| Description |
1 online resource (211 pages) : illustrations |
| Series |
Fortschritte Naturstofftechnik |
|
Fortschritte Naturstofftechnik.
|
| Contents |
Intro -- Abstract -- Kurzfassung -- Acknowledgments -- Table of Contents -- Symbols -- Abbreviations -- 1 Introduction -- 2 State of the Art -- 2.1 Separation Process in Combine Harvester Cleaning Devices -- 2.1.1 Design and Functionality of Combine Harvester Cleaning Devices -- 2.1.2 Fundamentals of Separation Process in Combine Cleaning Devices -- 2.1.3 Influences on Separation Process and Evaluation of Separation Success -- 2.1.3.1 Classification of Parameters -- 2.1.3.2 Basic Material and Particle Properties -- 2.1.3.3 Interphase Properties -- 2.1.3.4 Bulk Properties |
|
2.1.3.5 Process Related Characteristic Properties -- 2.1.4 Fluid Mechanical Process Characterization -- 2.1.4.1 Type of Multiphase Flow -- 2.1.4.2 Dispersed Multiphase Flow Regime -- 2.1.4.3 Fluid Forces Acting on Particles -- 2.1.4.4 Turbulence -- 2.2 Numerical Methods for Dispersed Multiphase Flows -- 2.2.1 Fundamental Description -- 2.2.1.1 Specification of the Flow Field and Frame of Reference -- 2.2.1.2 Importance of Interaction Mechanism -- 2.2.1.3 Resolution of Length Scales -- 2.2.2 Approaches with Non-Resolved Particle Surface -- 2.2.2.1 Euler -- Euler Approach |
|
2.2.2.2 Euler-Lagrange Approaches -- 2.2.3 Approaches with Resolved Particle Surface -- 2.3 Applications of Numerical Methods to Grain-MOG Separation Process -- 2.4 Summary of Literature Review and Conclusions -- 3 Approach and Method -- 3.1 Objectives and Approach -- 3.2 Basics of the Coupled CFD-DEM Method -- 3.2.1 CFD for the Fluid-Phase -- 3.2.1.1 Governing Equations -- 3.2.1.2 Turbulence Modeling -- 3.2.1.3 Discretization -- 3.2.1.4 Solution -- 3.2.2 DEM for the Solid-Phase -- 3.2.2.1 Particle Motion and Forces -- 3.2.2.2 DEM Time Step -- 3.2.2.3 DEM Contact Force |
|
3.2.2.4 DEM Particle Drag -- 4 Process Abstraction, Parameterization and Sensitivity -- 4.1 Limitation of Parameter Range -- 4.2 Initial Particle Design and Parameterization -- 4.2.1 Basic Particle Design and Material Properties -- 4.2.2 DEM Contact Model Parameterization -- 4.3 Numerical Investigation of Separation Process in a Downsized Domain -- 4.3.1 Numerical Model -- 4.3.1.1 Model Structure -- 4.3.1.2 Mesh -- 4.3.1.3 Solution Setup -- 4.3.2 Test Procedure -- 4.3.2.1 Particle Injection -- 4.3.2.2 Run -- Particle Separation -- 4.3.3 Preliminary Tests -- 4.3.3.1 Test Program |
|
4.3.3.2 Results and Conclusions -- 4.3.4 Parameter Sensitivity Study -- 4.3.4.1 Test Program -- 4.3.4.2 Results of Sensitivity Study -- 4.4 Experimental Tests of Separation Process in a Downsized Container -- 4.4.1 Structure and Function -- 4.4.2 Measurement Equipment and Data Processing -- 4.4.3 Characterization of Test Material -- 4.4.3.1 Types of mixtures -- 4.4.3.2 Detailed Analysis of Chopped Straw (Lab Mixture) -- 4.4.4 Test Procedure -- 4.4.5 Test Program -- 4.4.6 Experimental Results -- 4.4.6.1 Influence of Fluid Velocity and Material other than Grain -- 4.4.6.2 Influence of Moisture |
| Summary |
This book discusses the application of the coupled CFD-DEM approach for simulating the separation of grain and material other than grain in combine harvester cleaning devices. Based on a literature study, it describes the most important influencing factors and presents a database for particle parameterization. It investigates the separation process in two steps with differing levels of process abstraction. The first step involves numerical separation in a vertically oscillating box with airflow, and in the context of a sensitivity study, investigates the effect of selected material, contact and operating parameters on the target variables' separation time and grain purity. In the second step, the numerical separation process was performed in a 200 mm wide segment of a combine harvester cleaning device. The numerical results were then compared with experimental investigations in order to confirm the method's applicability. The Author Christian Korn studied Mechanical Engineering at the Technical University of Dresden and has been a Research Assistant at the Chair of Agricultural Systems and Technology since 2010 |
| Bibliography |
Includes bibliographical references |
| Notes |
4.4.7 Comparison of Numerical and Experimental Results |
|
Print version record |
| Subject |
Combines (Agricultural machinery) -- Cleaning -- Simulation methods
|
| Form |
Electronic book
|
| ISBN |
9783662616383 |
|
3662616386 |
|
