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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

An investigation of pressure drag in transonic flow by the method of hydraulic analogy

Stancil, Robert Thomas 08 1900 (has links)
No description available.

An investigation of base pressure ratios of blunt based-bodies by the method of hydraulic analogy

McAllister, Jack Donald 12 1900 (has links)
No description available.

Excrescence effects on a turbulent boundary layer in an adverse pressure gradient

Humphries, P. A. January 2001 (has links)
No description available.

Modification of turbulent structure in channel flows by microbubble injection close to the wall

Gutierrez Torres, Claudia del Carmen 01 November 2005 (has links)
An investigation of turbulent structure modification of a boundary layer for a fully developed channel flow by microbubble injection close to the upper wall was carried out using Particle Image Velocimetry (PIV). Two-dimensional velocity components in an x-y plane at Reynolds number of 5128 based on the half height of the channel and bulk velocity were measured. Microbubbles, with an average diameter of 30 ??m were produced by electrolysis and injected in the buffer layer. Different values of the void fraction were attained and used to evaluate the effects of the presence of microbubbles and their concentration within the boundary layer. A reduction in drag was observed due to the injection of microbubbles. Drag reduction augments as the value of the void fraction increases. Furthermore, increases in both the non-dimensional values of streamwise and normal turbulent intensities, normalized by the friction velocity were observed with the void fraction growth. A gradual decrease in the Reynolds shear stresses was achieved as the void fraction increases. This effect is due to a ??decorrelation?? or ??decoupling?? between the streamwise and normal fluctuating velocities. Modifications in the length and time scales due to the presence of microbubbles were detected by calculating two-point correlation coefficients in one and two dimensions and the autocorrelation coefficient at various locations within the measurement zone. Streamline length and time scales were increased. On the contrary, the normal length and time scales were decreased. The vorticity and strain rate values decreased with the injection of microbubbles. Turbulent energy production was also decreased within the boundary layer. Quadrant analysis was used to find out the contribution of the u?? and v?? fluctuating velocity components to the Reynolds stress. The presence of microbubbles reduces the contribution to the Reynolds stresses by Q4 events (sweeps), which are responsible for the production of skin friction. Vortical structure detection in the measurement area was pursued. The structure with and without the microbubble injection is compared. In this study the presence of microbubbles within the boundary layer has produced several modifications in the flow structure as well as reduction in the drag.

The form drag of two-dimensional bluff-plates immersed in turbulent shear flows

Good, Malcolm Campbell January 1965 (has links) (PDF)
The literature concerning bluff-body flows in two-dimensional, incompressible, sheared and unsheared streams is reviewed. It is found that no theory yet exists which can predict the form drag of a bluff body without some recourse to experimental data, even for the simple case of an isolated bluff-plate in an unsheared stream. In the present state of knowledge, and considering the complexity of turbulent shear flows, a theory for the form drag of bluff-plates immersed in turbulent boundary-layers seems remote. A correlation scheme is proposed to relate the form drag of a bluff-plate which is attached to a smooth-wall with the mean-flow characteristics of the naturally-developed, turbulent boundary-layer in which it is immersed. The investigation is limited to smooth-wall flows of the type described by Coles (1956). It is suggested that, for bluff-plates which are small compared with the boundary-layer thickness, the drag might depend only on the “wall variables”: wall shear-stress, fluid density and viscosity, and the plate height.

The Queer carnival : gender transgressive images in contemporary Queer performance and their relationship to carnival and the Grotesque

Bayley, Bruce Howard January 2000 (has links)
No description available.

Roughness measurements of ship plates and their correlation with hydrodynamic drag

Chuah, K-B. January 1986 (has links)
No description available.

Numerical optimization of the suction distribution for laminar flow control aerofoils

Hackenberg, Petra January 1994 (has links)
No description available.

An investigation into the aerodynamics of Gurney flaps

Jeffrey, David Robert Michael January 1998 (has links)
No description available.

The automatic control of boundary layer transition

Rioual, Jean-Luc January 1994 (has links)
No description available.

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