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- Kobayashi, T., et al.
(författare)
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Stream tube analysis of cross-ventilated simple-shaped model and detached house
- 2007
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Ingår i: IAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings. - 9784861630705 ; , s. 139-146
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Konferensbidrag (refereegranskat)abstract
- Conventional method to predict ventilation rate induced by wind is based on the orifice equation associated with the discharge coefficient and wind pressure coefficient. In the cross-ventilation phenomena, however, this method has a problem due to the difficulty to predict resistance of the building related with total pressure loss. In this paper, therefore, the stream tube caught by the inlet opening is analyzed to investigate the pressure loss due to the transformation (and possibly convergence and divergence) of the stream tube. Two types of model, simple-shaped rectangular model and detached house model, were analyzed with three cases of porosity by using CFD prediction. Flow fields inside and outside of the model are to be compared between two types of model. Besides, based on the stream tube analysis, cross-sectional area and average pressure inside the stream tube will be shown and compared between two types of model. For the detached house model, finally, static pressure inside the stream tube will be compared with that on the floor.
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- Duda, L.-C., et al.
(författare)
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Resonant inelastic X-ray scattering at the NiO O K-resonance: non-local charge-transfer and double singlet excitations
- 2007
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Ingår i: MAX-lab. - Lund : MAX-lab. ; , s. 270-271
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- NiO is one of the prototypical compounds that has highlighted the importance of correlation effects in transition metal oxides. Core level spectroscopies bear evidence for the highly correlated nature of low energy excitations. For instance, the asymmetry of the Ni2p-line shape has been attributed to non-local charge transfer excitations and multi-site cluster calculations show that solidstate effects generally are appreciable for correlated materials, such as cuprates and high Tc-compounds.....
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- Duda, Laurent, et al.
(författare)
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Resonant Inelastic X-Ray Scattering at the Oxygen K Resonance of NiO: Nonlocal Charge Transfer and Double-Singlet Excitations
- 2006
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Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 96:067402
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Tidskriftsartikel (refereegranskat)abstract
- We report high-resolution polarization-dependent resonant inelastic x-ray scattering (RIXS) at the O K resonance of NiO showing a rich excitation spectrum. We perform multisite Ni6O19 cluster model calculations, revealing that solid state effects are substantial. We identify a nonlocal charge transfer excitation at 4–5 eV and double-singlet creation at 1.75 eV, both exhibiting significant scattering geometry dependence. Apart from an intense band of local charge transfer excitations (above 5 eV) also dd excitations at 1 eV are observed. Finally, we point out that O K RIXS of correlated metal oxides allows a quantitative and consistent determination of the charge transfer energy and the Hund coupling energy JH.
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- Kobayashi, Tomohiro, et al.
(författare)
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Wind driven flow through openings : Analysis of the stream tube
- 2006
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Ingår i: The International Journal of Ventilation. - : Informa UK Limited. - 1473-3315 .- 2044-4044. ; 4:4, s. 323-336
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Tidskriftsartikel (refereegranskat)abstract
- Wind approaching a building provided with openings on the windward and leeward sides has a choice, either it flows through the openings or flows around and above the building. This choice gives rise to a dominant stream tube containing the fluid flowing through the openings. In this paper the stream tube is analysed based on wind tunnel measurements and CFD simulation. A house model with dimensions 120 mm (Width)× 120 mm (Height)× 180 mm (Length) was provided with rectangular openings of equal size located opposite each other. The end walls were thin giving rise to a sharp edged opening. The size of the openings expressed as the porosity (opening area divided by the façade area) was 1.3 %, 5.2 %, 11.6 %, 20.7 % and 46.5 %. In the wind tunnel, velocity including velocity fluctuations and pressure were measured along the centre line through the openings. In the CFD prediction it was possible to visualize the stream tube by the method of "flying particles". This made it possible to explore the change in shape of the stream tube and to calculate the cross-sections of the stream tube at different positions and to know the total pressure distribution within the stream tube cross section. Finally, the discharge coefficient based on stream tube analysis was compared to that from a conventional chamber method.
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