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Flow separation

About: Flow separation is a research topic. Over the lifetime, 16708 publications have been published within this topic receiving 386926 citations.


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Journal ArticleDOI
TL;DR: In this article, the authors propose a method for customizing a page view by dragging and re-positioning the boxes below the boxes. But this method is limited to a single page view.
Abstract: Related Content Customize your page view by dragging and repositioning the boxes below. Related Journal Articles

1,229 citations

Book
01 Jan 1975
TL;DR: In this article, the authors present an approach for the analysis of flow properties and properties in a 3D manifold with respect to velocity, acceleration, and velocity distribution, and the Bernoulli Equation.
Abstract: PREFACE. CHAPTER 1 Introduction. 1.1 Liquids and Gases. 1.2 The Continuum Assumption. 1.3 Dimensions, Units, and Resources. 1.4 Topics in Dimensional Analysis. 1.5 Engineering Analysis. 1.6 Applications and Connections. CHAPTER 2 Fluid Properties. 2.1 Properties Involving Mass and Weight. 2.2 Ideal Gas Law. 2.3 Properties Involving Thermal Energy. 2.4 Viscosity. 2.5 Bulk Modulus of Elasticity. 2.6 Surface Tension. 2.7 Vapor Pressure. 2.8 Summary. CHAPTER 3 Fluid Statics. 3.1 Pressure. 3.2 Pressure Variation with Elevation. 3.3 Pressure Measurements. 3.4 Forces on Plane Surfaces (Panels). 3.5 Forces on Curved Surfaces. 3.6 Buoyancy. 3.7 Stability of Immersed and Floating Bodies. 3.8 Summary. CHAPTER 4 Flowing Fluids and Pressure Variation. 4.1 Descriptions of Fluid Motion. 4.2 Acceleration. 4.3 Euler's Equation. 4.4 Pressure Distribution in Rotating Flows. 4.5 The Bernoulli Equation Along a Streamline. 4.6 Rotation and Vorticity. 4.7 The Bernoulli Equation in Irrotational Flow. 4.8 Separation. 4.9 Summary. CHAPTER 5 Control Volume Approach and Continuity Equation. 5.1 Rate of Flow. 5.2 Control Volume Approach. 5.3 Continuity Equation. 5.4 Cavitation. 5.5 Differential Form of the Continuity Equation. 5.6 Summary. CHAPTER 6 Momentum Equation. 6.1 Momentum Equation: Derivation. 6.2 Momentum Equation: Interpretation. 6.3 Common Applications. 6.4 Additional Applications. 6.5 Moment-of-Momentum Equation. 6.6 Navier-Stokes Equation. 6.7 Summary. CHAPTER 7 The Energy Equation. 7.1 Energy, Work, and Power. 7.2 Energy Equation: General Form. 7.3 Energy Equation: Pipe Flow. 7.4 Power Equation. 7.5 Contrasting the Bernoulli Equation and the Energy Equation. 7.6 Transitions. 7.7 Hydraulic and Energy Grade Lines. 7.8 Summary. CHAPTER 8 Dimensional Analysis and Similitude. 8.1 Need for Dimensional Analysis. 8.2 Buckingham Theorem. 8.3 Dimensional Analysis. 8.4 Common-Groups. 8.5 Similitude. 8.6 Model Studies for Flows Without Free-Surface Effects. 8.7 Model-Prototype Performance. 8.8 Approximate Similitude at High Reynolds Numbers. 8.9 Free-Surface Model Studies. 8.10 Summary. CHAPTER 9 Surface Resistance. 9.1 Surface Resistance with Uniform Laminar Flow. 9.2 Qualitative Description of the Boundary Layer. 9.3 Laminar Boundary Layer. 9.4 Boundary Layer Transition. 9.5 Turbulent Boundary Layer. 9.6 Pressure Gradient Effects on Boundary Layers. 9.7 Summary. CHAPTER 10 Flow in Conduits. 10.1 Classifying Flow. 10.2 Specifying Pipe Sizes. 10.3 Pipe Head Loss. 10.4 Stress Distributions in Pipe Flow. 10.5 Laminar Flow in a Round Tube. 10.6 Turbulent Flow and the Moody Diagram. 10.7 Solving Turbulent Flow Problems. 10.8 Combined Head Loss 10.9 Nonround Conduits. 10.10 Pumps and Systems of Pipes. 10.11 Summary. CHAPTER 11 Drag and Lift. 11.1 Relating Lift and Drag to Stress Distributions. 11.2 Calculating Drag Force. 11.3 Drag of Axisymmetric and 3D Bodies. 11.4 Terminal Velocity. 11.5 Vortex Shedding. 11.6 Reducing Drag by Streamlining. 11.7 Drag in Compressible Flow. 11.8 Theory of Lift. 11.9 Lift and Drag on Airfoils. 11.10 Lift and Drag on Road Vehicles. 11.11 Summary. CHAPTER 12 Compressible Flow. 12.1 Wave Propagation in Compressible Fluids. 12.2 Mach Number Relationships. 12.3 Normal Shock Waves. 12.4 Isentropic Compressible Flow Through a Duct with Varying Area. 12.5 Summary. CHAPTER 13 Flow Measurements. 13.1 Measuring Velocity and Pressure 13.2 Measuring Flow Rate (Discharge). 13.3 Measurement in Compressible Flow. 13.4 Accuracy of Measurements. 13.5 Summary. CHAPTER 14 Turbomachinery. 14.1 Propellers. 14.2 Axial-Flow Pumps. 14.3 Radial-Flow Machines. 14.4 Specific Speed. 14.5 Suction Limitations of Pumps. 14.6 Viscous Effects. 14.7 Centrifugal Compressors. 14.8 Turbines. 14.9 Summary. CHAPTER 15 Flow in Open Channels. 15.1 Description of Open-Channel Flow. 15.2 Energy Equation for Steady Open-Channel Flow. 15.3 Steady Uniform Flow. 15.4 Steady Nonuniform Flow. 15.5 Rapidly Varied Flow. 15.6 Hydraulic Jump. 15.7 Gradually Varied Flow. 15.8 Summary. Appendix A-1. Answers A-11. Index I-1.

