Showing posts with label skimming flow. Show all posts
Showing posts with label skimming flow. Show all posts

Sunday, 12 February 2023

Two New Equations for Energy Dissipation down a Stepped Spillway with Channel Slopes between 3.4∘ and 26.6∘ | Chapter 2 | Techniques and Innovation in Engineering Research Vol. 8

 A skipped spillway is a hydraulic building provided at storage and confinement dams to release flood water that cannot be retained harmlessly in reservoirs. Its purpose is to increase the strength dissipation that would have caused hazardous scour in the everyday channel below the hydraulic makeup. Several studies in the literature highlight the hurtful effects of the moving power of water falling on the type water channel. However, only a few of these studies considered the impact of strength losses developing from stepped spillways accompanying channel slopes of 3.4∘ and 26.6∘. Additionally, the existing model for predicting strength dissipation in danced spillways features a limit, the friction factor, f, that is difficult to estimate absolutely, thereby bestowing rise to its emotional estimation by those complicated with the design of treaded spillways. The authors resolve these issues by reviewing researchers' advertisements on horizontal tiptoed spillways with dam slopes 'tween 3.4∘ ≤ � ≤ 26.6∘ conducted in transition and grazing flows in large-diameter facilities accompanying phase-detection obtrusive probes. They obtain dossier sets from them, that they reanalyzed to develop two new energy disappearance models without the limit, f (the frictional factor) that govern change and skimming flows over a off-course range of operating conditions. The dossier sets from these new models compare favourably with the calculated data sets, accompanying coefficients of correlation varying from 0.95 to 0.99. These models are simple to use and produce more accurate results than the current model.

Author(s) Details:

Okechukwu Ozueigbo,
Department of Civil Engineering, Faculty of Engineering, University of Nigeria, Nsukka, Nigeria.

J. C. Agunwamba,
Department of Civil Engineering, Faculty of Engineering, University of Nigeria, Nsukka, Nigeria.

Please see the link here: https://stm.bookpi.org/TAIER-V8/article/view/9384

Friday, 14 October 2022

Flow Characteristics of Skimming Regime Flow over Stepped Spillways with Attention to Optimum Step Size | Chapter 3 | Current Overview on Science and Technology Research Vol. 6

 With an overflow chute, the stepped design increases the energy dissipation rate of the slide itself and reduces the size of the downstream energy dissipator. Here, a study was conducted to better understand the flow behavior in a stepped chute with scraper flow. In this work, we used different experimental setups and large-scale models previously obtained from other researchers. The current results lead to a new practical design method for step overflow with scoop flow. The design methodology includes several important aspects not foreseen in previous studies. The results apply to a variety of downcomer geometries and flow conditions typical of embankment slides. A step channel hydraulic layout drawing is provided. From these figures, the optimal number of stages is determined for maximum energy dissipation, allowing the size of downstream energy dissipators to be reduced. The method provides parameters such as the optimal number of stages, typical flow depth, average velocity at the edge of the stepped channel, sidewall height, and distillation tank type to maximize energy dissipation. Easy to implement for designers who want to


Author(s) Details:

Farzin Salmasi,
Department of Water Engineering, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.

John Abraham,
School of Engineering, 2115 Summit Avenue St. Paul, University of St. Thomas, Minnesota - 55105, USA.

Please see the link here: https://stm.bookpi.org/COSTR-V6/article/view/8413