Related Experiment Video
Updated: Mar 28, 2026

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
Published on: August 30, 2012
Pattern transitions of oil-water two-phase flow with low water content in rectangular horizontal pipes probed by
Abstract:
The flow-pattern transition has been a challenging problem in two-phase flow system. We propose the terahertz time-domain spectroscopy (THz-TDS) to investigate the behavior underlying oil-water flow in rectangular horizontal pipes. The low water content (0.03-2.3%) in oil-water flow can be measured accurately and reliably from the relationship between THz peak amplitude and water volume fraction. In addition, we obtain the flow pattern transition boundaries in terms of flow rates. The critical flow rate Qc of the flow pattern transitions decreases from 0.32 m3 h to 0.18 m3 h when the corresponding water content increases from 0.03% to 2.3%. These properties render THz-TDS particularly powerful technology for investigating a horizontal oil-water two-phase flow system.
Related Concept Videos
Design Example: Flow of Oil Through Circular Pipes
UV–Vis Spectroscopy: Molecular Electronic Transitions
Turbulent Flow
General Characteristics of Pipe Flow II
The distance to reach a fully developed flow is called the entrance length and depends on the...
General Characteristics of Pipe Flow I
The classification of fluid...
IR Frequency Region: X–H Stretching

