Details

Autor(en) / Beteiligte

• Han, Y.F.
• Jin, N.D.
• Yin, Z.Q.
• Ren, Y.Y.
• Gu, Y.

Titel

Measurement of oil bubble size distribution in oil-in-water emulsions using a distributed dual-sensor probe array

Ist Teil von

• Experimental thermal and fluid science, 2017-09, Vol.86, p.204-223

Ort / Verlag

Philadelphia: Elsevier Inc

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •We design a distributed dual-sensor array for measuring local flow characteristics in emulsions.•We implement an experiment of pipeline flow of emulsions with low velocity and high water-cut.•We extract and compare oil bubble size distributions on different positions at the pipe cross section.•We investigate the instability in the motion of bubbles with multi-scale cross entropy. The scope of the present study is to experimentally investigate the oil bubble size distribution in oil-in-water emulsions. The geometry parameter of a dual-sensor probe is firstly optimized through examining its electrical field distribution and sensitivity. Afterward, an eight-channel distributed dual-sensor probe array is designed for a pipe with 20mm inner diameter (ID) to measure the local holdup, bubble velocity as well as bubble size of the dispersed oil phase in oil-in-water emulsions under low mixture velocity and high water-cut. The results indicate that the changes in mixture velocity and water-cut substantially affect the oil bubble size distribution on different positions at the pipe cross section. With the extraction of the increasing rate regarding multi-scale cross entropy (MSCE) from the fluctuating signals from the leading and rear sensor of the dual-sensor probe, the dynamic instability in the motion of oil bubbles is analyzed. It proves that the multi-scale cross entropy can be an effective indicator on globally characterizing the nonlinear dynamics in oil-in-water emulsions at the pipe cross section.