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Domingo J.,ANALISIS DSC | Barbero R.,ANALISIS DSC | Iranzo A.,University of Seville | Cuadra D.,ANALISIS DSC | And 2 more authors.
Tunnelling and Underground Space Technology | Year: 2011

The work and conclusions gained from the analysis of five new underground interchange buildings ongoing in Madrid, Spain, is presented. An additional study was performed for a typical two-level interchange building, and the methodology and results are presented in this paper.First, different ventilation and air conditioning strategies have been analyzed. The main goal is to find the most efficient design in order to maintain pollutants concentration and temperatures below the designed values, at minimum investment and operation costs. Different strategies have been modelled and compared using a Computational Fluid Dynamics (CFD) code, taking into account the buses circulation and the different pollution and heat sources. The final solution developed is based on a physical separation between the island area and the dock area. Conclusions on the efficiency of the different design strategies and possible pitfalls are presented.Secondly, different fire scenarios are analyzed. The main goal is to check whether the fire fighting measures planned, such as mechanical ventilation and a curtains system to define smoke sectors are able to cope with a fire emergency situation. A model for the bus fire has been developed, including heat release and smoke production. The main results presented are temperature fields, visibility and smoke concentration. © 2010 Elsevier Ltd.


Iranzo A.,University of Seville | Barbero R.,ANALISIS DSC | Domingo J.,ANALISIS DSC | Cuadra D.,ANALISIS DSC | And 4 more authors.
Chemical Engineering and Technology | Year: 2011

The turbulent gas-liquid flow field in an industrial 100-m 3 stirred tank was calculated by using computational fluid dynamics based on the finite-volume method. Turbulent effects were modeled with the shear stress transport model, and gas-liquid bubbly flow was modeled with the Eulerian-Eulerian approach using the Grace correlation for the drag force interphase momentum transfer. The relative motion between the rotating impeller and the stationary baffled tank was considered by using a multiple frames of reference algorithm. The effects of Rushton and pitched-blade impeller design parameters such as blade geometry, location, and pumping direction on the mixing performance were investigated. It was found that a combination of Rushton turbines with up-pumping pitched-blade turbines provides the best mixing performance in terms of gas holdup and interfacial area density. The approach outlined in this work is useful for performance optimization of biotechnology reactors, as typically found in fermentation processes. A computational fluid dynamics analysis of the turbulent gas-liquid flow in an industrial stirred tank was performed. The effects of Rushton and pitched-blade impeller design parameters such as blade geometry, location, and pumping direction on the mixing performance were investigated. It was found that a combination of Rushton turbines with up-pumping pitched-blade turbines provides the best mixing performance in terms of gas holdup and interfacial area density. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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