Author: Douglas Eugene AbbottPublisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 116
Book Description
Theoretical and Experimental Investigation of Flow Over Single and Double Backward Facing Steps
Author: Douglas Eugene AbbottPublisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 116
Book Description
Theoretical and Experimental Investigation of Flow Over Single and Double Backward Facing Steps
Author: Stanford University. Thermosciences Division. Thermosciences DivisionPublisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 118
Book Description
A semi-empirical analysis is developed for the over-all flow pattern of subsonic turbulent flow over backward facing steps. Good agrement is found between theory and experiment for the prediction of two-dimensional reattachment length for small values of step height to throat width ratio; an asymptotic solution for large values of step height is also given and discussed. Mean velocity profiles calculated by the present analysis are shown; they require an empirical fit at one point. Good agreement with experiment is found in the region near the step face, but agreement is poor near the reattachment region. Experimental results are represented for flow patterns over backward facing steps covering a wide range of geometric variables. Velocity profile measurements are given for both single and double steps. The stall region is shown to consist of a complex pattern involving three distinct regions. The double step contains an asymmetry for large expansions, but approaches the single-step configuration with symmetric stall regions for small values of area ratio. No effect on flow pattern or reattachment length is found for a wide range of Reynolds numbers and turbulence intensities, provided the flow is fully turbulent before the step. (Author).
I. Theoretical and Experimental Investigation of Flow Over Single and Double Backward Facing Steps
Author: Douglas Eugene AbbottPublisher:
ISBN:
Category : Hydrodynamics
Languages : en
Pages : 356
Book Description
An Analytical and Experimental Study of the Plane, Incompressible, Turbulent Free Shear Layer with Arbitrary Velocity Ratio and Pressure Gradient
Author: Cullen Milo SabinPublisher:
ISBN:
Category : Shear flow
Languages : en
Pages : 128
Book Description
A first order approximation is derived in similarity coordinates for the velocity variation across a mixing zone between two streams of different velocities in an arbitrary pressure gradient. The velocity profiles obtained are functions of a single parameter, the ratio of the velocity of the slow stream to that of the fast stream. The first order velocity profiles are compared to those obtained from the complete solution to the zero pressure gradient case by Gortler and good agreement is found when the velocity ratio is greater than 0.5. The form of the eddy diffusivity appropriate to the first order theory is determined from analysis and experimental data. This form leads to an explicit transformation for the similarity coordinate requiring only a single empirical constant for all cases. This similarity coordinate is shown to reduce to Gortler's variable in the constant pressure case. Expressions for the shear and the mixing layer width for the general case are presented, and shown to check the data from several cases. A hot wire anemometer which was specially designed and constructed for taking the experimental data in a water channel is described. (Author).
NASA Technical Note
Author: Surface Pressure and Turbulent Airflow in Transverse Rectangular Notches
Author: Jay FoxPublisher:
ISBN:
Category : Atmospheric turbulence
Languages : en
Pages : 34
Book Description
Second UK National Conference on Heat Transfer: Sessions 4A-6C
Author: Computational and Information Technologies in Science, Engineering and Education
Author: Yuri ShokinPublisher: Springer
ISBN: 3030122034
Category : Computers
Languages : en
Pages : 259
Book Description
This book constitutes the refereed proceedings of the 9th International Conference on Computational and Information Technologies in Science, Engineering and Education, CITech 2018, held in Ust-Kamenogorsk, Kazakhstan, in September 2018. The 25 revised full papers presented were carefully reviewed and selected from 64 submissions. The papers address issues such as mathematical and computer modeling, fundamental problems of mathematics, technological aspects of the applications of parallel computer systems, high level parallel programming languages and systems.
Second UK National Conference on Heat Transfer, 14-16 September 1988, University of Strathclyde, Glasgow
Author: OAR Quarterly Index of Current Research Results
Author: United States. Air Force. Office of Aerospace ResearchPublisher:
ISBN:
Category : Aeronautics, Military
Languages : en
Pages : 800
Book Description