1,166 citations

01 Jan 1955
TL;DR: In this article, the results of an experimental investigation of a turbulent boundary layer with zero pressure gradient are presented and the importance of the region near the wall and the inadequacy of the concept of local isotropy are demonstrated.
Abstract: The results of an experimental investigation of a turbulent boundary layer with zero pressure gradient are presented. Measurements with the hot-wire anemometer were made of turbulent energy and turbulent shear stress, probability density and flattening factor of u-fluctuation (fluctuation in x-direction), spectra of turbulent energy and shear stress, and turbulent dissipation. The importance of the region near the wall and the inadequacy of the concept of local isotropy are demonstrated. Attention is given to the energy balance and the intermittent character of the outer region of the boundary layer. Also several interesting features of the spectral distribution of the turbulent motions are discussed.

1,122 citations

DissertationDOI
01 Mar 1953
TL;DR: In this article, the authors investigated the wake development behind circular cylinders at Reynolds numbers from 40 to 10,000 in a low-speed wind tunnel and found that in the stable range the vortex street has a periodic spanwise structure.
Abstract: Wake development behind circular cylinders at Reynolds numbers from 40 to 10,000 was investigated in a low-speed wind tunnel. Standard hotwire techniques were used to study the velocity fluctuations. The Reynolds number range of periodic vortex shedding is divided into two distinct subranges. At R = 40 to 150, called the stable range, regular vortex streets are formed and no turbulent motion is developed. The range R = 150 to 300 is a transition range to a regime called the irregular range, in which turbulent velocity fluctuations accompany the periodic formation of vortices. The turbulence is initiated by laminar-turbulent transition in the free layers which spring from the separation points on the cylinder. This transition first occurs in the range R = 150 to 300. Spectrum and statistical measurements were made to study the velocity fluctuations. In the stable range the vortices decay by viscous diffusion. In the irregular range the diffusion is turbulent and the wake becomes fully turbulent in 40 to 50 diameters downstream. It was found that in the stable range the vortex street has a periodic spanwise structure. The dependence of shedding frequency on velocity was successfully used to measure flow velocity. Measurements in the wake of a ring showed that an annular vortex street is developed.

1,082 citations

01 Jun 1953
TL;DR: In this paper, a hot-wire anemometer was used to measure the turbulent flow in a 10-inch pipe at speeds of approximately 10 and 100 feet per second, and the results include relevant mean and statistical quantities, such as Reynolds stresses, triple correlations, turbulent dissipation, and energy spectra.
Abstract: Measurements, principally with a hot-wire anemometer, were made in fully developed turbulent flow in a 10-inch pipe at speeds of approximately 10 and 100 feet per second. Emphasis was placed on turbulence and conditions near the wall. The results include relevant mean and statistical quantities, such as Reynolds stresses, triple correlations, turbulent dissipation, and energy spectra. It is shown that rates of turbulent-energy production, dissipation, and diffusion have sharp maximums near the edge of the laminar sublayer and that there exist a strong movement of kinetic energy away from this point and an equally strong movement of pressure energy toward it.

1,053 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023177
2022333
2021361
2020394
2019403
2018371