrangian Approach for Modeling and Simulations of Turbulent Reactive Multi-phase Flows Under Gas Turbine Combustor Conditions by : Mouldi Chrigui
Download or read book Eulerian-Lagrangian Approach for Modeling and Simulations of Turbulent Reactive Multi-phase Flows Under Gas Turbine Combustor Conditions written by Mouldi Chrigui and published by . This book was released on 2005 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book わたしの碁(木谷実選集) 月報 : 第1卷-第2卷 written by and published by . This book was released on 1968 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multiphase Flow Analysis Using Population Balance Modeling by : Guan Heng Yeoh
Download or read book Multiphase Flow Analysis Using Population Balance Modeling written by Guan Heng Yeoh and published by Butterworth-Heinemann. This book was released on 2013-08-19 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by leading multiphase flow and CFD experts, this book enables engineers and researchers to understand the use of PBM and CFD frameworks. Population balance approaches can now be used in conjunction with CFD, effectively driving more efficient and effective multiphase flow processes. Engineers familiar with standard CFD software, including ANSYS-CFX and ANSYS–Fluent, will be able to use the tools and approaches presented in this book in the effective research, modeling and control of multiphase flow problems. - Builds a complete understanding of the theory behind the application of population balance models and an appreciation of the scale-up of computational fluid dynamics (CFD) and population balance modeling (PBM) to a variety of engineering and industry applications in chemical, pharmaceutical, energy and petrochemical sectors - The tools in this book provide the opportunity to incorporate more accurate models in the design of chemical and particulate based multiphase processes - Enables readers to translate theory to practical use with CFD software
