Contents 1. Overview 2. Melting and Fining
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1 1. Overview... 1 Horst Loch 1.1 Introduction Systematics and Boundary Conditions of This Book Some Important 3D Continuum Equations... 6 References Melting and Fining Modeling of the Melting Process in Industrial Glass Furnaces Ruud G.C. Beerkens Application of Process Simulation Models for Glass Furnaces Modeling of Heat Transfer and Convection Flows in Glass-Melting Tanks Sand-Grain Dissolution, Behavior of Gas Bubbles in Glass Melts, and Glass-Quality Index Models for Evaporation and Superstructure Refractory Attack by Vapors Dynamic Modeling Concluding Remarks Mathematical Modeling of Batch Melting in Glass Tanks Wolf S. Kuhn Motivation and Requirements on Batch Modeling Survey of Batch Melting Theoretical Basis of Batch Modeling Key Values and Non-Dimensional Numbers Batch Models High-Frequency Melting of Glass in Crucibles Frank-Thomas Lentes Basics of Electrodynamics Mathematical Formulation of the Simulation Model Simulation Results Conclusion and Outlook
2 VIII Contents 2.4 Model-Based Glass Melter Control Ton Backx Model Concepts Model-Predictive Control Extensions of the MPC Technology Application of MPC in the Glass Industry References Homogenizing and Conditioning The Intensity of Mixing Processes Henry Eisermann, Ulrich Lange, Horst Loch, Günter Weidmann Description and Quantification of Mixing Processes Flows and Particle Paths in Stirrers Statistics of Residence Time and Dispersion Deformation of Infinitesimal Test Bodies Along Particle Paths Deformation Statistics Example: a Simple Paddle Stirrer Outlook Instabilities and Stabilization of Glass Pipe Flows Ulrich Lange, Horst Loch Stationary Temperature and Pressure Profiles inthepipe A Stability Phenomenon Appendix: Derivation of Several Equations Shape Optimization of Flanges Norbert Siedow, Horst Loch, Sandro Manservisi General Shape Optimization: Continuously Varying Thicknesses and Contours Finite-Dimensional Shape Optimization: the 3-Ring/Spoke Flange References Shaping at Low Viscosities Heat Transfer Between Glass and Mold During Hot Forming Matthias Brinkmann, Norbert Siedow Heat Transfer Coefficient Between Glass and Mold Physics and Mathematics of the Heat Transfer Sample Computations Radiative Contributions to the Heat Transfer Laboratory Experiments Remote Spectral Temperature Profile Sensing Matthias Brinkmann, Norbert Siedow, Thomas Korb Thermal Radiation in Hot Glass
3 IX The Inverse Problem of Spectral Temperature Sensing Sample Computations Laboratory Experiment Spectral Imaging of Hot Glass Heat Transfer During Casting Experiments Matthias Brinkmann, Thomas Korb Experimental Set-Up Comparison Between Exact Modeling and Measurement Alternative Modeling Using the Active Thermal Conductivity Thin-Layer Flows of Glass Ulrich Lange Example of a Thin-Layer Model Simplified Energy Balance Validation of the Model Fiber- and Tube-Drawing Models More Comprehensive Thin-Layer Flow Models Pressing of Drinking-Glass Stems Günter Weidmann, Kurt Holtberg, Henry Eisermann Model 1: Finite-Element Modeling Model 2: Analytical Modeling Comparison of Model 1 and Model The Use of Remeshing Methods in Pressing Simulations Ulrich Lange Some Technical Aspects of the Method Example: Pressing of a Tumbler Example: Pressing of an Axisymmetric TV Screen Chill Ripples in Pressing and Casting Processes Ulrich Lange A Simple Casting Process A Model for Kluge s Experimental Set-Up References Reshaping at High Viscosities Temperature-Dependent Elasticity in Reshaping Simulations Thoralf Johansson, Ulrich Fotheringham Model Simulation Results Sagging and Pressing of Glass Sheets Thoralf Johansson Model and Boundary Conditions Results of the Model Computations
4 X Contents 5.3 Calibration of Glass Tubes Thoralf Johansson Model Description Results of the Model Computations Thermal Treatment Verification of Relaxation Models Peter Thomas, Clemens Kunisch Mathematical Models Experiments in the Lehr Simulation Measuring Stress and Compaction Results Stresses and Crack Growth in Continuously Formed Slabs Clemens Kunisch Cooling a Continuous Strip Crack Growth Modified Temperature Program in Order to Avoid Cracking Cutting the Strip into Slabs Thermal Tempering of Drinking Glasses Volker Seibert, Andreas Bensberg Principles of Thermal Tempering Results for Spatially Inhomogeneous Quenching Realization of a Quenching Process Post-Processing by Laser Cutting Kurt Nattermann, Christoph Hermanns 7.1 Rough Estimation of Process Parameters Stress Levels Laser-Beam Profiling Selection of Laser Numerical Analysis of Cutting Processes Calculation of Temperature Distributions Calculation of Stress Distributions Condition for Cut Elongation Calculation of Stress Intensities for Laser Cutting Practical Realization Appendix: Fundamentals of Fracture Mechanics Fracture Mechanics for Brittle Solids FEA Calculation of Stress-Intensity Factors Prediction of the Crack Path
5 XI 8. Glass Products Under Mechanical and Thermal Loads Strength Optimization of Airbag Igniters Kurt Nattermann, Harald Krümmel, Ludwig Frank FEA for Axial-Symmetric Models FEA of 3D Models Pull-Out Tests Push-Out Tests Pressure Tests Appendix: Statistical Procedure Stiffness and Weight Optimization of a Reticle Stage for Optical Lithography Volker Seibert Requirements for a (9 9) Reticle Stage Design of a Prototype FEM Optimization Without Additional Masses FEM Analysis With Additional Masses References Simulation and Test of the Spinning Process Applied to Platinum Metals Seth Nzahumunyurwa, Hans-Jürgen Hoffmann, Hans Oechsner, Joachim Disam 9.1 Necessity to Shape Materials Qualitative Description of the Spinning Process Essential Assumptions for the Modeling of the Spinning Process General Relations for the Model of the Spinning Process Approximations First Approximation: Quasi-Homogeneous Deformation Second Approximation: Linearly Decreasing Deformation A Practical Example for the First and Second Approximations Experimental Observations and Discussion References List of Contributors Sources of Figures and Tables Index
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