摘要:

A simple methode of the early behaviour of a density surge is developed on the basis of inviscid flow theory. Combining the surge picture with the behaviour of a vortex system in proximity to a surface, an estimate is obtained for the initial rate of spread of a buoyant density field.

ISSN:0022-1686    

DOI:10.1080/00221687609499683

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

The behaviour of isolated blocks of fluid propagating at the surface of a turbulent stream is predicted, applying the concepts of entrainment and the open parcel representation of invironmental mixing. The predictions are linked to the dispersion of a uniform density field released at the surface of a stream flow and apply to the phase of lateral spread following development of density surges at the field edges.

ISSN:0022-1686    

DOI:10.1080/00221687609499684

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

The oblique impingement of circular turbulent jets on smooth walls has been studied both experimentally and analytically. This type of flow represents a considerable degree of geometrical generality as the flow is three-dimensional in its main portion. An inductive, semi-empirical method has been developed to predict wall pressures in the impingement region. Wall shear stress in the same region has been measured on the symmetry plane and an analytical method has been presented for its prediction. For prediction of flow properties in the wall jet region, a theory has been developed which is based on boundary-layer approximations of the Reynolds equations of motion and upon the similarity of radial velocity profiles. It is shown that the flow is quasi-axisymmetric, i.e. flow takes place along radial lines with shear stresses between radial planes being very small. The thickness of the wall jet grows linearly on each radial at a universal slope. The local skin friction factor remains constant along radials and moreover it is independent of any other parameter of the problem exceptR0. Further, it is shown thatum/U0α1/(r/d), the proportionality factor being a function of Π and θ. This function was derived semi-empirically and was shown to be a reasonable description of the experiments.

ISSN:0022-1686    

DOI:10.1080/00221687609499685

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

The C.F.M. has been shown to be a useful modification to existing salt velocity methods of flow measurement. The advantages over more traditional techniques can be summarised as follows.

ISSN:0022-1686    

DOI:10.1080/00221687609499686

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

The oscillatory flow near the sea bed under a wave motion is always rough turbulent in a coastal zone. This type of an oscillatory boundary layer (or “wave boundary layer”) was therefore chosen as a subject for detailed velocity measurements, from which characteristics such as shear stresses, eddy viscosities, energy loss, and boundary layer thickness were determined.

ISSN:0022-1686    

DOI:10.1080/00221687609499687

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Based on the one-dimensional long wave equations a discussion of the physics underlying the tide-induced mass transport in lagoons is presented. It follows from the dynamic equation that the bottom stress associated with the mass transport serves to balance the gradient of the radiation stress and the net bottom stress associated with the (tidal) waves. The mass transport is at best of 0(a/h) (a= tidal amplitude,h= depth).

ISSN:0022-1686    

DOI:10.1080/00221687609499688

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Analytical relations are derived for the wavelength of rolling-grain ripples formed by the action of water waves. Experiments with a tray of sediment oscillated in a tank of still water are reported.The results appear to confirm the theoretical relation obtained for very mobile sediments.

ISSN:0022-1686    

DOI:10.1080/00221687609499689

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

ADVANCED FLUID MECHANICSan introduction by A. J. RAUDKIVI and R. A. CALLANDER, Published by Edward Arnold (Publishers) Ltd., 1975, 25 Hill Street, London W1X 8LL. Price £ 12.00 net.

ISSN:0022-1686    

DOI:10.1080/00221687609499690

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221687609499691

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221687609499682

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor