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# The stability of two-phase flow over a swept-wing

Written in English

## Subjects:

• Air flow.,
• Boundary layer flow.,
• Flat plates.,
• Flow stability.,
• Porous plates.,
• Two phase flow.,
• Water flow.

Edition Notes

## Book details

The Physical Object ID Numbers Other titles Stability of two phase flow over a swept wing. Statement Adrian V. Coward, Philip Hall. Series ICASE report -- no. 94-86., NASA contractor report -- 194994., NASA contractor report -- NASA CR-194994. Contributions Hall, Philip., Institute for Computer Applications in Science and Engineering. Format Microform Pagination 1 v. Open Library OL18079963M

The stability of two-phaseflow over a swept wing geometry of the problem and incorporates surface tension forces, gravity, and volume ratios for example. Since Yih’s work, there have been numerous investigations of interfacial instability which have important applications in many situations.

For example, BlennerhassettCited by: 5. The stability of two-phase flow over a swept wing - Volume - Adrian V. Coward, Philip Hall Skip to main content We use cookies to distinguish you from other users and to provide you with a better experience on our by: 5.

We use numerical and asymptotic techniques to study the stability of a twophase air/water flow above a flat porous plate. This flow is a model of the boundary layer which forms on a yawed cylinder and can be used as a useful approximation to the air flow over swept wings during heavy rainfall.

We use numerical and asymptotic techniques to study the stability ofatwophase air/water owabovea at porous plate. This flow is a model of the boundary layer which forms on a yawed cylinder and can be used as a useful approximation to the air flow over swept wings during heavy rainfall.

adshelp[at] The ADS is operated by the Smithsonian Astrophysical The stability of two-phase flow over a swept-wing book under NASA Cooperative Agreement NNX16AC86A. TY - JOUR. T1 - The stability of two-phase flow over a swept wing.

AU - Coward, A.V. AU - Hall, P. N1 - Cited By:7 Export Date: 19 August We use numerical and asymptotic techniques to study the stability of a two-phase air/water flow above a flat porous plate. This flow is a model of the boundary layer which forms on a yawed cylinder and can be used as a useful approximation to the air flow over swept wings during heavy rainfall.

We use numerical and asymptotic techniques to study the stability of a two-phase air/water flow above a flat porous plate. This flow is a model of the boundary layer which forms on a yawed cylinder and can be used as a useful approximation to the air flow over swept wings.

CROSSFLOW STABILITY AND TRANSITION EXPERIMENTS IN A SWEPT-WING FLOW J. Ray Dagenhart An experimental examination of crossflow instability and transition on a 45° swept wing is conducted in the Arizona State University Unsteady Wind Tun-nel.

The stationary-vortex pattern and transition location are visualized using. A general class of incompressible two-phase flow models containing only algebraic and first-order differential terms is considered. It is shown that the stability of this class of models is independent of the wavenumber of the perturbations.

Therefore hyperbolicity is a necessary, although not sufficient, condition for stability. Two phase ﬂow – ﬂow regimes Pressure variations are inevitable in most two phase ﬂow regimes. Average pressure changes slowly along the pipe. Flow regimes – concluding remarks Over one hundred ﬂow regime maps exist, based on different classiﬁcation into regimes.

Get this from a library. The stability of two-phase flow over a swept-wing. [Adrian V Coward; Philip Hall; Institute for Computer Applications in Science and Engineering.]. Mode coalescence in a two-fluid boundary-layer stability problem Physics of Flu ( “ The stability of two-phase flow over a swept wing,” J.

Fluid Mech. “ The hydrodynamic stability of flow over Kramer-type compliant surfaces. Summary. The linear stability of incompressible boundary-layer flow of dusty gas is considered. Eigenvalue problem for modified Orr-Sommerfeld equation is solved numerically using two approaches: a) directly by orthonormalization method, and b) by perturbation method.

Amir Faghri, Yuwen Zhang, in Transport Phenomena in Multiphase Systems, Two-Phase Flow. Two-phase flow refers to the interactive flow of two distinct phases with common interfaces in a channel, with each phase representing a mass or volume of matter.

The two phases can exist as combinations of solid, gas and/or liquid phases. Although multiphase flow involving three phases can. Similarity solutions for laminar two-fluid jets and wakes are derived in the boundary-layer approximation. Planar and axisymmetric fan jets as well as classical and momentumless planar wakes are considered.

The interface between the immiscible fluids is stabilized by the action of gravity, with the heavier fluid, taken to be a liquid, placed beneath the lighter fluid. Kennedy et al. [23] studied the onset of flow instability in copper microtubes of diameters and mm using degassed and deionized water as the fluid.

To induce the flow instability, two different methods were adopted. Either flow rate was reduced from an initial high value, or, for a fixed flow.

slug flow, annular flow). Therefore, stability analysis of stratified flow is considered a basic tool to be employed in the modelling of flow pattern transitions and for the prediction of the flow pattern map that is pertinent to the particular two-phase flow system of interest.

context though reference to books providing such reviews is included where appropriate. This book is targeted at graduate students and researchers at the cutting edge of investigationsinto the fundamental nature of multiphase ﬂows; it is intended as a reference book for the basic methods used in the treatment of multiphase ﬂows.

This graduate text provides a unified treatment of the fundamental principles of two-phase flow and shows how to apply the principles to a variety of homogeneous mixture as well as separated liquid-liquid, gas-solid, liquid-solid, and gas-liquid flow problems, which Format: Hardcover.

