Water surface topology of supercritical junction flow

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The complexity of flow conditions at junctions amplifies significantly with supercritical flow. It is a pronounced three-dimensional two-phased flow phenomenon, where standing waves with non-stationary water surface are formed. To analyse the hydrodynamic conditions at an asymmetric right-angled junction with incoming supercritical flows at Froude numbers between 2 and 12, an experimental approach was used. For a phenomenological determination of the relations between the integral parameters of incoming flows and the characteristics of standing waves at the junction area, water surface topographies for 168 scenarios at the junction were measured using non-intrusive measurement techniques. The new, phenomenologically derived equations allow for determination of location, height and extent of the main standing waves at the junction. Research results give important information on the processes and their magnitude for engineering applications.

Behlke, C.E., Pritchett, H.D., 1966. The design of supercritical channel junction. Highway Research Record, 133, 17–35.

Best, J., Reid, I., 1984. Separation zone at open channel junction. J. Hydraul. Eng., 110, 11, 1588–1594.

Bowers, C.E., 1950. Studies of open channel junctions. Project Report 24. Part V. Hydraulic model studies for Whiting Field Naval Air Station. University of Minnesota, St. Anthony Falls Hydraulic Laboratory, Minneapolis.

Chachereau, Y., Chanson, H., 2010. Free-surface fluctuations and turbulence in hydraulic jumps. Exp. Therm. Fluid Sci., 35, 6, 896–909.

Christodoulou, G.C., 1993. Incipient hydraulic jump at channel junction. J. Hydraul. Eng., 119, 3, 409–423.

Greated, C.A., 1968. Supercritical flow through junctions. La Houille Blanche, 23, 3, 693–695.

Hager, W.H., 1989a. Supercritical Flow in Channel Junctions. J. Hydraul. Eng., 115, 5, 595–616.

Hager, W.H., 1989b. Transitional Flow in Channel Junctions. J. Hydraul. Eng., 115, 2, 243–259.

Hager, W.H., 2010. Wastewater Hydraulics: Theory and Practice. 2nd Edition. Springer Verlag, Heidelberg, Berlin.

Mignot, E., Riviere, N., Perkins, R., Paquier, A., 2008. Flow patterns in a four-branch junction with supercritical flow. J. Hydraul. Eng., 134, 6, 701–713.

Murzyn, F., Chanson, H., 2008. Experimental assessment of scale effects affecting two-phase flow properties in hydraulic jumps. Exp. Fluids., 45, 3, 513–521.

Murzyn, F., Chanson, H., 2009. Free-surface fluctuations in hydraulic jumps: Experimental observations. Exp. Therm. Fluid Sci., 33, 7, 1055–1064.

Peakall, J., Warburton, J., 1996. Surface tension in small hydraulic river models – the significance of the Weber number. J. Hydrol., 35, 2, 199–212.

Pfister, M., Chanson, H., 2014. Two-phase air-water flows: Scale effects in physical modelling. J. Hydrodyn. Ser. B, 26, 2, 291–298.

Pfister, M., Gisonni, C., 2014. Head losses in junction manholes for free surface flows in circular conduits. J. Hydraul. Eng., 140, 9, 1–6.

Pinto Coelho, M.M., 2015. Experimental determination of free surface levels at open-channel junction. J. Hydraul. Res., 53, 3, 394–399.

Rak, G., 2017. Topološka struktura vodne gladine na sotočju pri deročem toku (Water surface topology of supercritical confluence flow). Doctoral dissertation, University of Ljubljana, Faculty of Civil and Geodetic Engineering, 112 p. (in Slovene, with English captions and extended summary). https://repozitorij.uni-lj.si/IzpisGradiva.php?id=99202&lang=eng

Rak, G., Steinman, F., Hočevar, M., 2017. Measuring water surface topography using laser scanning. Flow Meas. Instrum., 56, 35–44.

Rak, G., Hočevar, M., Steinman, F., 2018. Construction of water surface topography using LIDAR data. Stroj. Vestn.-J. Mech. E., 64, 1–11.

Saldarriaga, J., Rincon, G., Moscote, G., Trujillo, M., 2017. Symmetric junction manholes under supercritical flow conditions. J. Hydraul. Res., 53, 3, 135–142.

Schwalt, M., Hager, W.H., 1995. Experiments to supercritical junction flow. Exp. Fluids, 18, 429–437.

Journal of Hydrology and Hydromechanics

The Journal of Institute of Hydrology SAS Bratislava and Institute of Hydrodynamics CAS Prague

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