Measurement of Bubble Size Distributions with Wire-Mesh Sensors


Measurement of Bubble Size Distributions with Wire-Mesh Sensors

Prasser, H.-M.; Zippe, C.

The presented wire-mesh sensor produces sequences of instantaneous gas fraction distributions in a cross section with a time resolution of 1200 frames per second and a spatial resolution of about 2-3 mm. At moderate flow velocities (up to 1-2 m/s), bubble size distributions can be obtained, since each individual bubble is mapped in several successive distributions. The method was used to study the evolution of the bubble size distribution in a vertical two-phase flow. In order to assess the accuracy of the described method, a transparent flow channel with an integrated wire-mesh sensor was built. The interaction of gas bubbles with the electrode wires was visually observed. A high-speed video camera was used to record the contact of bubbles with the sensor. The video sequences are compared with the synchronously recorded sensor data. Conclusions are drawn concerning the distortion of the flow by the sensor and the accuracy of the measured gas fractions and bubble size distributions.

Keywords: two-phase flow; measuring technique; wire-mesh sensor; transient flow; bubble size distribution; high-speed

  • Lecture (Conference)
    5th German/Japanese Symposium "Bubble Columns", Dresden, May 28 - 30, 2000
  • Contribution to proceedings
    5th German/Japanese Symposium "Bubble Columns", Dresden, May 28 - 30, 2000

Permalink: https://www.hzdr.de/publications/Publ-3303
Publ.-Id: 3303