Experimental Investigation of Subsonic Turbulent Flow Over Single and Double Backward Facing Steps

Abbott, D. E.; Kline, S. J.

doi:10.1115/1.3657313

Cited by 232 publications

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“…Tables 2 and 17 3. of the inlet section of the reservoir, leading to the formation of a small circulation zone in 24 each upstream corner. This zone was not drawn as a two-dimensional circulation in Figure 3because dye visualization highlighted three-dimensional effects (vertical eddies); this 1 behavior is consistent with the observations of Abbott and Kline (1962). 2 3 Symmetry disappeared when increasing the length of the reservoir to 2.20 m. The jet was 4 deflected on one side of the reservoir.…”

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confidence: 72%

Experimental investigation of flow pattern and sediment deposition in rectangular shallow reservoirs

Dufresne

Dewals

Erpicum

et al. 2010

International Journal of Sediment Research

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6This work involved the experimental investigation of flow pattern, preferential regions of 7 deposition and trap efficiency as a function of the length of rectangular shallow reservoirs. 8Four flow patterns were identified (from longer to shorter reservoirs): an asymmetric flow 9 with two reattachment points, an asymmetric flow with one reattachment point, an unstable 10 flow, and a symmetric flow without any reattachment point. Using dye visualizations, the 11 median value and the temporal variability of the reattachment lengths were precisely 12 measured for the asymmetric flows. For each stable flow, sediment tests with plastic particles 13 were carried out. The regions of deposition on the bed of the reservoir were clearly a function 14 of the flow pattern. The transition from an asymmetric flow pattern to a symmetric flow 15 pattern was responsible for an abrupt decrease of the trap efficiency; a number of regression 16 laws were discussed to take it into account. 17 18

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confidence: 72%

Experimental investigation of flow pattern and sediment deposition in rectangular shallow reservoirs

Dufresne

Dewals

Erpicum

et al. 2010

International Journal of Sediment Research

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“…The recirculation zones lenghts are defined where the velocity reverts the direction in these lines. This results agree with Abbott and Kline (1962), which measures the upper and lower recirculation zone lengths in a square profile duct with sudden expansion. For an expansion ratio of 1.8, approximately the value for ORACLES test rig, the author obtained the length of 10 H and 4 H. In this study these values are 12 H and 4 H, representing a good agreement.…”

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confidence: 82%

Numerical Study of the b-Ξ Flame Wrinkling Combustion Model in ORACLES Test Rig

Santos

Dourado

2015

J.Aerosp. Technol. Manag.

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Numerical modeling of premixed combustion is important for a wide range of machines and systems focusing on compliance with the increasing pollutants reduction requirements. However good industrial numerical combustion models need a practical requiring, in this way, a balance between speed and accuracy. The flamelet models are suitable for this purpose providing a decoupling of the reactive and fluid dynamic problems, and an important model of this family is the b-Ξ flame surface wrinkling model. A specially challenging experiment to test this combustion model is the ORACLES test rig whose two independent parallel inlet channels consistently influence the turbulent combustion, injecting fuel and oxydizer at different equivalence ratios. The b-Ξ flamelet combustion model is known by the sensibility to numerical schemes and boundary conditions and, based on this, the present study proposes to investigate the coupling with the important SST k-ω turbulence model and achieve good balance among accuracy, boundedness, stability and efficiency using the ORACLES experiment.

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“…Nufd=C ·Red, o. s,pro· 4 Thus to determine the fully developed Nusselt number we must first determine the Reynolds and Prandtl numbers. Now since air was used as the working flulid the Prandtl number was almost constant for the working range and was assumed to be 0.7.…”

Section: Nux=hx•d Kmentioning

confidence: 99%

Heat Transfer in Turbulent Separated Flow

Smyth

1974

J. Nucl. Sci. Technol.

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An investigation was carried out with the object of determining the physical effects of separation and the associated reattachment and redevelopment, upon the heat transfer characteristics of turbulent flow in pipes and to compare the results of these flow conditions with the fully developed one-dimensional condition and with a recently developed numerical technique for the solution of recirculating flows.Separation of the flow was induced in a 4ft length of 2 in. internal diameter nicrome tube of wall thickness 0.001 in. by means of a sudden enlargement of diameter at the entry of the tube. The tube was electrically heated by the passage of a current along its length. The first 25 in. of the tube was metered by thermocouples which gave the wall temperatures and from these the local heat transfer rates and Reynolds numbers up to 5 X 10 4 using air as the working fluid.

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Experimental Investigation of Subsonic Turbulent Flow Over Single and Double Backward Facing Steps

Cited by 232 publications

References 0 publications

Experimental investigation of flow pattern and sediment deposition in rectangular shallow reservoirs

Experimental investigation of flow pattern and sediment deposition in rectangular shallow reservoirs

Numerical Study of the b-Ξ Flame Wrinkling Combustion Model in ORACLES Test Rig

Heat Transfer in Turbulent Separated Flow

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