Grundlagen der Kapitalmarkttheorie und des Portfoliomanagements

Specht, Katja; Gohout, Wolfgang

doi:10.1524/9783486592429

Cited by 1 publication

(2 citation statements)

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“…Whereas analytical data is used frequently, e.g. in physics calculations of the atmosphere, there are only two substances of technical relevance that are widely investigated and readily accessible for reactor modeling: CO 2 and H 2 O. , …”

Section: Methodsmentioning

confidence: 99%

“…On the contrary, model selection is not emphasized sufficiently: Yu et al see radiation as the dominant mode of heat transfer in the compartments between tube loads and furnace accounting for 95% of overall heat transfer; this value was subsequently quoted in further contributions in the field. , Baukal describes the inlet region as radiation dominated and the outlet region as convection dominated . The books by Specht and Woods rely on zonal models and mention that burners with tube loads should be custom designed. , Thus, rules of thumb for design and process intensification of high-temperature catalytic gas phase reactors are scarce.…”

Section: Introductionmentioning

confidence: 99%

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Identification of Key Transport Phenomena in High-Temperature Reactors: Flow and Heat Transfer Characteristics

Liesche

Sundmacher

2018

Ind. Eng. Chem. Res.

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High-temperature reactors are employed to produce key intermediates within the chemical value chain such as synthesis gas and hydrogen cyanide. The drawback of those reactors is their high energy consumption. In practice, intensive simulations, know-how based on experience as well as heuristics are used to optimize those reactors. Knowledge of the key transport phenomena that govern the reactor behavior, however, enables a systematic reactor design and optimization. Using a simplified but effective rigorous two-dimensional reactor model modeling assumptions are scrutinized and key flow and heat transfer phenomena are identified using the case study of synthesis of hydrogen cyanide (HCN). Following the model validation, it is shown that buoyant forces are significant near the walls whereas turbulent flow is negligible. In contrast to estimates using dimensionless numbers both conduction accounting for 81.9 % and radiation with 18.1 % are significant in providing the energy to the reacting gas mixture 1 inside the synthesis compartments. The results demonstrate the importance of a careful model selection for high-temperature reactors and enable a targeted reactor design optimization.

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Section: Methodsmentioning

confidence: 99%