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3 edition of **Backward-facing step measurements at low Reynolds number, Re [lower case h]=500** found in the catalog.

Backward-facing step measurements at low Reynolds number, Re [lower case h]=500

Srba Jovic

- 187 Want to read
- 11 Currently reading

Published
**1994**
by National Aeronautics and Space Administration, Ames Research Center, National Technical Information Service, distributor in Moffett Field, Calif, [Springfield, Va
.

Written in English

- Laser Doppler velocimeter.

**Edition Notes**

Other titles | Backward facing step measurements at low Reynolds number, Re [lower case h]=500. |

Statement | Srba Jovic and David M. Driver. |

Series | NASA technical memorandum -- 108807. |

Contributions | Driver, David M., Ames Research Center. |

The Physical Object | |
---|---|

Format | Microform |

Pagination | 1 v. |

ID Numbers | |

Open Library | OL18072636M |

Full text of "Flow control [electronic resource]: fundamentals and practices" See other formats. Hence, for a constant Oh number, increase in the Weber number or the Reynolds number results in enhanced atomization characteristics of the turbulent liquid jet. 23 Figure Different breakup regimes based on Reynolds number [1, 2] Farago et al. [11] characterized different breakup behavior displayed by round liquid jets in a coaxial.

Hot-wire measurement technique was used to measure three Reynolds stresses and higher-order mean products of velocity fluctuations. The Reynolds number, Re(sub h), based on the step height, h, and the reference velocity, U(sub 0), The upstream oncoming flow was fully developed turbulent boundary layer with the Re(sub theta) = Large-eddy simulation of a backward facing step flow using a least-squares spectral element method. NASA Technical Reports Server (NTRS) Chan, Daniel C.; Mittal, Rajat. We report preliminary results obtained from the large eddy simulation of a backward facing step at a Reynolds number of The numerical platform is based on a high order .

Test Case Turbulent flow over a backward facing step is modeled. The flow separates at the step and reattaches on the wall downstream, enclosing a region of recirculation. The inlet is at 4 H upstream and the outlet at 30 H downstream from the location of the step, where H is the step height. Reynolds number based on the step-height is about 5/5(1). His observations led to identification of a single dimensionless parameter, now called the Reynolds number, and denoted Re, ρU L, () Re = µ that completely characterizes flow behavior in this situation. In this expression ρ and µ are, respectively, the fluid properties density and dynamic viscosity.

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Backward-Facing Step Measurements at Low Reynolds Number, Reh= Srba Jovic* and David M. Driver Ames Research Center Summary An experimental study of Re [lower case h]=500 book flow over abackward-facing step at low Reynolds number was performed for the pur-pose of validating a direct numerical simulation (DNS) which was performed by the Stanford/NASA Center forFile Size: 2MB.

Get this from a library. Backward-facing step measurements at low Reynolds number, Re [lower case h]= [Srba Jovic; David M Driver; Ames Research Center.].

Backward-Facing Step Flows for Various Expansion Ratios at Low and Moderate Reynolds Numbers This paper is concerned with the behavior of ﬂows over a backward-facing step geometry for various expansion ratios H/h, and A literature survey was carried. Re h. Reynolds number based on the step height.

s′ In detail, it is numerically predicted that 3-D effects will become important when Re >Backward-facing step measurements at low Reynolds number, Reh =NASA Technical Memorandum,Google ScholarCited by: Experimental and Theoretical Investigation of Backward-Facing Step Flow of air in a Reynolds-number range of 70 Re.

The complex turbulent flow behind a backward-facing step is modelled using a full Reynolds stress closure. In order to develop a closure model that can resolve the complex near-wall flow in the recirculation region and in the recovery region downstream of the reattachment point, the performance of a low and a high Reynolds number version of the full Reynolds Cited by: This experiment was basically performed for a backward facing step, for a range of Reynolds number (based on step height) from to At Reynolds number offlow is laminar and transition occurs between Reynolds number of and The height of step was 4 mm and width of the domain.

In this case the ratio of step height to outlet channel height is and the Reynolds number based on the step height and is 44, The domain is sketched in Figure Figure Geometry of the backward facing step flow.

Inlet profiles for velocities and turbulence quantities are specified at 4 step heights upstream of the step corner.

The internal flow over a backward-facing step in the transitional regime (ReD = ) was studied based on direct numerical simulations. The predictions were carried out with the help of a finite.

Mehrez, Z., et al.: Mass Transfer Control of a Backward-Facing Step THERMAL SCIENCE, YearVol. 15, No. 2, pp. These approximations were used by [15]. In addition, in our work, the depth step is greater than 10h, where h is the height of the step (see fig. 1), which allows us to consider,Cited by: 9.

Coherent vortex structures (CVS) are discovered for more than half a century, and they are believed to play a significant role in turbulence especially for separated flows. An experimental study is conducted for a pressured backward-facing step flow with Reynolds number (Reh) being and A synchronized particle image velocimetry (PIV) system is developed for Author: Fangfang Wang, Ang Gao, Shiqiang Wu, Senlin Zhu, Jiangyu Dai, Qian Liao.

Turbulence modi cation by particles 99 Channel ﬂow: Backward-facing step ﬂow: Channel half-width, h 20mm Step height, H mm Channel span mm Expansion ratio Centreline velocity, U0 ms−1 Aspect ratio Reh= U0h ReH = U0H The paper presents the direct numerical simulation (DNS) of a confined backward facing (BFS) step geometry with a flow of two fluids with Prandtl numbers and The expansion ratio of the BFS geometry is equal to and the outflow of the geometry has a shape of a by: 2.

Numerical simulations of laminar flow over a 3D backward‐facing step Numerical simulations of laminar flow over a 3D backward‐facing step Williams, P.

T.; Baker, A. WILLIAMS1* AND A. BAKER2 Computational Physics and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, TNU.S.A.

2 Department of Engineering. Armaly et al. adopted experimental measurements of velocity in three dimensional laminar separated flows on backward facing step by using two components laser Doppler velocimeter with expansion ratio of and the range of Reynolds number from to and observed increase of recirculation regions with increase of Reynolds by: 2.

In this study, forced convection of Fe 3 O 4 –water nanofluid in a bifurcating channel was numerically studied under the influence of variable magnetic. Galerkin residual finite element method was used for numerical simulations.

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Particle image velocimetry (PIV) has evolved to be the dominant method for velocimetry in experimental fluid mechanics and has contributed to many advances in our understanding of turbulent and complex flows.

In this article we review the achievements of PIV and its latest implementations: time-resolved PIV for the rapid capture of sequences of vector fields; Cited by: Fluid Flow Pdf.

2. Presentation of the Case. The experiments are due to Almeida et al. (). The channel height is mm and the maximum height of the hill h max = 28 mm and the length mm.

The Reynolds number based on h max and the channel centre-line velocity (upstream of the hill) is 60, The measurements were taken in the vertical centre-plane of.Please read our short guide how to send a book to Kindle.

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