Study On Oil-water Two-phase Flow Characteristics In Serpentine Channel

Aiming at the oil-water two-phase flow characteristic problems in the serpentine channel, firstly, we carry the numerical simulation to initially understand the oil-water two-phase flow, and then, design the mini-conductance array probes and parallel wire conductivity probes measurement method to detect the flow pattern and volume fraction of the oil-water two-phase flow in the serpentine channel, analyze the conductance signals of parallel wire conductivity probe, study the flow characteristics of the oil-water two-phase flow using nonlinear analysis, extracted the volume fraction at different locations of the serpentine channel, and achieve the following conclusions:1. We use the CFD method to simulate the stratified flow and dispersed flow of the oil-water two-phase flow in the serpentine channel. The results show that regarding the stratified flow, the oil phase accumulates, and the holdup of water is small in the ascent part; the water phase accumulates ,and the holdup of water is big; the holdup of water transits from small to big on the top of the serpentine channel. Regarding the dispersed flow, each phase is scattered, when volume fraction is less than 20% or greater than 80%, a clearer oil boundary or blister boundary can be observed, which means the simulation of the dispered flow is better.2. We conduct a oil-water two-phase flow dynamic experiment in the serpentine channel. Different two phase flows have different output signal waveforms. So, flow patterns can be identified through the different conductance fluctuating signals of the parallel wire conductivity probes. Based on the experimental observation and the analysis of the probe signals, we can conclude that the results of experiment and CFD simulation are very similar and consistent, and the CFD simulation has been proven to be reliable for the research of the oil-water two-phase flow. Also, parallel wire conductivity probe is proved to be sensitive to the changes of the oil-water two-phase flow, so it can be used for the study of oil-water two-phase flow.3. We study the oil-water two-phase flow by the method of chaotic attractor morphological description, classify the different flow patterns by the attractor morphological characteristic quantity in two dimensions. The results show that the method of attractor morphological description has a good identification of two-phase flow patterns.4. Base on the different conductance fluctuating signals of the parallel wire conductivity probes, we summarize the different methods of the volume fraction measurement, and extract the volume fraction at the different positions of the channel.