Journal ArticleDOI
Boundary-layer transition on a rotating cone in axial flow
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In this article, the structure of the laminar-turbulent transition region for the three-dimensional boundary layer along a 30° cone rotating in external axial flow is investigated.Abstract:
The purpose of the present paper is to investigate the structure of the laminar–turbulent transition region for the three-dimensional boundary layer along a 30° cone rotating in external axial flow. Spiral vortices, which were assumed as small disturbances in the present stability analysis, are observed experimentally in the transition region. The process of transition to a turbulent boundary layer is visualized in detail. When the ratio of rotational speed to external axial flow is increased, the critical and transition Reynolds numbers decrease remarkably. The spiral angle and the number of vortices appearing on the cone decrease as the rotational speed ratio is increased.read more
Citations
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Journal ArticleDOI
Stability of three-dimensional boundary layers
Helen L. Reed,William S. Saric +1 more
TL;DR: In this article, the crossflow instability and crossflow/Tollmien-Schlichting wave interactions are analyzed through the numerical solution of the full three-dimensional Navier-Stokes equations including unsteadiness, curvature, and sweep.
Journal ArticleDOI
Study on boundary layer transition of a rotating disk
TL;DR: In this paper, the behavior of spiral vortices being generated in transition regime of a disk rotating in otherwise undisturbed fluid is experimentally studied in detail through visualizations of the transition regime by using close-up camera.
Journal ArticleDOI
Control of stationary cross-flow modes in a Mach 3.5 boundary layer using patterned passive and active roughness
TL;DR: In this paper, a 3D boundary layer at Mach 3.5 was used for turbulent transition control on swept wings of a supersonic aircraft and the results indicated that the stationary cross-fl ow modes were highly receptive to the patterned roughness of both passive and active types.
Journal ArticleDOI
Stability of Bödewadt flow
TL;DR: In this paper, the boundary-layer transition over a stationary disk in rotating flow is studied experimentally and the critical Reynolds number Re = r(Ω/v)½ is determined from frequency and wavelength measurements to be about 25.
Journal ArticleDOI
Viscous flows and instabilities near rotating bodies
TL;DR: In this article, a survey of experiments on the flow near rotating bodies is presented, where the flow and the instabilities around, between and within these rotating bodies and combinations of them are investigated.
References
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Journal ArticleDOI
On the stability of three-dimensional boundary layers with application to the flow due to a rotating disk
TL;DR: In this paper, the boundary-layer instability is discussed from both theoretical and experimental points of view, and a variational method for the solution of certain of the eigenvalue problems associated with stability at infinite Reynolds number is derived, found by comparison with an exact solution to be very accurate.
Journal ArticleDOI
Spiral vortices in boundary layer transition regime on a rotating disk
TL;DR: In this article, the behavior of spiral vortices on a disk rotating in still fluid is studied theoretically and experimentally in detail, and the results show that the number of the spiral vortex is 31 or 32 as mean value and the gradient of the vortex axis decreases from 14° to 7° as the local Reynolds number is increased.
Journal ArticleDOI
Modes of instability in spiral flow between rotating cylinders
TL;DR: In this paper, an experimental investigation of the stability of spiral flow between rotating cylinders with respect to axisymmetric and nonaxismmetric disturbances was carried out, and the effect of small axial flow upon all of the modes was detected by observing visually characteristic ink patterns in the fluid.
Journal ArticleDOI
An electrochemical study of flow instability on a rotating disk
Der-Tau Chin,Mitchell Litt +1 more
TL;DR: In this article, the mass transfer coefficient to point electrodes on the surface of a rotating disk was analyzed for transition and turbulent flow, along with analysis of the energy spectrum, and it was shown that the electrochemical method gave a more sensitive probe of flow instabilities than has been possible previously.
Journal ArticleDOI
Heat and mass transfer from rotating cones
C. L. Tien,D. T. Campbell +1 more
TL;DR: In this article, heat transfer by convection from isothermal rotating cones is investigated experimentally by measuring the sublimation rate from naphthalene-coated cones and using the analogy between heat and mass transfer.
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