TY  - JOUR
A1  - Valero, Daniel
A1  - Bung, Daniel B.
T1  - Development of the interfacial air layer in the non-aerated region of high-velocity spillway flows: Instabilities growth, entrapped air and influence on the self-aeration onset
JF  - International Journal of Multiphase Flow
N2  - 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.
Y1  - 2016
U6  - http://dx.doi.org/10.1016/j.ijmultiphaseflow.2016.04.012
SN  - 0301-9322
VL  - 84
SP  - 66
EP  - 74
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Valero, Daniel
A1  - Bung, Daniel B.
T1  - Interfacial velocity estimation in highly aerated stepped spillway flows with a single tip fibre optical probe and Artificial Neural Networks
T2  - 6th IAHR International Junior Researcher and Engineer Workshop on Hydraulic Structures, May 30th to June 1st 2016. Lübeck, Germany
N2  - 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.
Y1  - 2016
U6  - http://dx.doi.org/10.15142/T3Q590
ER  - 
TY  - CHAP
A1  - Valero, Daniel
A1  - Bung, Daniel B.
A1  - Crookston, B. M.
A1  - Matos, J.
ED  - Crookston, B.
ED  - Tullis, B.
T1  - Numerical investigation of USBR type III stilling basin performance downstream of smooth and stepped spillways
BT  - Session 1: Hydraulic structures
T2  - Hydraulic Structures and Water System Management. 6th IAHR International Symposium on Hydraulic Structures, Portland, OR, 27-30 June 2016
Y1  - 2016
SN  - 978-1-884575-75-4
U6  - http://dx.doi.org/10.15142/T340628160853
SP  - 635
EP  - 646
ER  - 
TY  - CHAP
A1  - Valero, Daniel
A1  - Bung, Daniel B.
A1  - Oertel, M.
ED  - Dewals, Benjamin
T1  - Turbulent dispersion in bounded horizontal jets : RANS capabilities and physical modeling comparison
T2  - Sustainable Hydraulics in the Era of Global Change : Proceedings of the 4th IAHR Europe Congress (Liege, Belgium, 27-29 July 2016)
Y1  - 2016
SN  - 978-1-138-02977-4
SN  - 978-1-4987-8149-7 (eBook)
U6  - http://dx.doi.org/10.1201/b21902-13
SP  - 49
EP  - 55
PB  - CRC Press
ER  - 
TY  - CHAP
A1  - Winkler, Norbert
T1  - Vermessung
T2  - Zahlentafeln für den Baubetrieb
Y1  - 2016
SN  - 978-3-658-02838-1 (Online)
SN  - 978-3-658-02837-4 (Print)
U6  - http://dx.doi.org/10.1007/978-3-658-02838-1_3
SP  - 159
EP  - 177
PB  - Springer Vieweg
CY  - Wiesbaden
ET  - 9., überarb. und aktual. Aufl.
ER  -