摘要:

The results of an experimental study on the motion of heavy particles (heavierthan water) in an open channel flow over a smooth bed are presented in the paper. Some aspects of the diffusion and dispersion of the particles are analysed and especially the effects of lift force and the quadratic nature of drag forces when present. The results show that for a given fall velocity in still water, the vertical dispersion increases with increase in particle diameter. Measured mean particle downward velocities are lower than the settling velocities in still water.

ISSN:0022-1686    

DOI:10.1080/00221688509499373

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

The hydraulic jump in rectangular, horizontal and non-prismatic channels is analysed. Distinction is made between the cases in which flow is non-separated and separated from the channel side-walls, respectively. Results include a rational prediction of the sequent depth ratio in terms of the inflow Froude number and the channel width ratio, the relative energy dissipation and the length characteristics of the roller and the jump. Results are presented in terms of design quantities which enables a direct and simple application in hydraulic practice.

ISSN:0022-1686    

DOI:10.1080/00221688509499374

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

The paper analyses experimental data on resistance to flow in smooth channels of circular cross-section. The results of the tests showed that the measured friction factors are larger than those for a pipe of equivalent diameter (D− 4R). Through the analysis of the data for the range of flow depths 0 <y< 0.85D, the geometric parametery/Phas been found more appropriately representing the shape effects on resistance to flow in circular channels than using a single parameter like the hydraulic mean radius,R.

ISSN:0022-1686    

DOI:10.1080/00221688509499375

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

This paper presents the results ofan experimental study on the near-field diffusion of bluff buoyant turbulent surface jets with small (source) Richardson number in a large body of water without any ambient currents. It has been found that the velocity scale decreases inversely with the axial distance x from the outfall whereas the vertical and surface length scaleshandbgrow linearly withx. The variation of the coefficients in the relations for these scales, with the source Richardson number has been evaluated using the experimental observations.

ISSN:0022-1686    

DOI:10.1080/00221688509499376

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

Recent research activities at the Delft Hydraulics Laboratory and the Delft University of Technology have increased the understanding of the large-scale bed deformation in alluvial rivers with relatively stable banks. In this paper the most important results of these activities are given.

ISSN:0022-1686    

DOI:10.1080/00221688509499377

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221688509499372

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor