The Experts below are selected from a list of 26631 Experts worldwide ranked by ideXlab platform
Qiaoyan Ye - One of the best experts on this subject based on the ideXlab platform.
-
the simulation of electrostatic spray Painting Process with high speed rotary bell atomizers part ii external charging
Particle & Particle Systems Characterization, 2006Co-Authors: Joachim Domnick, Andreas Scheibe, Qiaoyan YeAbstract:The present contribution summarizes investigations aiming to completely model the electrostatically supported spray Painting Process with high-speed rotary bells by means of CFD. In this part II, so-called external charging atomizers, where high voltage is applied to emitting electrode needles, are considered. Here, charging of the droplets takes place due to free ions produced from corona discharge at the electrodes. Part I [1] dealt with direct charging atomizers, where potential is applied directly to the rotating bell. The commercial CFD-code Fluent has been extended to account for the electrostatic field and the space charge effect due to the ions. Here, a model for the time-dependent and inhomogeneous field charging of the droplets was applied. Furthermore, the direct interaction between the ion current and the flow field, i.e., the so-called ion wind, could be calculated. As input conditions, the airflow from the shaping air orifices and measured droplet sizes close to the bell edge using Fraunhofer diffraction were taken. In general, numerical and experimental results are in good agreement, confirming the applicability of the chosen physical approach. This is especially true for the final film thickness on the target and the transfer efficiency, i.e., the amount of paint solids that finally deposited on the target. In the near future the calculations must be extended to true unsteady simulations including the dynamic meshing procedure.
-
the simulation of the electrostatic spray Painting Process with high speed rotary bell atomizers part i direct charging
Particle & Particle Systems Characterization, 2005Co-Authors: Joachim Domnick, Andreas Scheibe, Qiaoyan YeAbstract:High-speed rotary bell atomizers are widely used in the Painting industry for high quality applications. They provide a highly uniform film thickness with reasonable transfer efficiency due to the additional electrostatic field supporting the droplet transport towards the target. A basic requirement for this type of paint atomizer is a fine and reproducible atomization of a large variety of different paints, ranging from solvent-based materials to highly non-Newtonian water-borne systems. Furthermore, a broad range of paint flow rates must be covered. The present contribution summarizes investigations aiming to completely model the electrostatically supported spray Painting Process by means of CFD. In part I, so-called direct charging atomizers, where high voltage is applied directly to the rotating bell, are considered. Here, charging of the droplets takes place at the bell edge and corona effects can be neglected. A powerful commercial code, in the present case Fluent in its current releases, has been extended to account for the electrostatic field and the space charge effect due to the charged paint droplets. As input conditions, the air flow from the shaping air orifices and measured droplet sizes and velocities close to the bell edge using phase-Doppler anemometry and Fraunhofer diffraction were taken. Also, LDA measurements in front of the target were performed, yielding comparative data of the airflow field. In general, numerical and experimental results are in good agreement. This is especially true for the final film thickness on the target and the transfer efficiency, i.e. the amount of paint solids finally deposited on the target. The agreement was achieved using a droplet charge of 5% of the droplet size dependent Rayleigh limit. These results serve as a basis for a complete Painting Process simulation for complex work pieces, e.g. whole car bodies, in the future. This task, however, can only be successfully completed performing unsteady calculations with moving atomizers along given robot paths.
Joachim Domnick - One of the best experts on this subject based on the ideXlab platform.
-
the simulation of electrostatic spray Painting Process with high speed rotary bell atomizers part ii external charging
Particle & Particle Systems Characterization, 2006Co-Authors: Joachim Domnick, Andreas Scheibe, Qiaoyan YeAbstract:The present contribution summarizes investigations aiming to completely model the electrostatically supported spray Painting Process with high-speed rotary bells by means of CFD. In this part II, so-called external charging atomizers, where high voltage is applied to emitting electrode needles, are considered. Here, charging of the droplets takes place due to free ions produced from corona discharge at the electrodes. Part I [1] dealt with direct charging atomizers, where potential is applied directly to the rotating bell. The commercial CFD-code Fluent has been extended to account for the electrostatic field and the space charge effect due to the ions. Here, a model for the time-dependent and inhomogeneous field charging of the droplets was applied. Furthermore, the direct interaction between the ion current and the flow field, i.e., the so-called ion wind, could be calculated. As input conditions, the airflow from the shaping air orifices and measured droplet sizes close to the bell edge using Fraunhofer diffraction were taken. In general, numerical and experimental results are in good agreement, confirming the applicability of the chosen physical approach. This is especially true for the final film thickness on the target and the transfer efficiency, i.e., the amount of paint solids that finally deposited on the target. In the near future the calculations must be extended to true unsteady simulations including the dynamic meshing procedure.
