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MULTIMEDIA LIBRARY |
GEOPHYSICAL HYDRAULICS |
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FLUVIAL HYDRAULICS
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MULTIMEDIA LIBRARY |
GEOPHYSICAL HYDRAULICS |
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FLUVIAL HYDRAULICS
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(hj_01.wmv - 360 KB) |
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The transition from a
supercritical flow to a subcritical flow is called a hydraulic jump. A
hydraulic jump is extremely turbulent. It is characterised by the
development of large-scale turbulence, surface waves and spray, energy
dissipation and air entrainment (Chanson 2004, Chanson and Brattberg
2000). The large-scale turbulence region is usually called the 'roller'.
A The flow within a hydraulic jump is extremely complicated and it is not required usually to consider its fine details. To evaluate the basic flow properties and energy losses in such a region, the momentum principle is used (Chanson 2004). The video shows a hydraulic jump in a 0.5 m wide channel located in the Gordon McKay Hydraulics Laboratory of the University of Queensland. The waters flow from left to right and the inflow Froude number is about 9 to 10. |
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Video taken of Dr Hubert Chanson, Civil Engineering, The University of Queensland, Australia in 2001. All coyrights reserved.
Reference: CHANSON, H. (2004). "The Hydraulics of Open Channel Flows :
An Introduction." Butterworth-Heinemann, Oxford, UK, 2nd edition, 630
pages (ISBN 0 7506 5978 5). |