The flow of two immiscible liquids is explained in chapter 9. It is shown that the ratio of the viscosities of both phases determines the behavior during a displacement process. Attention is paid to the size of the front zone, separating the two liquids. Further, the stability of the front is analysed.

This graduate text provides a unified treatment of the fundamental principles of two-phase flow and shows how to apply the principles to a variety of homogeneous mixture as well as separated liquid-liquid, gas-solid, liquid-solid, and gas-liquid flow problems, which may be steady or transient, laminar or chapter contains several sample problems, which illustrate the 4/5(1).

On a straight wing airplane, all of the airflow over the wing travels parallel to the aircraft's chord line. But, on a swept wing, only some of the air flows parallel to the chord line.

The other part flows perpendicular to the chord - this is called spanwise flow. A swept wing is a wing that angles either backward or occasionally forward from its root rather than in a straight sideways direction.

Swept wings have been flown since the pioneer days of aviation. Wing sweep at high speeds was first investigated in Germany as early asfinding application just before the end of the Second World has the effect of delaying the shock waves and.

It will be essential for graduate courses on two-phase flow, boiling, and condensation, and an ideal reference for researchers and professionals.

About the Author S. Mostafa Ghiaasiaan is a Professor in the George W. Woodruff School of Mechanical Engineering at Georgia Institute of s: 2. The stability of two-phase flow over a swept wing Coward A.V. & Hall P., Journal of Fluid Mechanics,/- (). In English. We use numerical and asymptotic techniques to study the stability of a two-phase air/water flow above a flat porous plate.

DeepDyve is the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

DeepDyve is the easiest way to get instant access to the academic journals you need. Annular Two-Phase Flow presents the wide range of industrial applications of annular two-phase flow regimes.

This book discusses the fluid dynamics and heat transfer aspects of the flow pattern. Organized into 12 chapters, this book begins with an overview of the classification of the various types of interface distribution observed in practice.

How a Coriolis mass flow meter can operate in two phase (gas/liquid) flow density errors over a wide range of two-phase conditions.

the trade-off is the difficu lty to maintain stability. This IMA Volume in Mathematics and its Applications TWO PHASE FLOWS AND WAVES is based on the proceedings of a workshop which was an integral part of the IMA program on NONLINEAR WAVES.

The workshop focussed on the development of waves in flowing composites. We thank the Coordinating Commit tee: James Glimm, Daniel Joseph, Barbara Keyfitz, Andrew Majda, Alan Newell.

This graduate text provides a unified treatment of the fundamental principles of two-phase flow and shows how to apply the principles to a variety of homogeneous mixture as well as separated liquid-liquid, gas-solid, liquid-solid, and gas-liquid flow problems, which may be steady or transient, laminar or chapter contains several sample problems, which illustrate the outlined.

NASA/TP Crossﬂow Stability and Transition Experiments in Swept-Wing Flow J. Ray Dagenhart Langley Research Center, Hampton, Virginia. It is all associated with the way the air flows over the wings. When an aircraft rolls to the left, the sweep angle on the left wing reduces, while the sweep angle on the right increases.

This makes the left wing create more lift than the right wi. When a swept wing travels at high speed, the airflow airflow is moving along the wing instead of over it, a problem known as spanwise flow.

The lift from a wing is generated by the airflow over it from front to rear. With increasing span-wise flow the boundary layers on the achieve a sufficient stability). Directional stability. When a swept wing is flying in a sideslip, the windward side behaves like a wing with less effective sweep $\varphi_{eff}$ and the leeward side like one with more effective sweep.

Wing sweep causes a flattening of the lift curve slope for two reasons: The effective angle of attack is reduced by the cosine of the sweep angle. Swept-Wing Flow Instability Wave crisis on the aircraft lifting surfaces is the main obstacle to the increase of the flight speed.

A lifting surface of a swept shape allows to postpone the beginning of the wave crisis up to the speeds corresponding to Mach numbers due to three-dimensional effects appearing in case of the flow over a. The thicker the wing (and the more it needs to displace), the more spanwise flow in a swept wing.

Same thing goes for tip vortices - they're the end result of the spanwise flow meeting. There have been a few planes with forward swept wings (a glider comes to mind) where the spanwise flow actually goes inwards, towards the fuselage. resorting to an empirical flow map (see Figure 4).

Note that such maps depend on the fluid, pressure and channel geometry, i.e., there is no “universal” map for two‐phase flow regimes.

However, there exist methods to generate a flow map for a particular fluid, pressure and geometry. These methods will be covered in and ISBN: OCLC Number: Notes: At head of title: International Union of Theoretical and Applied Mechanics.

Papers presented at the Fourth Symposium on Laminar-Turbulent Transition held on the 5th to 9th of September,at the Sendai International Center in. Bai B F, Zhang S J, zhang X M, Zhao L, Guo L J Online recognition of the multiphase flow regime Sci China Ser E-Tech Sci 51 (8) Google Scholar Banjamin TB shearing flow over a wavy surface Mech.

Finally, several slope failure assessments were conducted to evaluate the usefulness of using the two-phase flow model in forecasting slope stability in conditions of increased rainfall sums.

We observed that the two-phase flow model reduces the tendency of over .There are a number of instabilities that may occur in two-phase systems. These may be classified into static and dynamic instabilities [Lahey andPodowski ()].

Examples of static instabilities include: flow excursion (i.e., Ledinegg) instabilities, flow regime relaxation instabilities, geysering or chugging instabilities and the terrain.The stability of the Two-Fluid Model (TFM) is an outstanding problem since the inception more than 40 years ago. The difficulty stems from the combined challenges of turbulence in each fluid field.

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