-
The Simulation of Electrostatic Spray Painting Process with High‐Speed Rotary Bell Atomizers. Part II: External Charging
Particle & Particle Systems Characterization, 2006Co-Authors: Joachim Domnick, Andreas ScheibeAbstract:The present contribution summarizes investigations aiming to completely model the electrostatically supported spray Painting Process with high-speed rotary bells by means of CFD. In this part II, so-called external charging atomizers, where high voltage is applied to emitting electrode needles, are considered. Here, charging of the droplets takes place due to free ions produced from corona discharge at the electrodes. Part I [1] dealt with direct charging atomizers, where potential is applied directly to the rotating bell. The commercial CFD-code Fluent has been extended to account for the electrostatic field and the space charge effect due to the ions. Here, a model for the time-dependent and inhomogeneous field charging of the droplets was applied. Furthermore, the direct interaction between the ion current and the flow field, i.e., the so-called ion wind, could be calculated. As input conditions, the airflow from the shaping air orifices and measured droplet sizes close to the bell edge using Fraunhofer diffraction were taken. In general, numerical and experimental results are in good agreement, confirming the applicability of the chosen physical approach. This is especially true for the final film thickness on the target and the transfer efficiency, i.e., the amount of paint solids that finally deposited on the target. In the near future the calculations must be extended to true unsteady simulations including the dynamic meshing procedure.
-
The Simulation of the Electrostatic Spray Painting Process with High‐Speed Rotary Bell Atomizers. Part I: Direct Charging
Particle & Particle Systems Characterization, 2005Co-Authors: Joachim Domnick, Andreas ScheibeAbstract:High-speed rotary bell atomizers are widely used in the Painting industry for high quality applications. They provide a highly uniform film thickness with reasonable transfer efficiency due to the additional electrostatic field supporting the droplet transport towards the target. A basic requirement for this type of paint atomizer is a fine and reproducible atomization of a large variety of different paints, ranging from solvent-based materials to highly non-Newtonian water-borne systems. Furthermore, a broad range of paint flow rates must be covered. The present contribution summarizes investigations aiming to completely model the electrostatically supported spray Painting Process by means of CFD. In part I, so-called direct charging atomizers, where high voltage is applied directly to the rotating bell, are considered. Here, charging of the droplets takes place at the bell edge and corona effects can be neglected. A powerful commercial code, in the present case Fluent in its current releases, has been extended to account for the electrostatic field and the space charge effect due to the charged paint droplets. As input conditions, the air flow from the shaping air orifices and measured droplet sizes and velocities close to the bell edge using phase-Doppler anemometry and Fraunhofer diffraction were taken. Also, LDA measurements in front of the target were performed, yielding comparative data of the airflow field. In general, numerical and experimental results are in good agreement. This is especially true for the final film thickness on the target and the transfer efficiency, i.e. the amount of paint solids finally deposited on the target. The agreement was achieved using a droplet charge of 5% of the droplet size dependent Rayleigh limit. These results serve as a basis for a complete Painting Process simulation for complex work pieces, e.g. whole car bodies, in the future. This task, however, can only be successfully completed performing unsteady calculations with moving atomizers along given robot paths.
-
the simulation of the electrostatic spray Painting Process with high speed rotary bell atomizers part i direct charging
Particle & Particle Systems Characterization, 2005Co-Authors: Joachim Domnick, Andreas Scheibe, Qiaoyan YeAbstract:High-speed rotary bell atomizers are widely used in the Painting industry for high quality applications. They provide a highly uniform film thickness with reasonable transfer efficiency due to the additional electrostatic field supporting the droplet transport towards the target. A basic requirement for this type of paint atomizer is a fine and reproducible atomization of a large variety of different paints, ranging from solvent-based materials to highly non-Newtonian water-borne systems. Furthermore, a broad range of paint flow rates must be covered. The present contribution summarizes investigations aiming to completely model the electrostatically supported spray Painting Process by means of CFD. In part I, so-called direct charging atomizers, where high voltage is applied directly to the rotating bell, are considered. Here, charging of the droplets takes place at the bell edge and corona effects can be neglected. A powerful commercial code, in the present case Fluent in its current releases, has been extended to account for the electrostatic field and the space charge effect due to the charged paint droplets. As input conditions, the air flow from the shaping air orifices and measured droplet sizes and velocities close to the bell edge using phase-Doppler anemometry and Fraunhofer diffraction were taken. Also, LDA measurements in front of the target were performed, yielding comparative data of the airflow field. In general, numerical and experimental results are in good agreement. This is especially true for the final film thickness on the target and the transfer efficiency, i.e. the amount of paint solids finally deposited on the target. The agreement was achieved using a droplet charge of 5% of the droplet size dependent Rayleigh limit. These results serve as a basis for a complete Painting Process simulation for complex work pieces, e.g. whole car bodies, in the future. This task, however, can only be successfully completed performing unsteady calculations with moving atomizers along given robot paths.
Andreas Scheibe - One of the best experts on this subject based on the ideXlab platform.
-
the simulation of electrostatic spray Painting Process with high speed rotary bell atomizers part ii external charging
Particle & Particle Systems Characterization, 2006Co-Authors: Joachim Domnick, Andreas Scheibe, Qiaoyan YeAbstract:The present contribution summarizes investigations aiming to completely model the electrostatically supported spray Painting Process with high-speed rotary bells by means of CFD. In this part II, so-called external charging atomizers, where high voltage is applied to emitting electrode needles, are considered. Here, charging of the droplets takes place due to free ions produced from corona discharge at the electrodes. Part I [1] dealt with direct charging atomizers, where potential is applied directly to the rotating bell. The commercial CFD-code Fluent has been extended to account for the electrostatic field and the space charge effect due to the ions. Here, a model for the time-dependent and inhomogeneous field charging of the droplets was applied. Furthermore, the direct interaction between the ion current and the flow field, i.e., the so-called ion wind, could be calculated. As input conditions, the airflow from the shaping air orifices and measured droplet sizes close to the bell edge using Fraunhofer diffraction were taken. In general, numerical and experimental results are in good agreement, confirming the applicability of the chosen physical approach. This is especially true for the final film thickness on the target and the transfer efficiency, i.e., the amount of paint solids that finally deposited on the target. In the near future the calculations must be extended to true unsteady simulations including the dynamic meshing procedure.
-
The Simulation of Electrostatic Spray Painting Process with High‐Speed Rotary Bell Atomizers. Part II: External Charging
Particle & Particle Systems Characterization, 2006Co-Authors: Joachim Domnick, Andreas ScheibeAbstract:The present contribution summarizes investigations aiming to completely model the electrostatically supported spray Painting Process with high-speed rotary bells by means of CFD. In this part II, so-called external charging atomizers, where high voltage is applied to emitting electrode needles, are considered. Here, charging of the droplets takes place due to free ions produced from corona discharge at the electrodes. Part I [1] dealt with direct charging atomizers, where potential is applied directly to the rotating bell. The commercial CFD-code Fluent has been extended to account for the electrostatic field and the space charge effect due to the ions. Here, a model for the time-dependent and inhomogeneous field charging of the droplets was applied. Furthermore, the direct interaction between the ion current and the flow field, i.e., the so-called ion wind, could be calculated. As input conditions, the airflow from the shaping air orifices and measured droplet sizes close to the bell edge using Fraunhofer diffraction were taken. In general, numerical and experimental results are in good agreement, confirming the applicability of the chosen physical approach. This is especially true for the final film thickness on the target and the transfer efficiency, i.e., the amount of paint solids that finally deposited on the target. In the near future the calculations must be extended to true unsteady simulations including the dynamic meshing procedure.
-
The Simulation of the Electrostatic Spray Painting Process with High‐Speed Rotary Bell Atomizers. Part I: Direct Charging
Particle & Particle Systems Characterization, 2005Co-Authors: Joachim Domnick, Andreas ScheibeAbstract:High-speed rotary bell atomizers are widely used in the Painting industry for high quality applications. They provide a highly uniform film thickness with reasonable transfer efficiency due to the additional electrostatic field supporting the droplet transport towards the target. A basic requirement for this type of paint atomizer is a fine and reproducible atomization of a large variety of different paints, ranging from solvent-based materials to highly non-Newtonian water-borne systems. Furthermore, a broad range of paint flow rates must be covered. The present contribution summarizes investigations aiming to completely model the electrostatically supported spray Painting Process by means of CFD. In part I, so-called direct charging atomizers, where high voltage is applied directly to the rotating bell, are considered. Here, charging of the droplets takes place at the bell edge and corona effects can be neglected. A powerful commercial code, in the present case Fluent in its current releases, has been extended to account for the electrostatic field and the space charge effect due to the charged paint droplets. As input conditions, the air flow from the shaping air orifices and measured droplet sizes and velocities close to the bell edge using phase-Doppler anemometry and Fraunhofer diffraction were taken. Also, LDA measurements in front of the target were performed, yielding comparative data of the airflow field. In general, numerical and experimental results are in good agreement. This is especially true for the final film thickness on the target and the transfer efficiency, i.e. the amount of paint solids finally deposited on the target. The agreement was achieved using a droplet charge of 5% of the droplet size dependent Rayleigh limit. These results serve as a basis for a complete Painting Process simulation for complex work pieces, e.g. whole car bodies, in the future. This task, however, can only be successfully completed performing unsteady calculations with moving atomizers along given robot paths.
