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Showing 1 - 5 of 5 matches in All Departments
Discusses the modeling and analysis of nanoparticles. Covers all fundamental aspects of particle and droplet flows. Includes heat and mass transfer processes. Features new and updated sections throughout the text. Includes chapter exercises.
The priority research, Analysis, Modelling and Numerical Calculations ofMul tiphase Flows" was running for 6 years (from 1996 to 2002) and financially sup ported by the Deutsche Forschungsgemeinschaft (DFG). The main objective ofthe research programme was to provide a better understanding of the physical basis for multiphase gas-liquid flows as they are found in numerous chemical and bio chemical reactors. The research comprised steady and unsteady multiphase flows in three frequently found reactor configurations, namely bubble columns without interiors, loop reactors, and aerated stirred vessels. For this purpose, new and im proved measurement techniques should be developed. From the resulting knowl edge and data, new and refined models for describing the underlying physical processes should result, which can be used for the establishment and improvement of analytic as well as numerical methods for predicting multiphase reactors. Thereby, the development, lay-out and scale-up ofsuch processes should be pos sible on a more reliable basis. For achieving this objective three research areas were defined: development and improvement of experimental techniques which allow accu rate measurements in steady and unsteady multiphase flows elaboration of new modelling approaches in order to describe the basic trans port processes for mass, momentum, and heat in bubbly flows development of analytical and numerical methods supplemented by the new modelling strategies in order to support optimisation and lay-out of technical multiphase processes."
The priority research, Analysis, Modelling and Numerical Calculations ofMul tiphase Flows" was running for 6 years (from 1996 to 2002) and financially sup ported by the Deutsche Forschungsgemeinschaft (DFG). The main objective ofthe research programme was to provide a better understanding of the physical basis for multiphase gas-liquid flows as they are found in numerous chemical and bio chemical reactors. The research comprised steady and unsteady multiphase flows in three frequently found reactor configurations, namely bubble columns without interiors, loop reactors, and aerated stirred vessels. For this purpose, new and im proved measurement techniques should be developed. From the resulting knowl edge and data, new and refined models for describing the underlying physical processes should result, which can be used for the establishment and improvement of analytic as well as numerical methods for predicting multiphase reactors. Thereby, the development, lay-out and scale-up ofsuch processes should be pos sible on a more reliable basis. For achieving this objective three research areas were defined: development and improvement of experimental techniques which allow accu rate measurements in steady and unsteady multiphase flows elaboration of new modelling approaches in order to describe the basic trans port processes for mass, momentum, and heat in bubbly flows development of analytical and numerical methods supplemented by the new modelling strategies in order to support optimisation and lay-out of technical multiphase processes."
Innerhalb des vorliegenden Forschungsvorhabens soll der EinfluB von Staub- teilchen, welche in der Stromung mitgefUhrt werden, auf die Grenzschicht hinter einer StoBwelle und somit auf die StoBwellenausbreitung in einem Gas-Teilchen-Gemisch geklart werden. Der StoB wird durch Storungen, die von der Grenzschicht hervorgerufen werden, gedampft 11,2,31. Allerdings ist in Gas-Teilchen-Gemischen der StoBdampfung durch die Grenz- schicht ein noch weit groBerer Dampfungseffekt Uberlagert. Dieser wird durch Kompressions- bzw. Explosionswellen, die bei der Beschleunigung der Teilchen entstehen und die StoBstarke beeinflussen, hervorgerufen. Die innerhalb dieses Forschungsvorhabens gewonnenen Erkenntnisse lassen sich auf weite Bereiche in Industrie und Praxis Ubertragen, wo Stromungen mit Teilchen auftreten. Dies ist in der chemischen Industrie, bei pneuma- tischem Transport von Stauben und im Bergbau der Fall. Hier entstehende Staubexplosionen sind in der Regel mit dem Auftreten einer StoBwelle ver- bunden 141, die der Verbrennungsfront voreilt. Die hinter der StoBfront auftretenden DrUcke liegen urn ein Vielfaches Uber denen, die in reinen Gasen auftreten. Die innerhalb der Verbrennungsfront reagierenden Staube sind die Ursache fUr einen weiteren Druckanstieg durch die standige Energiezufuhr. Durch experimentelle Untersuchungen in einem vertikalen StoBrohr ist zu- nachst die sich mit der Lauflange des StoBes andernde StoBstarke gemessen worden. Anhand zahlreicher Versuche ist der EinfluB der verschiedenen Pa- rameter, wie Anfangsmachzahl, Ladungszahl, Teilchendichte und -groBe auf die StoBdampfung ermittelt worden. Zur Abschatzung des Anteils der StoB- verzogerung durch die Grenzschicht, im Vergleich zu reiner Luft, wurden optische MeBmethoden herangezogen, urn die Grenzschichtdicke hinter der StoBwelle messen zu konnen.
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