Wireless Self‐Powered Triboelectric‐Based Sensor for Real‐Time Quantitative Monitoring of Gas‐Liquid Mixed Flow

ABSTRACT Wireless flow sensing technologies have attracted significant interest for enabling safe operation and performance optimization in gas‐liquid two‐phase flow systems. Nevertheless, the real‐time quantitative monitoring of liquid flow rates without phase separation remains a considerable challenge. In this work, we present a wireless, self‐powered, and real‐time quantitative liquid flow measurement system utilizing a gas‐liquid electricity generator (GLEG) based on the triboelectric effect. The GLEG features a dual‐electrode configuration consisting of an external ring electrode and an internal porous electrode, which efficiently harvests mechanical energy from high‐speed continuous gas‐liquid mixed flow and converts it into usable electrical power. By integrating a sensor circuit board with a power regulation module, a microcontroller unit, and wireless transmission components, we demonstrate a fully self‐sustained sensing system capable of real‐time quantitative monitoring in gas‐liquid mixed flow environments. Under continuous flow conditions with an air pressure of 0.6 MPa and flow speed of 30 m/s, the system achieves real‐time measurement of liquid flow rates in the range of 0–90 mL/min with an accuracy of 95%. This triboelectric nanogenerator‐based wireless sensing platform offers a promising approach for in situ parameter analysis and measurement in multiphase flow systems.