-
the simulation of the electrostatic spray Painting Process with high speed rotary bell atomizers part i direct charging
Particle & Particle Systems Characterization, 2005Co-Authors: Joachim Domnick, Andreas Scheibe, Qiaoyan YeAbstract:High-speed rotary bell atomizers are widely used in the Painting industry for high quality applications. They provide a highly uniform film thickness with reasonable transfer efficiency due to the additional electrostatic field supporting the droplet transport towards the target. A basic requirement for this type of paint atomizer is a fine and reproducible atomization of a large variety of different paints, ranging from solvent-based materials to highly non-Newtonian water-borne systems. Furthermore, a broad range of paint flow rates must be covered. The present contribution summarizes investigations aiming to completely model the electrostatically supported spray Painting Process by means of CFD. In part I, so-called direct charging atomizers, where high voltage is applied directly to the rotating bell, are considered. Here, charging of the droplets takes place at the bell edge and corona effects can be neglected. A powerful commercial code, in the present case Fluent in its current releases, has been extended to account for the electrostatic field and the space charge effect due to the charged paint droplets. As input conditions, the air flow from the shaping air orifices and measured droplet sizes and velocities close to the bell edge using phase-Doppler anemometry and Fraunhofer diffraction were taken. Also, LDA measurements in front of the target were performed, yielding comparative data of the airflow field. In general, numerical and experimental results are in good agreement. This is especially true for the final film thickness on the target and the transfer efficiency, i.e. the amount of paint solids finally deposited on the target. The agreement was achieved using a droplet charge of 5% of the droplet size dependent Rayleigh limit. These results serve as a basis for a complete Painting Process simulation for complex work pieces, e.g. whole car bodies, in the future. This task, however, can only be successfully completed performing unsteady calculations with moving atomizers along given robot paths.
Guoxian Xiao - One of the best experts on this subject based on the ideXlab platform.
-
Quality flow model in automotive paint shops
International Journal of Production Research, 2013Co-Authors: Guoxian Xiao, Jorge ArinezAbstract:AbstractImproving paint quality is of significant importance for vehicle manufacturing. In this paper, a quality flow model is presented to analyse and improve quality in automotive paint shops. Specifically, we study the vehicle-Painting Process with multiple inspection stations. After each inspection, vehicles failed to achieve quality requirement will be repaired before moving to the next operation. In such systems, the quality variations may propagate along the Painting Process. To address this, a three-state quality flow model has been developed, and analytical formulas to evaluate product quality have been derived. In addition, to improve quality performance, a bottleneck analysis method has been introduced to identify the most critical stage that impedes product quality in the strongest manner. Two case studies at automotive paint shops are introduced to illustrate the applicability of the method.
-
Production system design to achieve energy savings in an automotive paint shop
International Journal of Production Research, 2011Co-Authors: Claudia Arenas Guerrero, Ningjian Huang, Jorge Arinez, Stephan Biller, Jingshan Li, Junwen Wang, Guoxian XiaoAbstract:Vehicle Painting typically consumes the largest amount of energy in an automotive assembly plant. Effective reduction of energy usage in paint shops will lead to significant savings. Substantial effort has been devoted to reducing energy usage in paint shops through renovating the Painting Process and equipment. In this paper, we introduce a case study at an automotive paint shop to show that the energy consumption can be reduced significantly through production system design. Specifically, by selecting the appropriate repair capacity, the number of repainted jobs can be reduced, and less material and energy will be consumed. In addition, less atmospheric emissions would be generated during the Painting Process. Such a technique does not need to invent new chemicals, new Painting Processes or new control systems in Painting booths and ovens. It provides an alternative way for energy and emission reduction to achieve energy-efficient and environmentally friendly manufacturing.
Won Ho Jo - One of the best experts on this subject based on the ideXlab platform.
-
annealing free high efficiency and large area polymer solar cells fabricated by a roller Painting Process
Advanced Functional Materials, 2010Co-Authors: Jae Woong Jung, Won Ho JoAbstract:Polymer solar cells are fabricated by a novel solution coating Process, roller Painting. The roller-painted film ― composed of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) ― has a smoother surface than a spin-coated film. Since the roller Painting is accompanied by shear and normal stresses and is also a slow drying Process, the Process effectively induces crystallization of P3HT and PCBM. Both crystalline P3HT and PCBM in the roller-painted active layer contribute to enhanced and balanced charge-carrier mobility. Consequently, the roller-Painting Process results in a higher power conversion efficiency (PCE) of 4.6%, as compared to that for spin coating (3.9%). Furthermore, annealing-free polymer solar cells (PSCs) with high PCE are fabricated by the roller Painting Process with the addition of a small amount of octanedi-1,8-thiol. Since the addition of octanedi-1,8-thiol induces phase separation between P3HT and PCBM and the roller-Painting Process induces crystallization of P3HT and PCBM, a PCE of roller-painted PSCs of up to 3.8% is achieved without post-annealing. A PCE of over 2.7% can also be achieved with 5 cm 2 of active area without post-annealing.
