Air entrapment in a Roman dropshaft at large flow
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- Опубликовано: 16 ноя 2024
- 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 (Q = 67 L/s, Regime R3, Chanson 2004). Detailed air-water flow measurements were conducted for that flow rate (Chanson 2007). The video movie provides details of the plunge pool. (right) and outflow conduit (left), with the flow direction from the top right to bottom left.
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).
