Adequate information is already available on flow through pipes and on flat plates under constant pressure. In pipes, where the stress does not vary along the wall, the velocity distribution is logarithmic for most of the flow region. For flat plates, where the wall stress decreases systematically in the downstream direction, the velocity profile concaves around the logarithmic law. Between these two cases remains a gap to be closed. This thesis concerns a theoretical and experimental investigation on a turbulent boundary layer where the pressure distribution is so arranged to give a constant stress along the wall as in pipes. Various sand roughnesses were used, and the distributions of mean velocity, pressure, and turbulence were measured at various sections. Chapter II concerns the theoretical and experimental study of the flow in this particular type of boundary layer, whereas in Chapter III the mean velocity distributions are examined in the light of earlier work on both rough and smooth walls, and the effect of roughness is investigated. Also a law for the velocity profile close to a smooth wall id derived, and an experiment on separation from a rough wall is reported. Chapter IV deals with turbulence measurements near rough walls, whereas Chapter V examines the usual methods of calculation for turbulent boundary layers under pressure gradients. In Chapter VI, loose sand was used for the boundary and the movement of grains was examined and compared with that in parallel flow.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:602188 |
| Date | January 1963 |
| Creators | El-Gawhary, Ali Ismail Ali |
| Contributors | White, C.M |
| Publisher | Imperial College London |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://hdl.handle.net/10044/1/13227 |
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