Loading...
Search for:
hydraulics---hydrodynamics
0.003 seconds
Oblique rectangular sharp-crested weir
, Article Proceedings of the Institution of Civil Engineers: Water and Maritime Engineering ; Volume 156, Issue 2 , 2003 , Pages 185-191 ; 14724561 (ISSN) ; Vatannia, Z ; Ghodsian, M ; Jalili, M. R ; Sharif University of Technology
ICE Publishing
2003
Abstract
Among discharge flowmeters, the rectangular sharp-crested weir is one of the most popular and accurate, as well as being easy to work with. Using the standard weir, with the help of the conventional weir equation and Rehbock's or a similar standard formula for the discharge coefficient (Cd), the flow can be easily calculated. In order to increase the efficiency of the weir, it can be placed obliquely to the flow, increasing the effective weir length (L) and, hence, increasing the discharge for the same water head with the same channel width (B). The results of a comprehensive set of tests for oblique weirs (1·14 ≤ L/B ≤ 2·26 or oblique angles from 29° to 64°) show that for L/B less than 1·41...
Hydraulic performance of labyrinth side weirs using vanes or piles
, Article Proceedings of the Institution of Civil Engineers: Water Management ; Volume 164, Issue 5 , 2011 , Pages 229-241 ; 17417589 (ISSN) ; Borghei, S. M ; Esmaili, H ; Sharif University of Technology
Abstract
In the present study, methods for improving the hydraulic performance of labyrinth side weirs in a rectangular channel are reported based on model experimentation. For this purpose different arrangements and configurations of groups of guide vane plates and piles in the side weir flow field were tested. Experiments were conducted on labyrinth side weirs of different lengths and sill heights fitted in the test section of a rectangular glass-walled channel. Depths of flow were measured in both longitudinal and crosswise directions at regular intervals and their profiles were studied. It was found that the discharge coefficient of the labyrinth side weirs under these conditions gave...
Two-dimensional model for lateral intake flows
, Article Proceedings of the Institution of Civil Engineers: Water Management ; Volume 158, Issue 4 , 2005 , Pages 141-150 ; 17417589 (ISSN) ; Taher Shamsi, A ; Sadeghi Bagheney, M ; Mohamadian, A ; Sharif University of Technology
ICE Publishing
2005
Abstract
This paper gives details of the refinement and application of a two-dimensional horizontal model for rivers. An explicit finite-difference algorithm was used for solving the governing differential equations, which includes the conservation of mass and momentum to predict hydrodynamic parameters. The model includes different turbulence closure models - that is, constant eddy viscosity, Prandtl simple mixing length and Smagorinsky methods. An experimental programme was designed and carried out in a laboratory flume to measure the length of eddy produced at the entrance of the intake. Model predictions have been compared with experimental results for a lateral intake. The effect of different...
Influence of unsteady flow hydrograph shape on local scouring around bridge pier
, Article Proceedings of the Institution of Civil Engineers: Water Management ; Volume 165, Issue 9 , October , 2012 , Pages 473-480 ; 17417589 (ISSN) ; Kabiri-Samani, A ; Banihashem, S. A ; Sharif University of Technology
ICE Pub
2012
Abstract
Accurate estimation of scour depth is needed for economic and safe determination of bridge pier foundation depth. Most design criteria are based on maximum scour depth due to the steady design discharge without flow time limit. In this paper, the results are presented of an experimental investigation on local scouring around a single bridge pier under steady and unsteady flow regimes. For unsteady flow, triangular shape hydrographs with repeatable peaks have been chosen. Results show that both sharp and flat increases to the peak of hydrographs have a negligible effect on scour depth for the same base time. An equation is obtained to compute the scour depth due to a specific triangular...
Effect of strain path change on mechanical properties and final microstructure of Cu-Al2O3 in equal channel angular pressing
, Article Materials Science and Technology (United Kingdom) ; Volume 29, Issue 2 , 2013 , Pages 210-218 ; 02670836 (ISSN) ; Serajzadeh, S ; Akhgar, J. M ; Kamankesh, A ; Sharif University of Technology
2013
Abstract
In the present work, the process of equal channel angular pressing of dispersion strengthened Cu-1̇1 wt-%Al2O3 containing nanometric alumina particles was investigated by means of mathematical modelling and experimental testing. Through the modelling, deformation parameters such as hydrostatic pressure distribution and strain field were determined, and the effect of deformation path on these parameters was estimated. Equal channel angular pressing as well as mechanical and microstructural evaluations were also conducted to assess mechanical properties, grain structure and void volume fraction after deformation in different routes. The results indicate that distributions of plastic strain and...
Study on effect of residual stress distributions on kinetics of static strain aging after cold rolling
, Article Materials Science and Technology ; Volume 27, Issue 11 , 2011 , Pages 1620-1626 ; 02670836 (ISSN) ; Serajzadeh, S ; Sharif University of Technology
Abstract
In the present research, the effect of residual stress distribution on the static strain aging (SSA) phenomenon in cold rolled steel was investigated. A three-dimensional model was employed to evaluate the residual stress distributions within the rolled strips, and hole drilling experiments were also performed to verify the data obtained from the mathematical model. Hardness and tensile tests were then performed on the cold rolled samples at different temperatures and aging periods, and the results of these tests were utilised to assess SSA behaviour after different rolling programs. The results show that SSA occurs within the cold rolled steel in the employed aging period, and its kinetics...
Kinetics of static strain aging after temper rolling of low carbon steel
, Article Ironmaking and Steelmaking ; Volume 38, Issue 4 , 2011 , Pages 314-320 ; 03019233 (ISSN) ; Serajzadeh, S ; Sharif University of Technology
Abstract
In this study, static strain aging behaviour of cold rolled steel strips was considered with emphasis on the distribution of residual hydrostatic stress developed during temper rolling. In order to assess residual stress distribution produced by the temper rolling, a three-dimensional model was first employed. Then, samples were rolled at a reduction of 4% under single and double pass rolling programmes and the kinetics of static strain aging phenomenon as well as the required activation energies were then evaluated using hardness and tensile tests on the deformed samples. Considering the predicted residual hydrostatic stress distribution, it was found that tensile hydrostatic stresses...