Air entrainment in a Roman dropshaft at large flow
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- Опубліковано 29 січ 2025
- A dropshaft is an energy dissipator connecting two channels with a drop in invert elevation. It is an ancient design: e.g., the dropshaft cascades along Roman aqueducts. In modern times, dropshafts are commonly used in sewers, storm-water systems, and downstream of culverts, while large spillway shafts were built. This movie presents the operation of full-scale Roman dropshaft in the Hydraulics Laboratory of the University of Queensland (Prototype P2, Chanson 2004). The shaft operated at some large flow (Regime R3, Chanson 2004). Detailed air-water flow measurements were conducted for that flow rate (Chanson 2007).
Bibliography
CHANSON, H. (2000). "Hydraulics of Roman Aqueducts : Steep Chutes, Cascades and Dropshafts." American Journal of Archaeology, Vol. 104, No. 1, Jan., pp. 47-72 (DOI: 10.2307/506792).
CHANSON, H. (2002). "An Experimental Study of Roman Dropshaft Hydraulics." Journal of Hydraulic Research, IAHR, Vol. 40, No. 1, pp. 3-12 (DOI: 10.1080/00221680209499868).
CHANSON, H. (2003). "Experimental Investigation of Dropshaft Hydraulics: Two-Phase Flow and Acoustics." Proc. 30th IAHR Biennial Congress, Thessaloniki, Greece, J. GANOULIS and P. PRINOS Ed., Vol. B, pp. 353-360 (ISBN 960-243-594-1).
CHANSON, H. (2004). "Hydraulics of Rectangular Dropshafts." Journal of Irrigation and Drainage Engineering, ASCE, Vol. 130, No. 6, pp. 523-529 (DOI: 10.1061/(ASCE)0733-9437(2004)130:6(523)).
CHANSON, H. (2004). "Understanding Air-Water Mass Transfer at Rectangular Dropshafts." Journal of Environmental Engineering and Science, NRC, Vol. 3, No. 5, pp. 319-330 (DOI: 10.1139/s04-014).
CHANSON, H. (2007). "Air Entrainment Processes in Rectangular Dropshafts at Large Flows." Journal of Hydraulic Research, IAHR, Vol. 45, No. 1, pp. 42-53 (DOI:10.1080/00221686.2007.9521742).
GUALTIERI, C., and CHANSON, H. (2013). "Interparticle Arrival Time Analysis of Bubble Distributions in a Dropshaft and Hydraulic Jump." Journal of Hydraulic Research, IAHR, Vol. 51, No. 3, pp. 253-264 (DOI: 10.1080/00221686.2012.762430).
