Refine
Year of publication
- 2016 (35) (remove)
Document Type
- Part of a Book (14)
- Article (8)
- Conference Proceeding (7)
- Book (4)
- Report (2)
Keywords
- Brandfall (1)
- EN 1993-1-2 (1)
- Forschung, pränormativ (1)
- Tragwerksbemessung (1)
- building industry (1)
- energy disspation (1)
- friction (1)
- industrial research (1)
- ingot (1)
- iron and steel industry (1)
- materials technology (1)
- metal structure (1)
- research project (1)
- research report (1)
- resistance of materials (1)
- steel (1)
- structural design (1)
- wave run-up (1)
Institute
- Fachbereich Bauingenieurwesen (35) (remove)
Self-aeration is traditionally explained by the water turbulent boundary layer outer edge intersection with the free surface. This paper presents a discussion on the commonly accepted hypothesis behind the computation of the critical point of self-aeration in spillway flows and a new formulation is proposed based on the existence of a developing air flow over the free surface. Upstream of the inception point of self-aeration, some surface roughening has been often reported in previous studies which consequently implies some entrapped air transport and air–water flows coupling. Such air flow is proven in this study by presenting measured air velocities and computing the air boundary layer thickness for a 1V:2H smooth chute flow. Additionally, the growth rate of free surface waves has been analysed by means of Ultrasonic Sensors measurements, obtaining also the entrapped air concentration. High-speed camera imaging has been used for qualitative study of the flow perturbations.
Air-water flows can be found in different engineering applications: from nuclear engineering to huge hydraulic structures. In this paper, a single tip fibre optical probe has been used to record high frequency (over 1 MHz) phase functions at different locations of a stepped spillway. These phase functions have been related to the interfacial velocities by means of Artificial Neural Networks (ANN) and the measurements of a classical double tip conductivity probe. Special attention has been put to the input selection and the ANN dimensions. Finally, ANN have shown to be able to link the signal rising times and plateau shapes to the air-water interfacial velocity.
Turbulent dispersion in bounded horizontal jets : RANS capabilities and physical modeling comparison
(2016)
Vermessung
(2016)