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Comparison of three different CFD methods for dense fluidized beds and validation by a cold flow experiment

Particuology 2016年第6期14卷 34-47页

作者： alexander stroh Falah Alobaid Max Thomas Hasenzahl] Jochen Hilz Jochen strohle Bernd Epple Technische Universitdt Darmstadt Institute for Energy Systems and Technology Otto-Berndt-Straβe 2 64287 Darmstadt Germany

This work focuses on a comparison between three different numerical CFD methods, namely Euler-Euler, Euler-Lagrange-stochastic, and Euler-Lagrange-deterministic, to treat a dense spouted bed, A simple cold flow experiment was used to investigate the hydrodynamics of a gas-solid flow in a three dimensional lab-scale spouted bed, In this context, two different air mass flow rates, 0,005 and 0.006 kg/s, were applied during fluidization. The experimental bed behaviour was recorded with a high-speed camera to validate the numerical predictions in terms of bubble size, bed expansion rate, and particle velocities at different reactor heights. The numerical setup was kept similar between all three modelling approaches, At both gas mass flow rates all three approaches are able to capture the overall bed expansion. However, at higher gas mass flow rates, discrepancies between experiment and simulation increase for the Euler-Euler and Euler-Lagrange-stochastic models. The Euler-Lagrange deterministic model most accurately predicts the flow pattern at both mass flow rates. The main reasons for discrepancies between simulation and experiment result from modelling of the collision and friction forces.

关键词： Computational fluid dynamics Euler-Lagrange-deterministic collisionmodel Euler-EulerMP-PIC approach Experimental validation

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Cerebral processing of auditory stimuli in patients with irritable bowel syndrome

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World Journal of Gastroenterology 2006年第11期12卷 1723-1729页

作者： Viola Andresen alexander Poellinger Chedwa Tsrouya Dominik Bach Albrecht stroh Annette Foerschler Petra Georgiewa Marco Schmidtmann Ivo R van der Voort Peter Kobelt Claus Zimmer Bertram Wiedenmann Burghard F Klapp Hubert Monnikes Department of Medicine Division of Psychosomatic Medicine and Psychotherapy Charité-Universi-t(a|¨)tsmedizin BerlinBerlinGermany Department of Radiology Charité-Universit(a|¨)tsmedizin Berlin BerlinGermany Department of Medicine Division of Hepatology Gastroenterologyand Endocrinology Department of Neuroradiology University of Leipzig LeipzigGermany Department of Medicine Division of Psychosomatic Medicine and Psychotherapy Charité-Universit(a|¨)tsmedizin BerlinBerlinGermany Department of Neuroradiology Klinikum rechts der Isar Technische Universit(a|¨)t MünchenMunichGermany

瞄准：用大脑决定功能的磁性的回声成像(fMRI ) 非内脏的刺激的服的处理是否在急躁的肠症候群(IBS ) 被改变病人与健康题目相比。围绕针的内脏躯体集中机制，并且识别心理因素的可能的影响，我们使用了听觉的刺激刺激在他们的感情的质... 详细信息

瞄准：用大脑决定功能的磁性的回声成像(fMRI ) 非内脏的刺激的服的处理是否在急躁的肠症候群(IBS ) 被改变病人与健康题目相比。围绕针的内脏躯体集中机制，并且识别心理因素的可能的影响，我们使用了听觉的刺激刺激在他们的感情的质量不同。方法：在 8 个 IBS 病人和 8 控制， fMRI 大小用不同感情的质量(钟声，讨厌的偷看(2000 Hz ) ，中立的词，和感情的词的愉快的声音) 的 4 听觉的刺激的一个块图案被执行。坡度回响 T2 * 加权的顺序被用于功能的扫描。统计地图用一般线性模型被构造。结果：到感情的听觉的刺激，，相对控制的 IBS 病人在感情的处理区域的一个更大的变化与更强壮的释放反应了反应模式，在控制不同，没在令人烦恼或愉快的声音之间区分。到中立听觉的刺激，由对比，仅仅 IBS 病人与大重要激活反应了。结论：到在感情的处理刺激的区域的听觉的刺激的改变的服的反应模式建议在 IBS 的改变的感觉处理不能为内脏的感觉是特定的，但是可能在感情的敏感和感情方面的反应反映概括变化，可能与经常在 IBS 病人发现的心理 comorbidity 联系了。

关键词：听觉刺激肠炎病理机制治疗

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Results of Sleeve Gastrectomy in Germany—Data on Nationwide Survey on Quality Assurance in Bariatric Surgery in Germany

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Surgical Science 2012年第4期3卷 169-176页

作者： Christine stroh Rudolf Weiner Thomas Horbach Kaja Ludwig Miriam Dressler Stefanie Wolff Hans Lippert Martin Büsing Uwe Schmidt Thomas Manger Department of General Abdominal and Pediatric Surgery Municipal Hospital Gera Germany Department of General Abdominal and Vascular Surgery University Hospital Magdeburg Magdeburg Germany Friedrich alexander University Erlangen-Nürnberg Erlangen Germany Hospital Knappschaft Recklinghausen Recklinghausen Germany Hospital Rostock Südstadt Rostock Germany Hospital Sachsenhausen Frankfurt am Main Frankfurt Main Germany Muncipial Hospitals Dresden Neustadt Dresden Germany StatConsult Magdeburg Magdeburg Germany

Background: Since January 1st of 2005, the situation of bariatric surgery is being analyzed in Germany. The data is registered prospectively in cooperation with the Institute of Quality Assurance in Surgery at the Otto-von-Guericke University Magdeburg. Methods: The data is registered through an online database which includes all information for primary and revision bariatric procedures as well as yearly follow-up. Participation in the quality assurance study is optional. All certificated centers have to participate at the survey. Results: From January 2006 to December 2009, 1478 sleeve gastrectomies (SG) were performed at 45 hospitals. The number of procedures has increased from 126 in 2007 to 933 in 2009. The main complication is leakage of the staple-line. Initial leakage rate was 7% in 2007. Leakage rate dropped down to 2.3% in 2008 and 2.5% in 2009. Mean age of patients was 43.1 years and mean BMI was 52.83 kg/m2. Age and BMI were significantly higher in patients with SG than in all other patients undergoing bariatric surgery. Conclusion: SG is a common and hype bariatric procedure in Germany, but postoperative complication rate is high. Data on the long-term effect of SG on weight loss and amelioration of comorbidities need to be evaluated. More detailed analyzes are necessary to establish the position of SG in the bariatric surgery. Further studies should also include examinations on long-term complications and redo-procedure after SG.

关键词： Bariatric Surgery Sleeve Gastrectomy German Multicenter Trial Leakage Complications

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