Experimental and numerical study on bubble behaviour using electrostatic model around wire–mesh sensor

The characteristics and evolution of two-phase flow are of critical importance to the safety of pressurized water reactors. Based on the double-layer wire mesh sensors in this paper, the air-water two-phase flow experiment of the 3×3 rod bundle channels is carried out at room temperature and pressure. The results show that the critical bubble diameter range for the reversal of lateral lift direction is 4 to 5.8 mm. In addition, the time-averaged void fraction for bubbly flow reveals a wall peak distribution at lower superficial gas velocities and shifts to a core peak as these velocities increase. For cap flow, the cross-distribution of cap bubbles within adjacent subchannels triggers large-scale mixing of the liquid phase between adjacent subchannels. For slug flow, large-sized bubbles develop along the axis and cross subchannel gaps to aggregate into slug-shaped bubbles, with a more pronounced distribution of the central peak of void fraction. The drift-flux models are evaluated against the experimental data, and the Ozaki model demonstrates higher precision in estimating void fraction, exhibiting a deviation of 9.8% on average.

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Experimental and numerical study on bubble behaviour using electrostatic model around wire–mesh sensor

Cited by 2 publications

References 27 publications

Gas volume estimation in a vertical pipe flow considering the bubble size obtained from an ultrasonic velocity vector profiler

Gas volume estimation in a vertical pipe flow considering the bubble size obtained from an ultrasonic velocity vector profiler

Study on flow regime characteristics in 3×3 rod bundle channels based on wire mesh sensor

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