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A new strategy for tube leakage and blockage detection using bubble motion-based solid-liquid triboelectric sensor

Science China(Technological Sciences) 2022年第2期65卷 282-292页

作者： ZHANG XiaoLong DONG Yang XU Xiang QIN HongLing WANG DaoAi Hubei Key Laboratory of Hydroelectric Machinery Design&Maintenance China Three Gorges UniversityYichang 443002China State Key Laboratory of solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Qingdao Center of Resource Chemistry and New Materials Qingdao 266100China

Exploring a rapid, reliable, and practical means to detect blockages and leakages in liquid pipelines and accurately locate their positions is of great importance in practical engineering applications. Here, we report a bubble motion-based triboelectric sensor(BM-TES) for detecting and locating the blockages and leaks inside a plastic tube. This simple-designed, environment-friendly,non-damaging sensor is composed of several ring-shaped Cu electrodes distributed on a polytetrafluoroethylene tube. The selfpowered movement of the bubble under the action of buoyancy makes the inner wall of the tube change from the original solidliquid phase to the gas-solid-liquid phase, which results in a short-term contact and separation between the liquid and the wall.Based on the fractional triboelectric effect of the liquid-solid contact, an obvious real-time stable voltage peak will be generated where the detection bubble passes. The obvious peaks of the open-circuit voltage with respect to time correspond with the electrode distribution. Then, the peaks can be utilized as a robust and sensitive indicator for detecting blockage and leakage, as the number of obvious peaks of the open-circuit voltage is directly related to the blockage and leakage location. The blockage and leakage in a fluid tube were successfully detected using the BM-TES with an accuracy of 10 cm. In addition, the BE-TES was able to detect the water flow velocity in the pipe. The experimental results showed that BM-TES can provide a new strategy and method for liquid tube monitoring and has great potential application value in related fields.

关键词： solid-liquid triboelectric self-powered bubble blockage leakage

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