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1. |
Record Nr. |
UNINA9910346915603321 |
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Autore |
Quarch Kerstin |
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Titolo |
Produktgestaltung an kolloidalen Agglomeraten und Gelen : Gelierung und Fragmentierung anorganisch gefällten Siliciumdioxids |
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Pubbl/distr/stampa |
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KIT Scientific Publishing, 2010 |
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ISBN |
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Descrizione fisica |
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1 online resource (VIII, 204 p. p.) |
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Soggetti |
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Technology: general issues |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Sommario/riassunto |
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Amorphes Siliciumdioxid findet als Füllstoff verbreitet Anwendung. Es wird u.a. durch die Vermischung einer Silikatlösung mit einer Säure hergestellt. Dabei entsteht intermediär ein Gel. Mit dieser Arbeit wird ein Beitrag zur Steuerung der Eigenschaften des Produktpulvers geleistet. Es wird eine Formel vorgestellt, mit der die Gelierzeit aus den Konzentrationen der Einsatzstoffe abgeschätzt werden kann. Für die Fragmentierung des Gels werden Parallelen zum Aufbruch hochviskoser Tropfen gezeigt. |
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2. |
Record Nr. |
UNINA9910299951603321 |
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Autore |
Alobaid Falah |
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Titolo |
Numerical Simulation for Next Generation Thermal Power Plants / / by Falah Alobaid |
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Pubbl/distr/stampa |
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Cham : , : Springer International Publishing : , : Imprint : Springer, , 2018 |
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ISBN |
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Edizione |
[1st ed. 2018.] |
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Descrizione fisica |
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1 online resource (xxvi, 431 pages) |
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Collana |
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Springer Tracts in Mechanical Engineering, , 2195-9862 |
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Disciplina |
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Soggetti |
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Vibration |
Dynamics |
Energy systems |
Fluid mechanics |
Physics |
Vibration, Dynamical Systems, Control |
Energy Systems |
Engineering Fluid Dynamics |
Numerical and Computational Physics, Simulation |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Nota di contenuto |
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Introduction -- Process Simulation -- Computational Fluid Dynamics -- Results -- Conclusion. |
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Sommario/riassunto |
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The book provides highly specialized researchers and practitioners with a major contribution to mathematical models’ developments for energy systems. First, dynamic process simulation models based on mixture flow and two-fluid models are developed for combined-cycle power plants, pulverised coal-fired power plants, concentrated solar power plant and municipal waste incineration. Operation data, obtained from different power stations, are used to investigate the capability of dynamic models to predict the behaviour of real processes and to analyse the influence of modeling assumptions on simulation results. Then, a computational fluid dynamics (CFD) simulation programme, so-called DEMEST, is developed. Here, the fluid-solid, particle-particle and particle-wall interactions are modeled by tracking all individual |
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particles. To this purpose, the deterministic Euler-Lagrange/Discrete Element Method (DEM) is applied and further improved. An emphasis is given to the determination of inter-phase values, such as volumetric void fraction, momentum and heat transfers, using a new procedure known as the offset-method and to the particle-grid method allowing the refinement of the grid resolution independently from particle size. Model validation is described in detail. Moreover, thermochemical reaction models for solid fuel combustion are developed based on quasi-single-phase, two-fluid and Euler-Lagrange/MP-PIC models. Measurements obtained from actual power plants are used for validation and comparison of the developed numerical models. |
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