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2 Publications

Hydraulic jump in a closed horizontal two-phase flow channel

Vallee, C.

The hydraulic jump in a co-current two-phase flow was investigated in the Horizontal Air/Water Channel (HAWAC) of Forschungszentrum Dresden-Rossendorf. The hydraulic jump is the discontinuous transition between super- and subcritical flow and is characterised by a steep rising of the water surface with high turbulence production.
High-speed video observations were performed in the channel and an algorithm was developed to recognise the interface in the camera frames. This allows a water level measurement in any cross-section. Since the interface is very dynamic due to the high turbulence in the jump, a statistical approach is proposed in order to reflect the structure of the interface over the time. The probability distribution of the water levels was calculated in each vertical cross-section and is shown in pictures of the test-section.
Furthermore, experiments were performed to point out the influence of the air flow rate on the hydraulic jump in a closed channel. Due to the momentum exchange between the phases, the position of the hydraulic jump from the inlet increases sensibly with the air flow rate. Moreover, an increasing smearing of the probability distributions was observed with higher air flow rate. This indicates that the oscillations of the interface are increasing with the air flow rate, which can be attributed to the flow regime downstream of the hydraulic jump, in particular to the transition to slug flow.

Keywords: hydraulic jump; stratified two-phase flow; horizontal channel

  • Contribution to proceedings
    International Conference on Multiphase Flow 2007, 09.-13.07.2007, Leipzig, Germany
    Paper N° S5_Fri_A_63
  • Lecture (Conference)
    International Conference on Multiphase Flow 2007, 09.-13.07.2007, Leipzig, Germany

Publ.-Id: 9506