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Ventilation
Published in Roger Greeno, Building Services, Technology and Design, 2014
Splitters and dampers are used in ductwork to provide air direction and regulation. Splitters are blades or vanes fixed in the airstream to direct medium to high-velocity air around bends and offsets. They control flow conditions to reduce turbulence and associated noise. Dampers are rotating blades used to
A review of road models for vehicular control
Published in Vehicle System Dynamics, 2023
Figure 9 shows the car's speed, its offset from the centre line and the height of the front splitter that is used to inform the aerodynamics model. The speed predictions associated with the track models given in Sections 5 and 7 are within 2 m/s throughout a racing lap. For the most part these predictions lie between the measured data and the high-fidelity industrial simulation. In the case that , the predictions made by the models in Sections 5 and 7 are comparable and less ‘spread out’ than in the case. In the case the lateral offset predictions made by the models in Sections 5 and 7 are almost identical, but incorrect because they ignore that lateral camber variations of the track. In the case, the predictions are again almost identical for the first 1400 m, with a peak difference of approximately 4 m appearing at 1600 m. At 1600 m the measured and industrial simulation results lie between the two. In this case the Section 5 model appears more accurate. The splitter height predictions made by the two models were in close agreement with each other, and with the prediction made by the industrial simulator.
Aerodynamic Instability of Circular Slender Structures Due to Bistable Flow Activity
Published in Structural Engineering International, 2022
Adel Benidir, Olivier Flamand, Grigorios Dimitriadis, Philippe Delpech
Inclined long cables in cable-stayed bridges can experience large displacements when the cable covers are subjected to wind load under dry conditions. This phenomenon is called dry galloping (DG). This event has been observed at a specific flow regime1,2 and the assumed excitation is exclusively linked to the aerodynamic behavior of the cable.3 Various theories have been advanced to explain the triggering mechanism behind cable vibrations with high amplitudes. Ref. [4] described the mechanism of dry galloping as similar to the one causing vibration when a splitter plate is placed in the wake of a circular cylinder. A second interpretation of the origin of dry galloping is derived from Den Hartog galloping. The slightly elliptical cross-sectional shape of cable protection covers is considered likely to create a negative lift slope.5 Accordingly, analytical models and unified approaches were developed to prevent dry inclined cable galloping.6,7. Thirdly, transition in the critical flow regime has been recently theorized to be the most important parameter causing high cable responses.3,8 The term transition here is referring to the passage from laminar to turbulent. Previous studies of many scholars discussed the emergence of the critical Reynolds number regime as another possible contributing factor to dry cable galloping.6,9 Ref. [10] supports this last theory by concluding that the contribution of the transition within the critical flow regime is one of the principal parameters governing dry galloping.
Enhanced thermal and fluid flow performance of cross flow tube bank with perforated splitter plate
Published in Experimental Heat Transfer, 2021
Ankit Choudhary, Manoj Kumar, Anil Kumar Patil, Sunil Chamoli
The friction factor for cylindrical tubes with a simple splitter plate is plotted for different values of (Rw) ratio in Figure 5. It is observed that the friction factor decreases as the Reynolds number approach to higher values for the bare cylinder, however, the variation of friction factor is comparatively small for the tubes with solid splitter plate. The maximum friction factor corresponds to the bare cylinder followed by the case of tubes with a simple splitter plate having (Rw) of 1.5. A decrease in the friction factor is observed with the decrease in the value of (Rw), particularly at higher Reynolds number. The lower friction in the case of tubes with splitter plate may be attributed to the symmetrical vortex shedding in the wake which results in lower pressure drop as compared to the tube bank without a splitter plate. This observation is in line with the study of Yasuo et al. [19].